EPA Drinking Water Contaminant List

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EPA Drinking Water Contaminant List
EPA Drinking Water Contaminant List
Safe Drinking Water Act
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Organic chemical
1,1,1,2-Tetrachloroethane
Candidate
Organic chemical
1,1,1-Trichloroethane
Primary
0.2
Organic chemical
1,1,2-Trichloroethane
Primary
0.005
Organic chemical
1,1-Dichloroethane
Candidate
Organic chemical
1,1-Dichloroethylene
Primary
Organic chemical
1,2,3-Trichloropropane
Candidate
Organic chemical
1,2,4-Trichlorobenzene
Primary
0.07
Organic chemical
1,2-Dibromo-3-chloropropane (DBCP)
Primary
0.0002
Organic chemical
1,2-Dichloroethane
Primary
0.005
Organic chemical
1,2-Dichloroethylene, cis-
Primary
0.07
Organic chemical
1,2-Dichloroethylene, trans-
Primary
0.1
Organic chemical
1,2-Dichloropropane
Primary
0.005
Organic chemical
1,3-Butadiene
Candidate
Organic chemical
1,3-Dinitrobenzene
Candidate
Organic chemical
1,4-Dioxane
Candidate
Organic chemical
1-Butanol
Candidate
Organic chemical
2,4,5-TP (Silvex)
Primary
0.05
Organic chemical
2,4-D
Primary
0.07
Organic chemical
2-Methoxyethanol
Candidate
Organic chemical
2-Propen-1-ol
Candidate
Organic chemical
3-Hydroxycarbofuran
Candidate
Organic chemical
4,4'-Methylenedianiline
Candidate
all mg/L except as noted
0.007
NOTE
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Organic chemical
Acephate
Candidate
Organic chemical
Acetaldehyde
Candidate
Organic chemical
Acetamide
Candidate
Organic chemical
Acetochlor
Candidate
Organic chemical
Acetochlor ethanesulfonic acid (ESA)
Candidate
Organic chemical
Acetochlor oxanilic acid (OA)
Candidate
Organic chemical
Acrolein
Candidate
Organic chemical
Acrylamide
Primary
0.05% dosed at 1 mg/L
Organic chemical
Alachlor
Primary
0.002
Organic chemical
Alachlor ethanesulfonic acid (ESA)
Candidate
Organic chemical
Alachlor oxanilic acid (OA)
Candidate
Organic chemical
Aldicarb
Primary
0.003
Organic chemical
Aldicarb sulfone
Primary
0.002
Organic chemical
Aldicarb sulfoxide
Primary
0.004
Radionuclide
Alpha particles
Primary
15 pCi/L
Inorganic chemical
Aluminum
Secondary
0.05 to 0.2 mg/L
Organic chemical
Aniline
Candidate
Inorganic chemical
Antimony
Primary
0.006
Inorganic chemical
Arsenic
Primary
0.01
Inorganic chemical
Asbestos (fibers >10µm)
Primary
7 Million Fibers/liter (longer than 10 µm)
Organic chemical
Atrazine
Primary
0.003
Inorganic chemical
Barium
Primary
2
Organic chemical
Bensulide
Candidate
Organic chemical
Benzene
Primary
all mg/L except as noted
0.005
NOTE
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Organic chemical
Benzo(a)pyrene (PAHs)
Primary
Organic chemical
Benzyl chloride
Candidate
Inorganic chemical
Beryllium
Primary
0.004
Radionuclide
Beta particles and photon emitters
Primary
4 millirem/year (mrem/year)
Disinfection by-product
Bromate
Primary
0.01
Organic chemical
Butylated hydroxyanisole
Candidate
Organic chemical
Butylbenzene, sec-
Candidate
Inorganic chemical
Cadmium
Primary
Microorganism
Caliciviruses
Candidate
Microorganism
Campylobacter jejuni
Candidate
Organic chemical
Captan
Candidate
Organic chemical
Carbofuran
Primary
0.04
Organic chemical
Carbon tetrachloride
Primary
0.005
Disinfectant
Chloramines (as Cl2)
Primary
4.0
Organic chemical
Chlordane
Primary
0.002
Inorganic chemical
Chloride
Secondary
250 mg/L
Disinfectant
Chlorine (as Cl2)
Primary
4.0
Disinfectant
Chlorine dioxide (as ClO2)
Primary
0.8
Disinfection by-product
Chlorite
Primary
1
Organic chemical
Chlorobenzene
Primary
0.1
Organic chemical
Chloromethane (methyl chloride)
Candidate
Inorganic chemical
Chromium (total)
Primary
Organic chemical
Clethodim
Candidate
Inorganic chemical
Cobalt
Candidate
all mg/L except as noted
0.0002
0.005
0.1
NOTE
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Inorganic chemical
Color
Secondary
15 (color units)
Inorganic chemical
Copper
Secondary
1.0 mg/L
Inorganic chemical
Copper
Primary
1.3
Inorganic chemical
Corrosivity
Secondary
noncorrosive
Microorganism
Cryptosporidium
Primary
99% removal
Organic chemical
Cumene hydroperoxide
Candidate
Inorganic chemical
Cyanide (as free cyanide)
Primary
Microorganism
Cyanotoxins (3)
Candidate
Organic chemical
Dalapon
Primary
0.2
Organic chemical
Di(2-ethylhexyl) adipate
Primary
0.4
Organic chemical
Di(2-ethylhexyl) phthalate
Primary
0.006
Organic chemical
Dichlorobenzene, o-
Primary
0.6
Organic chemical
Dichlorobenzene, p-
Primary
0.075
Organic chemical
Dichloromethane
Primary
0.005
Organic chemical
Dicrotophos
Candidate
Organic chemical
Dimethipin
Candidate
Organic chemical
Dimethoate
Candidate
Organic chemical
Dinoseb
Primary
0.007
Organic chemical
Dioxin (2,3,7,8-TCDD)
Primary
0.00003 ug/L (ppb)
Organic chemical
Diquat
Primary
0.02
Organic chemical
Disulfoton
Candidate
Organic chemical
Diuron
Candidate
Organic chemical
Endothall
Primary
0.1
Organic chemical
Endrin
Primary
0.002
all mg/L except as noted
0.2
NOTE
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Microorganism
Entamoeba histolytica
Candidate
Organic chemical
Epichlorohydrin
Primary
Microorganism
Escherichia coli (0157)
Candidate
Organic chemical
Ethion
Candidate
Organic chemical
Ethoprop
Candidate
Organic chemical
Ethylbenzene
Primary
0.7
Organic chemical
Ethylene dibromide (EDB)
Primary
0.05 ug/L (ppb)
Organic chemical
Ethylene glycol
Candidate
Organic chemical
Ethylene oxide
Candidate
Organic chemical
Ethylene thiourea
Candidate
Organic chemical
Fenamiphos
Candidate
Inorganic chemical
Fluoride
Primary
4
Inorganic chemical
Fluoride
Secondary
2.0 mg/L
Inorganic chemical
Foaming Agents
Secondary
0.5 mg/L
Organic chemical
Formaldehyde
Candidate
Inorganic chemical
Germanium
Candidate
Microorganism
Giardia lamblia
Primary
99.9% removal or inactivation
Organic chemical
Glyphosate
Primary
0.7
Disinfection by-product
Haloacetic acids
Primary
0.06
Organic chemical
HCFC-22
Candidate
Microorganism
Helicobacter pylori
Candidate
Microorganism
Hepatitis A virus
Candidate
Organic chemical
Heptachlor
Primary
0.0004
Organic chemical
Heptachlor epoxide
Primary
0.0002
all mg/L except as noted
NOTE
0.01% dosed at 20 mg/L
Lower level than
current standard
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Microorganism
Heterotrophic plate count
Primary
500 colonies/mL
Organic chemical
Hexachlorobenzene
Primary
0.001
Organic chemical
Hexachlorocyclohexane, alpha-
Candidate
Organic chemical
Hexachlorocyclopentadiene
Primary
Organic chemical
Hexane
Candidate
Organic chemical
Hydrazine
Candidate
Inorganic chemical
Iron
Secondary
0.3 mg/L
Inorganic chemical
Lead
Primary
0.015
Microorganism
Legionella
Primary
no limit
Microorganism
Legionella pneumophila
Candidate
Organic chemical
Lindane
Primary
0.0002
Inorganic chemical
Manganese
Secondary
0.05 mg/L
Inorganic chemical
Mercury (inorganic)
Primary
0.002
Organic chemical
Methamidophos
Candidate
Organic chemical
Methanol
Candidate
Organic chemical
Methoxychlor
Primary
Organic chemical
Methyl bromide (bromomethane)
Candidate
Organic chemical
Methyl tert-butyl ether (MTBE)
Candidate
Organic chemical
Metolachlor
Candidate
Organic chemical
Metolachlor ethanesulfonic acid (ESA)
Candidate
Organic chemical
Metolachlor oxanilic acid (OA)
Candidate
Organic chemical
Molinate
Candidate
Inorganic chemical
Molybdenum
Candidate
Microorganism
Naegleria fowleri
Candidate
all mg/L except as noted
0.05
0.04
NOTE
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Inorganic chemical
Nitrate (as nitrogen)
Primary
Inorganic chemical
Nitrate and Nitrite, total
Inorganic chemical
Nitrite (as nitrogen)
Primary
Organic chemical
Nitrobenzene
Candidate
Organic chemical
Nitrofen
Candidate
Organic chemical
Nitroglycerin
Candidate
Organic chemical
N-Methyl-2-pyrrolidone
Candidate
Organic chemical
N-Nitrosodiethylamine (NDEA)
Candidate
Organic chemical
N-Nitrosodimethylamine (NDMA)
Candidate
Organic chemical
N-Nitroso-di-n-propylamine (NDPA)
Candidate
Organic chemical
N-Nitrosodiphenylamine
Candidate
Organic chemical
N-Nitrosopyrrolidine (NPYR)
Candidate
Inorganic chemical
Odor
Secondary
3 threshold odor number
Organic chemical
Oxamyl (Vydate)
Primary
0.2
Organic chemical
Oxirane, methyl-
Candidate
Organic chemical
Oxydemeton-methyl
Candidate
Organic chemical
Oxyfluorfen
Candidate
Organic chemical
Pentachlorophenol
Primary
Organic chemical
Perchlorate
Candidate
Organic chemical
Permethrin
Candidate
Organic chemical
PFOA (perfluorooctanoic acid)
Candidate
Inorganic chemical
pH
Secondary
6.5-8.5
Organic chemical
Picloram
Primary
0.5
Organic chemical
Polychlorinatedbiphenyls (PCBs)
Primary
0.0005
all mg/L except as noted
NOTE
10
10
1
0.001
Not regulated
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Organic chemical
Profenofos
Candidate
Organic chemical
Propylbenzene, n-
Candidate
Organic chemical
Quinoline
Candidate
Radionuclide
Radium 226 and Radium 228 (combined)
Primary
Organic chemical
RDX (hexahydro-1,3,5-trinitro-1,3,5triazine)
Candidate
Microorganism
Salmonella enterica
Candidate
Inorganic chemical
Selenium
Primary
Microorganism
Shigella sonnei
Candidate
Inorganic chemical
Silver
Secondary
0.10 mg/L
Organic chemical
Simazine
Primary
0.004
Inorganic chemical
Sodium
Inorganic chemical
Strontium
Candidate
Organic chemical
Styrene
Primary
0.1
Inorganic chemical
Sulfate
Secondary
250 mg/L
Organic chemical
Tebuconazole
Candidate
Organic chemical
Tebufenozide
Candidate
Inorganic chemical
Tellurium
Candidate
Organic chemical
Terbufos
Candidate
Organic chemical
Terbufos sulfone
Candidate
Organic chemical
Tetrachloroethylene
Primary
0.005
Inorganic chemical
Thallium
Primary
0.002
Organic chemical
Thiodicarb
Candidate
Organic chemical
Thiophanate-methyl
Candidate
Organic chemical
Toluene
Primary
all mg/L except as noted
5 pCi/L
NOTE
Counts as 2
contaminants
0.05
monitor
1
Not regulated
Primary = enforceable public drinking water contaminant standards
Secondary = non-enforceable contaminants noted for possible cosmetic effects
Candidate = unregulated, potential contaminants
MCL (maximum contaminant level)
or SMCL (secondary maximum contaminant level)
CONTAMINANT
TYPE
CONTAMINANT
REGULATION
LEVEL
Organic chemical
Toluene diisocyanate
Candidate
Organic chemical
Toluidine, o-
Candidate
Microorganism
Total coliforms (includes fecal coliform and
E. coli)
Primary
5.0% positive
Inorganic chemical
Total Dissolved Solids (TDS)
Secondary
500 mg/L
Disinfection by-product
Total Trihalomethanes (THMs, total)
Primary
0.08
Organic chemical
Toxaphene
Primary
0.003
Organic chemical
Tribufos
Candidate
Organic chemical
Trichloroethylene
Primary
Organic chemical
Triethylamine
Candidate
Organic chemical
Triphenyltin hydroxide (TPTH)
Candidate
Microorganism
Turbidity
Primary
1 NTU
Radionuclide
Uranium
Primary
30 µg/L
Organic chemical
Urethane
Candidate
Inorganic chemical
Vanadium
Candidate
Microorganism
Vibrio cholerae
Candidate
Organic chemical
Vinclozolin
Candidate
Organic chemical
Vinyl chloride
Primary
0.002
Microorganism
Viruses (enteric)
Primary
99.99% removal or inactivation
Organic chemical
Xylenes (total)
Primary
10
Inorganic chemical
Zinc
Secondary
5 mg/L
Organic chemical
Ziram
Candidate
all mg/L except as noted
0.005
NOTE

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