The Water Encyclopedia: Hydrologic Data and Internet Resources - Chapter 8 doc

8-1 Section 8B Drinking Water Quality Standards United States.. Rho¨ne since 1987 data refer to another station; DEU Weser: 1990–1997—BOD7 208; NLD Mass-Eijsden 1990and 1993–1994; Rijn-L

Water Quality Katherine L Thalman and James M Bedessem

CONTENTS

Section 8A Water Quality 8-1 Section 8B Drinking Water Quality Standards United States 8-33 Section 8C Drinking Water Standards — World 8-54 Section 8D Municipal Water Quality 8-71 Section 8E Industrial Water Quality 8-105 Section 8F Irrigation Water Quality 8-115 Section 8G Water Quality for Aquatic Life 8-129 Section 8H Recreational Water Quality 8-176 Section 8I Water Quality for Livestock and Aquaculture 8-183 Section 8J Water Treatment Processes 8-189 Section 8K Water Treatment Facilities 8-218

8-1

SECTION 8A WATER QUALITY

Table 8A.1 Summary of Quality Inputs to Surface and Groundwaters

Soluble gases from man’s industrial activitiesParticulate matter from industrial stacks, dust, and radioactive particlesMaterial washed from surface of earth, e.g.,

Organic matter such as leaves, grass, and other vegetation in all stages ofbiodegradation

Bacteria associated with surface debris (including intestinal organisms)Clay, silt, and other mineral particles

Organic extractives from decaying vegetationInsecticide and herbicide residues

(exclusive of industrial) Partially degraded organic matter such as raw wastes from human bodies

Combination of above two after biodegradation to various degrees of sewagetreatment

Bacteria (including pathogens), viruses, worm eggsGrit from soil washings, eggshells, ground bone, etc

Miscellaneous organic solids, e.g., paper, rags, plastics, and synthetic materialsDetergents

Inorganic solids, mineral residuesChemical residues ranging from simple acids and alkalis to those of highly complexmolecular structure

Metal ions

Fertilizer residuesInsecticide and herbicide residuesSilt and soil particles

Organic debris, e.g., crop residueConsumptive use (all sources) Increased concentration of suspended and dissolved solids by loss of water to

atmosphere

Dissolved minerals, e.g.:

Bicarbonates and sulfates of Ca and Mg dissolved from earth mineralsNitrates and chlorides of Ca, Mg, Na and K dissolved from soil and organic decayresidues

Soluble iron, Mn, and F salts

(principally via septic tank Nitrates, sulfates, and other residues of organic decay

systems and seepage from polluted Salts and ions dissolved in the public water supply

Industrial use

(not much direct disposal to soil)

Soluble salts from seepage of surface waters containing industrial wastes

Other materials as per meteorological waters

(not properly installed) Soluble chemical and gaseous products or organic decay

Note: This list includes the types of things that may come from any contributing factor Not all are present in each specific instance.Source: From McGauhey, Engineering Management of Water Quality, McGraw-Hill, Copyright 1968

Table 8A.2 Conditions That May Cause Variations in Water Quality

Runoff during drought—high mineral content, hard, groundwater characteristicsRunoff during floods—less bacteria than snowmelt, may be muddy (depending uponother factors listed below)

Geographic conditions Steep headwater runoff differs from lower valley areas in ground cover, gradients,

transporting power, etc

Organic soils or swamps produce colorCultivated land yields silt, fertilizers, herbicides, and insecticidesFractured or fissured rocks may permit silt, bacteria, etc., to move with groundwaterMineral content dependent upon geologic formations

Dry season yields dissolved saltsIrrigation return water, in growing season onlyCannery wastes seasonal

Aquatic organisms seasonalOverturn of lakes and reservoirs seasonalFloods generally seasonal

Dry period, low flows, seasonalResource management practices Agricultural soils and other denuded soils are productive of sediments, etc (See third

item under Geologic conditions.)Forested land and swampland yield organic debrisOvergrazed or denuded land subject to erosionContinuous or batch discharge of industrial wastes alters shock loadsInplant management of waste streams governs nature of waste

Dissolved oxygen in water varies in some fashionRaw sewage flow variable within 24-hr period; treated sewage variation lesspronounced

Industrial wastes variable—process wastes during productive shift; different materialduring washdown and cleanup

Source: From McGauhey, Engineering Management of Water Quality, McGraw-Hill, Copyright 1968

Constituent Major Sources Concentration in Natural Water Effect upon Usability of Water

Silica (SiO2) Feldspars, ferromagnesium and clay minerals,

amorphous silicachert, opal

Ranges generally from 1.0 to 30 mg/L, although

as much as 100 mg/L is fairly common; asmuch as 4,000 mg/L is found in brines

In the presence of calcium and magnesium,silica forms a scale in boilers and on steamturbines that retards heat; the scale is difficult

to remove Silica may be added to soft water

to inhibit corrosion of iron pipes

Igneous rocks:

Amphiboles, ferromagnesian micas, ferroussulfide (FeS), ferric sulfide or iron pyrite(FeS2), magnetite (Fe3O4)

Generally less than 0.50 mg/L in fully aeratedwater Groundwater having a pH less than 8.0may contain 10 mg/L; rarely as much as

More than 0.1 mg/L precipitates after exposure

to air; causes turbidity, stains plumbingfixtures, laundry and cooking utensils, and

Oxides, carbonates, and sulfides or iron clayminerals

springs, mine wastes and industrial maycontain more than 6,000 mg/L

foods and drinks More than 0.2 mg/L isobjectionable for most industrial uses

2 Man-made sources:

Well casing, piping, pump parts, storagetanks, and other objects of cast iron andsteel which may be in contact with the waterIndustrial wastes

Manganese (Mn) Manganese in natural water probably comes

most often from soils and sediments

Metamorphic and sedimentary rocks andmica biotite and amphibole hornblendeminerals contain large amounts ofmanganese

Generally 0.20 mg/L or less Groundwater andacid mine water may contain more than

10 mg/L Reservoir water that has “turnedover” may contain more than 150 mg/L

More than 0.2 mg/L precipitates upon oxidation;causes undesirable tastes, deposits on foodsduring cooking, stains plumbing fixtures andlaundry and fosters growths in reservoirs,filters, and distribution systems Mostindustrial users object to water containingmore than 0.2 mg/L

aragonite, calcite, dolomite, clay minerals

As much as 600 mg/L in some western streams;

brines may contain as much as 75,000 mg/L

Calcium and magnesium combine withbicarbonate, carbonate, sulfate, and silica toform heat-retarding, pipe-clogging scale inMagnesium (Mg) Amphiboles, olivine, pyroxenes, dolomite,

magnesite, clay minerals

As much as several hundred mg/L in somewestern streams; ocean water contains morethan 1,000 mg/L and brines may contain asmuch as 57,000 mg/L

boilers and in other heat-exchangeequipment Calcium and magnesium combinewith ions of fatty acid in soaps to form soapsuds; the more calcium and magnesium, themore soap required to form suds A highconcentration of magnesium has a laxativeeffect, especially on new users of the supplySodium (Na) Feldspars (albite), clay minerals, evaporates,

such as halite (NaCl) and mirabilite(Na2SO410H2O), industrial wastes

As much as 1,000 mg/L in some westernstreams; about 10,000 mg/L in sea water;

about 25,000 mg/L in brines

More than 50 mg/L sodium and potassium in thepresence of suspended matter causesfoaming, which accelerates scale formation

feldspathoids, some micas, clay minerals 100 mg/L in hot springs; as much as

25,000 mg/L in brines

potassium carbonate in recirculating coolingwater can cause deterioration of wood incooling towers More than 65 mg/L of sodiumcan cause problems in ice manufacture

less than 10 mg/L in groundwater Water high

in sodium may contain as much as 50 mg/L ofcarbonate

Upon heating, bicarbonate is changed intosteam, carbon dioxide, and carbonate Thecarbonate combines with alkaline earths—principally calcium and magnesium—to formBicarbonate

(HCO3)

1,000 mg/L in water highly charged withcarbon dioxide

a crustlike scale of calcium carbonate thatretards flow of heat through pipe walls andrestricts flow of fluids in pipes Watercontaining large amounts of biocarbonate andalkalinity are undesirable in many industriesSulfate (SO4) Oxidation of sulfide ores; gypsum; anhydrite;

industrial wastes

Commonly less than 1,000 mg/L except instreams and wells influenced by acid minedrainage As much as 200,000 mg/L in somebrines

Sulfate combines with calcium to form anadherent, heat-retarding scale More than

250 mg/L is objectionable in water in someindustries Water containing about 500 mg/L

of sulfate tastes bitter; water containing about1,000 mg/L may be cathartic

Chloride (Cl) Chief source is sedimentary rock (evaporates);

minor sources are igneous rocks Ocean tidesforce salty water upstream in tidal estuaries

Commonly less than 10 mg/L in humid regions;

tidal streams contain increasing amounts ofchloride (as much as 19,000 mg/L) as the bay

or ocean is approached About 19,300 mg/L inseawater, and as much as 200,000 mg/L inbrines

Chloride in excess of 100 mg/L imparts a saltytaste Concentrations greatly in excess of

100 mg/L may cause physiological damage.Food processing industries usually requireless than 250 mg/L Some industries—textileprocessing, paper manufacturing, andsynthetic rubber manufacturing—desire lessthan 100 mg/L

Fluoride (F) Amphiboles (hornblende), apatite, fluorite, mica Concentrations generally do not exceed 10 mg/L

in groundwater or 1.0 mg/L in surface water

Concentrations may be as much as1,600 mg/L in brines

Fluoride concentration between 0.6 and1.7 mg/L in drinking water has a beneficialeffect on the structure and resistance to decay

of children’s teeth Fluoride in excess of1.5 mg/L in some areas causes “mottledenamel” in children’s teeth Fluoride in excess

of 6.0 mg/L causes pronounced mottling anddisfiguration of teeth

Constituent Major Sources Concentration in Natural Water Effect upon Usability of Water

Nitrate (NO3) Atmosphere; legumes, plant debris, animal

excrement, nitrogenous fertilizer in soil andsewage

In surface water not subjected to pollution,concentration of nitrate may be as much as5.0 mg/L but is commonly less than 1.0 mg/L

In groundwater the concentration of nitratemay be as much as 1,000 mg/L

Water containing large amount of nitrate (morethan 100 mg/L) is bitter tasting and may causephysiological distress Water from shallowwells containing more than 45 mg/L has beenreported to cause methemoglobinemia ininfants Small amounts of nitrate help reducecracking of high-pressure boiler steelDissolved solids The mineral constituents dissolved in water

constitute the dissolved solids

Surface water commonly contains less than3,000 mg/L; streams draining salt beds in aridregions may contain in excess of

15,000 mg/L Groundwater commonlycontains less than 5,000 mg/L; some brinescontain as much as 300,000 mg/L

More than 500 mg/L is undesirable for drinkingand many industrial uses Less than 300 mg/L

is desirable for dyeing of textiles and themanufacture of plastics, pulp paper, rayon.Dissolved solids cause foaming in steamboilers; the maximum permissible contentdecreases with increases in operatingpressure

Source: From U.S Geological Survey, 1962; amended

Table 8A.4 Relative Abundance of Dissolved Solids in Potable Water

Major Constituents

(1.0 to 1000 mg/L)

Secondary Constituents(0.01 to 10.0 mg/L)

Minor Constituents(0.0001 to 0.1 mg/L)

Trace Constituents(generally less than0.001 mg/L)

a These elements occupy an uncertain position in the list

Source: From Davis and DeWiest, Hydrogeology, John Wiley & Sons, Copyright 1966

Table 8A.5 Characteristics of Water That Affect Water Quality

dissolved in the water

Calcium and magnesiumcombine with soap to form an

USGS classification of hardness(mg/L as CaCO3)

insoluble precipitate (curd) and 0–60: Softthus hamper the formation of a 61–120: Moderately hardlather Hardness also affects 121–180: Hard

the suitability of water for use inthe textile and paper industriesand certain others and insteam boilers and waterheating

More than 180: Very hard

pH (or hydrogen-ion

activity)

Dissociation of water moleculesand of acids and basesdissolved in water

The pH of water is a measure ofits reactive characteristics

Low values of pH, particularlybelow pH 4, indicate acorrosive water that will tend todissolve metals and othersubstances that it contacts

High values of pH, particularlyabove pH 8.5, indicate analkaline water that, on heating,will tend to form scale The pHsignificantly affects thetreatment and use of water

pH values: less than 7, water isacidic; value of 7, water isneutral; more than 7, water isbasic

(Continued)

Table 8A.5 (Continued)

conductance, the moremineralized the water

Conductance values indicate theelectrical conductivity, inmicromhos, of 1 cm3of water

USGS classification of waterbased on dissolved solids(mg/L)

and is, therefore, a very useful Less than 1,000: Freshparameter in the evaluation of 1,000–3,000: Slightly salinewater quality Water containing

less than 500 mg/L is preferred

3,000–10,000: Moderatelysaline

for domestic use and for many 10,000–35,000: Very saline

Source: From Heath, R.C., 1984, Basic groundwater hydrology, U.S Geological Survey Water-Supply Paper 2220

HAWAIIRegional data not available

350 PPM

Figure 8A.1 Dissolved solids in surface water (From U.S Water Resources Council, 1968.)

150

Stn 028015Tennessee R

United States

Stn 001005

R de la Plata

Stn 054002Chao Phrya R

Thailand

Argentina

Stn 033004Murray DarlingAustralia

Stn 075006Ebro EnMendaviaSpain

Stn 080007 Sagami R

30502520199014609304002251901551208550100806040200

3310029240253802152017660138001400115090065040015012259807354902450

2151901651401159016515013512010590450380310240170100Japan

Figure 8A.2 Seasonal variation of total dissolved solids (TDS) and water discharge at selected world river stations for selected

years (From United Nations Environment Programme, Global Environment Monitoring System Water Programme(GEMS/WATER), The annotated digital atlas of global water quality,www.gemswater.org Reprinted with permission.)

100 90 80 70 60 50 40 30 20 10 0

Agriculture, 119 stations Urban, 26 stations Forest, 98 stations Range, 100 stations

100 90 80 70 60 50 40 30 20 10 0

Agriculture, 83 stations Urban, 20 stations Forest, 77 stations Range, 80 stations

Land use

0 0

Concentration and trends in dissolved oxygen in stream water at 424 selected water-quality monitoring stations in the

conterminous United States, water years 1980−89

Concentration and trends in fecal coliform bacteria in stream water at 313 selected water-quality monitoring stations in the

conterminous United States, water years 1980−89

Figure 8A.3 Concentration trends in dissolved oxygen and fecal coliform bacteria in United States rivers, 1980–1989 (From USDA,

Natural Resources Conservation Services, 1997, Water Quality and Agriculture, Status, Conditions, and Trends,

www.nrcs.usda.gov Original Source: Smith, R.A., Alexander, R.B., and Lanfear, K.J., 1993, Stream water quality in theconterminous United States – status and trends of selected indicators during the 1980’s in National Water Summary1990–91 – Stream water quality, U.S Geological Survey Water-Supply Paper 2400,www.usgs.gov.)

1980 1981 1982 1983 1984 1985 1986 1987 1988 1989

100

100 90

90 80

80 70

70 60

60 50

50 40

40 30

30 20

20 10

10 0

100 90 80 70 60 50 40 30 20 10 0

500 Miles

500 km 0

0

Concentration and trends total phosphorus in stream water at 410 selected water-quality monitoring stations in the

conterminous United States, water years 1982−1989

Concentration and trends in nitrate in stream water at 344 selected water-quality monitoring stations in the

conterminous United States, water years 1980−1989

Figure 8A.4 Concentration trends in phosphorous, nitrate, and suspended solids in United States rivers, 1980 to 1989 (From USDA,

Natural Resources Conservation Services, 1997, Water quality and agriculture, status, conditions, and trends,

www.nrcs.usda.gov Original Source: Smith, R.A., Alexander, R.B., and Lanfear, K.J., 1993, Stream water quality in theconterminous United States – status and trends of selected indicators during the 1980’s in National Water Summary1990–91–Stream water quality, U.S Geological Survey Water-Supply Paper 2400,www.usgs.gov.)

Land use

Explanation

Trend in concentration

in percent

Concentration and trends in suspended sediment in stream water at 324 selected water-quality monitoring stations

in the conterminous United States, water years 1980−1989

100 90 80 70 60 50 30 10 0

500 mg/L 1,000 mg/L

100 mg/L

Range, 81 stations

500 Miles

500 km 0

0

Figure 8A.4 (Continued )

Table 8A.6 Trends of Surface-Water Quality in the United States, 1974–1981

Number of Stations with—

Constituents and

Properties

IncreasingTrends

NoChange

DecreasingTrends

TotalStations

Note: Selected water-quality constituents and properties at NASQAN stations

Source: From U.S Geological Survey Water-Supply Paper 2250

Nitrite plus nitrate

Lead_water_filtered_micrograms per liter

Chloride_water_filtered_milligrams per liter

Figure 8A.5 United States Geological Survey NAWQA water quality thematic maps showing maximum concentrations of suspended

sediment, nitrite plus nitrate, lead, arsenic, chloride, and phosphorous detected in rivers of the United States (From UnitedStates Geological Survey, NAWQA Date Warehouse Mapper,www.maptrek.er.usgs.gov/NAWQAMapTheme/index.jsp,Maps generated in May 2005.)

Table 8A.7 Estimates of National Background Nutrient Concentrations in the United States

Nutrient

BackgroundConcentration(mg/L)Total nitrogen in streams

(Data from 28 watersheds in first 20 study units)

1.0

Orthophosphate in shallow groundwater

(Data from 47 wells in first 20 study units)

0.02

Source: From U.S Geological Survey, 1999, The quality of our nation’s waters, nutrients and pesticides,

U.S Geological Survey Circular 1225,http://usgs.gov

Calcium (Ca) Magnesium (Mg)

Sodium (Na)

Potassium (K)

Lithium (Li) Bicarbonate

Sulfate

Chloride (Cl)

Fluoride (F) Boron (B) Bromlum (Br)

Total Percent Precauseway

Note: Composition, in percentage by weight, of dissolved ions in brine

Source: From Modified from Arnow, Ted, 1984, Water-level and water-quality changes in Great Salt Lake, Utah, 1847–1983, U.S Geological Survey Circ 913; 1998 Data Utah Geological

Measurementsmade innonconsecutiveyearsRailroadcausewayconstrcted

Post-causeway

30272421181512

9630

Figure 8A.6 Salinity in the Great Salt Lake, Utah 1950–1998 The Salinity of Great Salt Lake is determined by the amount of inflow (and its

salt content) and the amount of evaporation When there is a lot of inflow, the lake elevation increases and the salinity of thewater decreases When there is less inflow or the evaporation rate is high, the lake elevation declines and the water becomessaltier In 1959, a solid-fill railroad causeway was constructed across the middle of the lake The causeway divides the lakeinto two parts: the north part (Gunnison Bay), which receives little freshwater inflow, and the south part (Gilbert Bay), whichreceives almost all the inflow For any given lake elevation, the salinity of Gunnison Bay is always greater than the salinity ofGilbert Bay The USGS measures salinity periodically at Saltair Boat Harbor and at Promontory (Gilbert Bay) and at Saline(Gunnison Bay) (From U.S Geological Survey,http://ut.water.usgs.gov/salinity/index.html.)

CondensationNitrogen, oxygencarbon dioxidedissolved

1 CO2 added, forming carbonic acid

2 SO4 dissolved in areas, where oxidation of sulfides is occuring

3 Connate water or soluble compounds of marine sediments added

Evporation Mineral matter re-tained in soil

TranspirationMineral matterlargely retained

in soil, partlycarried off incrop plants

2 Reaction of soil minerals with carbonic acid to form soluble bicarbonates

3 Precipitation of colloidal iron, aluminum, and silica, of car- bonates as solubility limit is reached

4 Cation exchangeRunoff

Carries mineral matter back

Subsurface outflow to ocean

2 Sulfate reduction by anaerobic bacteria substituting bicarbonate for the sulfate

Ocean

Figure 8A.7 Geochemical cycle of surface and groundwater (From U.S Geological Survey.)

Table 8A.9 Natural Inorganic Constituents Commonly Dissolved in Groundwater That Are Most Likely to Affect Use of the Water

Concentrations ofSignificance (mg/L)a

25–50

Chloride (Cl) In inland areas, primarily from seawater

trapped in sediments at time ofdeposition; in coastal areas, fromseawater in contact with freshwater

in productive aquifers

In large amounts, increasecorrosiveness of water and, incombination with sodium, giveswater a salty taste

250

Fluoride (F) Both sedimentary and igneous rocks

Not widespread in occurrence

In certain concentrations, reducestooth decay; at higherconcentrations, causes mottling oftooth enamel

0.7–1.2b

Iron (Fe) and

manganese (Mn)

Iron present in most soils and rocks;

manganese less widely distributed

Stain laundry and are objectionable

in food processing, dyeing,bleaching, ice manufacturing,brewing, and certain otherindustrial processes

FeO0.3, MnO0.05

Sodium (Na) Same as for chloride In some sedimentary

rocks, a few hundred milligrams per litermay occur in freshwater as a result ofexchange of dissolved calcium andmagnesium for sodium in the aquifermaterials

See chloride In largeconcentrations, may affectpersons with cardiac difficulties,hypertension, and certain othermedical conditions Depending onthe concentrations of calcium andmagnesium also present in thewater, sodium may be detrimental

to certain irrigated crops

69 (irrigation),20–170 (health)c

Sulfate (SO4) Gypsum, pyrite (FeS), and other rocks

containing sulfur (S) compounds

In certain concentrations, giveswater a bitter taste and, at higherconcentrations, has a laxativeeffect In combination withcalcium, forms a hard calciumcarbonate scale in steam boilers

300–400 (taste),600–1,000(laxative)

a A range in concentration is intended to indicate the general level at which the effect on water use might become significant

b

Optimum range determined by the U.S Public Health Service, depending on water intake

c Lower concentration applies to drinking water for persons on a strict diet; higher concentration is for those on a moderate diet.Source: From Heath, R.C., 1982, Basic groundwater hydrology, U.S Geological Survey Water-Supply Paper 2220

Table 8A.10 Inorganic Substances Found in Groundwater

Concentration(mg/L)

Source: From Office of Technology Assessment 1984, Protecting the

nation’s groundwater from contamination, U.S Congress,Washington DC

Table 8A.11 Summary of Inorganic Elements Found in Rural Water Supplies

Source: From U.S Environmental Protection Agency, 1984, National Statistical Assessment of Rural Conditions, Executive Summary

Office of Drinking Water

Dissolved Oxygen (DO)(mg/L)

Biological Oxygen Demand (BOD)

(mg/L)

Nitrates (c)(mg/L)

AverageLast

AverageLast

AverageLast

3 yrs (b)Canada

Dissolved Oxygen (DO)(mg/L)

Biological Oxygen Demand (BOD)

(mg/L)

Nitrates (c)(mg/L)

AverageLast

AverageLast

AverageLast

(mg/L) (mg/L) (mg/L)

AverageLast

AverageLast

AverageLast2

3 yrs (b)Canada

Total Phosphorus (c)(mg/L)

Ammonium (c)(mg/L)

Lead (c)(mg/L)

AverageLast

AverageLast

AverageLast2

Cadmium (c)(mg/L)

Chromium (c)(mg/L)

Copper (c)(mg/L)

AverageLast

AverageLast

AverageLast

3 yrs (b)Canada

Cadmium (c)(mg/L)

Chromium (c)(mg/L)

Copper (c)(mg/L)

AverageLast

AverageLast

AverageLast

JPN) Data refer to fiscal year (April to March); KOR) Han: samples were taken at 26 km upstream from the mouth of the river due to the tidal influence; FRA) Data refer to hydrologicalyear (September–August) Seine: station under marine influence Rho¨ne since 1987 data refer to another station; DEU) Weser: 1990–1997—BOD7 (208); NLD) Mass-Eijsden 1990and 1993–1994; Rijn-Lobith 1993–1996: average include limit of detection values; ESP) Guadalquivir: from 1990 onwards data refer to another station closer to the mouth and furtheraway from Sevilla influence; TUR) 1980: 1982 data; UKD) When the parameter is unmeasurable (quantity is too small), the limit of detection values are used when calculating annualaverages Actual averages may therefore to lower Clyde 1980: 1982 data.

Nitrates: CAN) Saskatchewan: N02CN03; U.S.A.) Delaware 1985: 1984 data; KOR) Han: samples were taken at 26 km upstream from the mouth of the rivers due to the tidalinfluence; AUT) 1985: 1984 data; DNK) Data refer to N02CN03; FRA) Data refer to hydrological year (September–August) Loire and Seine: dissolved concentrations Seine: stationunder marine influence Rho¨ne: since 1987 data refer to another station; DEU) Dissolved concentrations; ITA) Po: until 1986 data refer to Ponte Polesella (76 km far from the mouth);since 1989 data refer to Pontelagoscuro (91 km far from the mouth) Metaure 1985: 1984 data; NLD) Rijn-Lobith: dissolved concentrations; NOR) Skienselva and Drammenselva: until

1990 data refer to stations which may have marine influence; from 1990 onwards, data refer to new stations further away from the outlet Skienselva and Glomma 1985: 1983 data.Drammenselva 1985: 1984 data; SPAIN) Dissolved concentrations Guadalquivir: from 1990 onwards data refer to another station closer to the mouth and farther away from Sevillainfluence Ebro 1980: 1981 data; UKD) When the parameter is unreasonable (quantity too small) the limit of detection values are used when calculating annual averages Actualaverages may therefore be lower

Phosphorus: CAN) Columbia 1980: 1981 data; MEX) Orthophosphate concentrations; U.S.A.) Mississippi 1985 and 1990 and Delaware 1998 and 1999: annual averages includeestimated values; KOR) Han samples were taken at 26 km upstream from the mouth of the river due to the tidal influence; AUT) 1985: 1984 data; FRA) Data refer to hydrological year(September–August) Loire—1980: 1982 data: since 1982 data refer to another station Seine: station under marine influence Rho¨ne: sicne 1987 data refer to another station; GRC)Strimonas: 1998 and 1999 data refer to ortho-phosphate; IRL) Boyne: Data refers to ortho-phosphate; ITA) Po: Data until 1988 refer to Ponte Polesella (76 km from the mouth); since

1989 data refer to Pontelagoscuro (91 km from the mouth); Metauro 1985: 1984 data; NOR) Skienselva and Drammenselva: until 1990 data refer to stations which may have marineinfluence; from 1990 onwards, data refer to new stations further away from the outlet; Skienselva and Glomma 1985: 1983 data; SLO) Maly Dunaj: orthophosphate concentrations;1980: 1981 data; SPAIN) Guadalquivir: from 1990 onwards data refer to another station closer to the mouth and farther away from Sevilla influence; TUR) Orthophosphateconcentrations; Yesilirmak 1980 and Gediz 1980: 1982 and 1981 data; UKD) Orthophosphate concentrations When a parameter is unmeasurable (quantity too small), limit ofdetection values are used when calculating annual averages Actual averages may therefore be lower

Ammorium: CAN) Dissolved concentrations 1980: 1981 data; U.S.A.) Delaware and Mississippi: dissolved concentrations; Mississippi: 1980, 1985 and 1999 data include limit ofdetection values; Delaware: 1982, 1983, 1985, 1988, 1992–1999 include limit of detection values; KOR) Han: samples were taken at 26 km upstream from the mouth of the river due tothe tidal influence; AUT) 1985: 1984 data; FRA) Data refer to hydrological year (September–August) Loire and Seine: data refer to dissolved concentrations Seine: station undermarine influence Rho¨ne: since 1987 data refer to another station; DEU) Dissolved concentrations; GRC) 1980: 1982 data; ITA) Po: until 1988 data refer to Ponte Polesella (76 kmfrom the mouth): since 1989 data refer to Pontelagoscuro (91 km from the mouth) Adige 1988 and Metauro 1995: averages represent upper limits Adige 1985: 1984 data; LUX)Moselle 91, 96 to 99: upper limits; Su¨re-Wasserbillig: 1985, 1990–1992, 1994–1999: upper detection limits; NLD) Rhine-Lobith: dissolved concentrations; NOR) Skienselva: until 1990data refer to a station which may have marine influence; from 1990 onwards, data refer to a different station further away from the outlet; ESP) Dissolved concentrations Guadalquivir:from 1990 onwards data refer to another station closer to the mouth and farther away from Sevilla influence; TUR) Excepted for 1990–1991 data refer to NH3 Yesihrmak 1980: 1982data; UKD) When the parameter is unmeasurable (quantity too small) the limit of detection values are used when calculating annual averages Actual averages may therefore belower

Lead: U.S.A.) Delaware: 1988 data represent upper limits: dissolved concentrations Mississippi: dissolved concentrations; KOR) Han: samples were taken at 26 km upstream fromthe mouth of the river due to the tidal influence; AUT) 1985: 1984 data Donau 1980, 82, 86, Inn 1982, 84 and Grossache 1980, 86: limit of detection values; CZE) Labe: from 1988 to

1993 data are upper limit values Morava: 1995 data is an upper limit value; FIN) Tornionjoki and Kymijoki: include limit of detection values; Kokema¨enjoki 1980: 1981 data; FRA) Datarefer to hydrological year (September–August); DEU) Elbe: dissolved concentrations: 1988–1989, 1991–1993 and 1995: include limit of detection values Rhein 1994, 95, Weser1988–1991 and Donau 1996, 97: include limit of detection values; HUN) Until 1994: total concentrations: 1994–1999: dissolved concentrations; LUX) Moselle and Su¨re all years:include limit of detection values; Both analysis methods and limit of detection have changed over the years; NLD) Rijn-Maas Delta 1992 and 1996, and Rijn-Lobith 1995: include limit ofdetection values; NOR) Glomma 1985: 1983 data Drammenselva: until 1990 data refer to a station which may have marine influence; from 1990 onwards, data refer to a new stationfurther away from the outlet All rivers: from 1991 heavy metal concentrations have been determined by a different analysing method; SPAIN) Dissolved concentration Guadalquivir:from 1990 onwards data refer to another station closer to the mouth and farther away from Sevilla influence; SWE) Dissolved concentrations based on analysis of unfiltered samples;TUR) Porsuk 1999: upper limit; UKD) When the parameter is unmeasurable (quantity too small), the limit of detection values are used when calculating annual averages; actualaverages may therefore be lower

Cadmium: U.S.A.) Delaware and Mississippi dissolved concentrations Delaware 1982–1989, 1992–1993, and Mississippi 1980, 1989–1999; include limit of detection values; KOR)Han: samples were taken at 26 km upstream from the mouth of the river due to the tidal influence; AUT) Donau 1980: figure is approximate: Donau 1982, 86–87, 91 and 93, Inn 1984,

86, 88–90, 94 and Grossache 1980, 82 and 84: upper limits 1985: 1984 data; BEL) Meuse (Agimont): 1994–1996 are upper limits; CZE Labe:from 1990 to 1993 data are upper limitvalues Morava: 1993 figure is an upper limit value; FIN) Tornionjoki and Kymijoki: upper limits; 1985: 1984 data; FRA) Data refer to hydrological year (September–August) Loire:since 1988 data refer to another station; 1980 and 1985; 1982 and 1984 data; DEU) Rhein 1984–1989 and 95–97: upper limits: Elbe: data refer to dissolved concentrations; 1990–1991: upper limits Weser 1988–1997, and Donau: upper limits; GRC) Strimonas 1986–1987, 92–94, Axios 1986–1987, Axeloos 1990, 92–96 and Nestos 1986, 92–97: include limit ofdetection values Akeloos and Nestlos 1980: 1982 data; HUN) Until 1994 total concentrations; 1994–1999: dissolved concentrations; Duna: until 1996 total concentrations, 1996–

1999 dissolved concentrations; IRL) Data represent upper limits; ITA) Metauro 1996: upper limits; LUX) Moselle and Su¨re 90 to 99 and Su¨re 1980, 1985, 1989: upper limits; NLD)Rijn/Maas, Delta 1993–1996, Rijn-Lobith 1993–1996 and Ijssel-Kampen 1993, 95–96: upper limits; NOR) Skienselva and Drammenselva: until 1990 data refer to stations which mayhave marine influence; from 1990 onwards, data refer to new stations further away from the outlet Drammenselva 1980 (1981 data): refers to median values, and represents an upperlimit; 1986 figure is a time-weighted average All rivers: from 1991 heavy metal concentrations have been determined by a different analysing method; SPAIN) Dissolvedconcentrations Guadalquivir: from 1990 onwards data refer to another station closer to the mouth and farther away from Sevilla influence; Guadiana 1980: 1981 data; SWE) Dala`venand Morrumsa`n: dissolved concentrations based on analysis of unifiltered samples; TUR) Porsak 1991–1993, 1995, 1997–1999 Sakarya 1989, 1991–1992, 1995, 1998 and Gediz1995: upper limits; UKD) When the parameter is unmeasurable (quantity is too small), limit of detection values are used when calculating annual averages Actual averages maytherefore be lower

Chromium: U.S.A.) Dissolved concentrations Delaware 1980–1982, 1986–1988 and Mississippi 1985, 1988–1989: included limit of detection values; KOR) Han: samples were taken

at 26 km upstream from the mouth of the river due to the tidal influence; AUT) Donau 1982, Inn 1994 and Grossache 1980, 82: include limit of detection values 1985: 1984 data; BEL)Meuse (Agimont): 1994–1995 are upper limits; CZE) Labe 1988–1993: upper limits Odra 1991–1992, 94–95: upper limits Morava 1991–1992 and 1995: upper limits; FIN)Tornionjoki: include limit of detection values Kymijoki 1985: 1984 data; FRA) Data refer to hydrological year (September–August); DEU) Elbe: dissolved concentrations Elbe 1988,

90, 92, Weser 1987–1997, and Donau 1989–1997: include limit of detection values; HUN) Until 1994: total concentrations; 1994–1999; dissolved concentrations; Duna: until 1996 totalconcentrations, 1996–1999 dissolved concentrations; LUX) Moselle 91, 92, 95 to 99 and Su¨re 1991, 93, 95 to 99: include limit of detection values; NOR) Glomma 1985: 1983 dataDrammenselva—1980: 1982 data; until 1990 data refer to a station which may have marine influence; from 1990 onwards, data refer to new station further away from the outlet Allrivers: since 1991 heavy metal concentrations have been determined by a different analysing method Average of last 3 years represent or include the detection limit value (including1998: the detection limit for Cr was 0.5); SPAIN) Dissolved concentrations Guadalquivir: from 1990 onwards data refer to another station closer to the mouth and farther away fromSevilla influence; Guadiana 1985: 1983 data; TUR) Porsuk 1998–1999: upper limits; UKD) When the parameter is unmeasarable (quantity is too small), limit of detection values areused when calculating annual averages Actual averages may therefore be lower Lower Bann: dissolved concentrations

Copper: U.S.A.) Delaware and Mississippi dissolved concentrations; AUT) 1985: 1984 data Grossache 1980: includes limit of detection values; CZE) Morava 1995: upper limit; FRA)Data refer to hydrological year (September–August); DEU) Elbe: dissolved concentrations; HUN) Until 1994: total concentrations; 1994–1999: dissolved concentrations; Duna: until

1996 total concentrations, 1995–1999 dissolved concentrations; LUX) Moselle 91 to 94, 96 to 98 and Su¨re 1990–1991, 93, 95, 99: upper limits; NOR) Skienselva and Drammenselva:until 1990 data refer to stations which may have marine influence: from 1990 onwards, data refer to new stations further away from the outlets Glomma 1985: 1983 data.Drammenselva 1980 (1981data): include limits of detection values and represent a median value All rivers: from 1991 heavy metal concentrations have been determined by a differentanalysing method; SPAIN) Dissolved concentrations Guadalquivir: from 1990 onwards data refer to another station closer to the mouth and farther away from Sevilla influence; SWE)Data refer to dissolved concentrations based on analysis of unfiltered samples; TUR) Porsuk 1988–1998: upper limits; UKD) When the parameter is unreasonable (quantity is toosmall), limit of detection values are used when calculating annual averages Actual averages may therefore be lower

Source: From Tables 3.4A through 3.4I (data from 1996, 1997, 1998, 1999, and average last 3 years), OECD Environmental Data Compendium 2002, q OECD 2002, www.oecd.org

SECTION 8B DRINKING WATER QUALITY STANDARDS UNITED STATES

The U.S Environmental Protection Agency’s National Primary Drinking-Water Regulations and National Secondary Drinking-Water Regulations are summarized in the following tables The primary regulations specify maximum contaminant levels (MCLs), and health advisories The MCLs, which are the maximum permissible level of a contaminant in water at the tap, are health related and are legally enforceable If these concentrations are exceeded or if required monitoring is not performed the public must be notified The secondary drinking-water regulations specify the secondary maximum contaminant levels (SMCL) The SMCLs are for contaminants in drinking water that primarily affect the esthetic qualities related to public acceptance of drinking water; they are intended to be guidelines for the States and are not federally enforceable Health advisories are guidance contaminant levels that would not result in adverse health effects over specified short-time periods for most people.

As provided by the Safe Drinking Water Act of 1974, the U.S Environmental Protection Agency has the primary responsibility for establishing and enforcing regulations However, States may assume primacy if they adopt regulations that are at least as stringent as the Federal regulations in levels specified for protection of public health and in provision

of surveillance and enforcement The States may adopt more stringent regulations and may establish regulations for other constituents.

1976 1979 1986 1987 1989 1991 1992

Final

Regulations

NPD WRs 12/75; 7/76

TTHMs11/79 Fluoride4/86 Phase 1 (VOCs)7/87

TCR 6/89 SWTR6/89

Phase II1/91; 7/91

LCR 6/91

Phase V 7/92

methoxychlor

nitrate radium-2261

radium-2281

seleniumsilvertoxapheneturbidity

totalTHMs2

carbon tetrachloride 1,2-dichloroethane p-dichlorobenzene 1,1-dichloroethylene 1,1,1-trichloroethlane trichloroethylene vinyl chloride 3

total coliforms2

Giardia4

HPCbacteria4

Legionella4

viruses4

2-4-D 2,4,5- TP acrylamide4alachlor aldicarb5aldicarb sulfone 5 aldicarb sulfoxide5asbestos atrazinc barium cadmium carbofuran chlordane

(mono) chlorobenzene chromium dibromochloropropane o-dichlorobenzene cis-1,2-dichloroethylene trans-1,2-dichloroethylene 1,2-dichloropropane epichlorohydrin4ethylbenzene ethylene dibromide heptachlor heptachlor epoxide lindane mercury (inorganic)

methoxychlor nitrate nitrite total nitrate/nitrite PCBs pentachlorophenol selenium styrene tetrachlorethylene toluene toxophene xylenes

copper4

Adupate ethylhexyl) antimony beryilium eyanide dalapon dichloromethane4dinoseb dioxin 2,3,7,8- TCDD) diqual endothall endrin glyphosate

di(2-hexachlorobenzene hexachlorocyclopentadiene nickel oxamyl (vydate) PAHs (benzo(a) pyrene) phthalate, di(2-ethylhexyl) picloram simazine thalium 1,2,4-trichlorobenzene 1,1,2-trichloroethane

Stage 1 DBPR12/98

InterimERSWTR12/98

Radionuclides12/00

Arsenic1/01

1 Radium-226 and radium-228 arecontrol as two contaminants althoughtheir standard is combined

2 Total THMs, haloacetic acids, and total coliforms are counted as one contaminant although both are combined standards: THMs (chloroform, bromodichloromethane, dibromochloromethane, bromoform), TC(total coliform bacteria including fecal coliform and E coli); HAAS (monochloroacetic acid, dichloroaceticacid, trichloroacetic acid, bromoacetic acid, and dibromoacetic acid)

3 Vinyl chloride is also known aschloroethylene & monochloroethylene

4 These nine contaminants have a treatment technique instead of aMCL

5 Aldicarb, aldicarb sulfone, and aldicarb sulfoxide are considered regulated contaminants although theirMCLs are strayed

chloramine chlorine chlorine dioxide chlorine haloacetic acids (HAAS)2TTHMs

Cryptosporidium Glardia turbidity

grass alphagross-betaradium-2261

Table 8B.14 National Primary Drinking Water Standards

Microorganisms

(Continued)

—zero

as of 12/08/03Note:

1

Definitions:

Maximum Contaminant Level (MCL)—The highest level of a contaminant that is allowed in drinking water MCLs areset as close to MCLGs as feasible using the best available treatment technology and taking cost into consideration MCLsare enforceable standards

Maximum Contaminant Level Goal (MCLG)—The level of a contaminant in drinking water below which there is noknown or expected risk to health MCLGs allow for a margin of safety and are non-enforceable public health goals

Maximum Residual Disinfectant Level (MRDL)—The highest level of a disinfectant allowed in drinking water There isconvincing evidence that addition of a disinfectant is necessary for control of microbial contaminants

Maximum Residual Disinfectant Level Goal (MRDLG)—The level of a drinking water disinfectant below which there is

no known or expected risk to health MRDLGs do not reflect the benefits of the use of disinfectants to control microbialcontaminants

Treatment Technique—A required process intended to reduce the level of a contaminant in drinking water

2Units are in milligrams per liter (mg/L) unless otherwise noted Milligrams per liter are equivalent to parts per million

3EPA’s surface water treatment rules require systems using surface water or groundwater under the direct influence ofsurface water to (1) disinfect their water, and (2) filter their water or meet criteria for avoiding filtration so that the followingcontaminants are controlled at the following levels:

Cryptosporidium: (as of 1/1/02 for systems serving O10,000 and 1/14/05 for systems serving !10,000) 99%removal;

Giardia lamblia: 99.9% removal/inactivation;

Viruses: 99.99% removal/inactivation;

Legionella: No limit, but EPA believes that if Giardia and viruses are

Turbidity: At no time can turbidity (cloudiness of water) go above 5 nephelolometric

HPC: No more than 500 bacterial colonies per milliliter

Long Term 1 Enhanced Surface Water Treatment (Effective Date: January 14, 2005); Surface water systems or(GWUDI) systems serving fewer than 10,000 people must comply with the applicable Long Term 1 Enhanced SurfaceWater Treatment Rule provisions (e.g turbidity standards, individual filter monitoring, Cryptosporidium removalrequirements, updated watershed control requirements for unfiltered systems)

Filter Backwash Recycling; The Filter Backwash Recycling Rule requires systems that recycle to return specific recycleflows through all processes of the system’s existing conventional or direct filtration system or at an alternate locationapproved by the state

Fecal coliform and E coli are bacteria whose presence indicates that the water may be contaminated with human or

animal wastes Disease-causing microbes (pathogens) in these wastes can cause diarrhea, cramps, nausea,

headaches, or other symptoms These pathogens may pose a special health risk for infants, young children, and

people with severely compromised immune systems

6

Although there is no collective MCLG for this contaminant group, there are individual MCLGs for some of the individual

contaminants:

Trihalomethanes: bromodichloromethane (zero); bromoform (zero); dibromochloromethane (0.06 mg/L) Chloroform

is regulated with this group but has no MCLG

Haloacetic acids: dichloroacetic acid (zero); trichloroacetic acid (0.3 mg/L) Monochloroacetic acid, bromoacetic acid,

and dibromoacetic acid are regulated with this group but have no MCLGs

7

MCLGs were not established before the 1986 Amendments to the Safe Drinking Water Act Therefore, there is no MCLG

for this contaminant

8Lead and copper are regulated by a Treatment Technique that requires systems to control the corrosiveness of their

water If more than 10% of tap water samples exceed the action level, water systems must take additional steps For

copper, the action level is 1.3 mg/L, and for lead is 0.015 mg/L

9

Each water system must certify, in writing, to the state (using third-party or manufacturer’s certification) that when

acrylamide and epichlorohydrin are used in drinking water systems, the combination (or product) of dose and monomer

level does not exceed the levels specified, as follows:

Acrylamide Z0.05% dosed at 1 mg/L (or equivalent);

Epichlorohydrin Z0.01% dosed at 20 mg/L (or equivalent)

Source: From United States Environmental Protection Agency,www.epa.gov

Table 8A.14 (Continued)

Table 8B.15 National Secondary Drinking Water Standards

Note: National Secondary Drinking Water Regulations (NSDWRs or secondary standards) are

nonenforce-able guidelines regulating contaminants that may cause cosmetic effects (such as skin or toothdiscoloration) or aesthetic effects (such as taste, odor, or color) in drinking water EPA recommendssecondary standards to water systems but does not require systems to comply However, states maychoose to adopt them as enforceable standards

Source: From United States Environmental Protection Agency,www.epa.gov

Table 8B.16 National Proposed MRDLGs, MRDLs, MCLGs, MCLs, AND AMCLs for Radon, Disinfectanct Residuals, and

Disinfection Byproducts

Stage 1 Disinfectants and Disinfection Byproducts Rule

Notes: N/A-Not applicable because there are individual MCLGs for TTHMs or HAAs; MRDLGs, Maximum residual disinfectant levelgoals; MRDLs, Maximum residual disinfectant level; MCLGs, Maximum contaminant level goal; MCLs, Maximum contaminantlevel; AMCL, Alternate Maximum Contaminant Level; pCi/L, picoCuries per liter; mg/L, milligrams per liter

a Total trihalomethanes is the sum of the concentrations of chloroform, bromodichloromethane, dibromochloromethane, and bromoform

b Haloacetic acids (five) is the sum of the concentrations of mono-, di-, and trichloroacetic acids and mono—and dibromoacetic acids.Source: From United States Environmental Protection Agency,www.epa.gov

Compound (mg/L) Alabama California Connecticut Delaware Florida Hawaii Iillinois Massachusetts

New Hampshire New Jersey New York

North Carolina Pennsylvania Utah Wisconsin