National Recommended Water Quality Criteria  Human Health Criteria Table
Human health ambient water quality criteria represent specific levels of chemicals or conditions in a water body that are not expected to cause adverse effects to human health. EPA provides recommendations for “water + organism” and “organism only” human health criteria for states and authorized tribes to consider when adopting criteria into their water quality standards. These human health criteria are developed by EPA under Section 304(a) of the Clean Water Act.
Select pollutant name for current criteria document.
Pollutant  CAS Number  Human Health for the consumption of Water + Organism (µg/L) 
Human Health for the consumption of Organism Only (µg/L) 
Publication Year  Notes 

Acenaphthene (P)  83329  70  90  2015  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
Acrolein (P)  107028  3  400  2015  
Acrylonitrile (P)  107131  0.061  7.0  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Aldrin (P)  309002  0.00000077  0.00000077  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
alphaHexachlorocyclohexane (HCH) (P)  319846  0.00036  0.00039  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
alphaEndosulfan (P)  959988  20  30  2015  
Anthracene (P)  120127  300  400  2015  
Antimony (P)  7440360  5.6  640  1980 
This criterion was revised to reflect EPA's q1* or RfD as contained in the Integrated Risk Information System (IRIS) as of May 17, 2002. The fish tissue bioconcentration factor (BCF) is from the 1980 Ambient Water Quality Criteria document. EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Arsenic (P)  7440382  0.018  0.14  1992 
This criterion is based on carcinogenicity of 106 risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 105, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This recommended water quality criterion for arsenic refers to the inorganic form only. 
Asbestos (P)  1332214  7 million fibers/L  —  1991 
EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Barium  7440393  1,000  —  1986 
EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This human health criterion is the same as originally published in the Quality Criteria for Water, 1976 ("Red Book") which predates the 1980 methodology and did not utilize the fish ingestion BCF approach. This same criterion value is published in the Quality Criteria for Water, 1986 ("Gold Book"). 
Benzene (P)  71432  0.582.1  1658  2015 
EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Benzidine (P)  92875  0.00014  0.011  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Benzo(a)anthracene (P)  56553  0.0012  0.0013  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Benzo(a)pyrene (P)  50328  0.00012  0.00013  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Benzo(b)fluoranthene (P)  205992  0.0012  0.0013  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Benzo(k)fluoranthene (P)  207089  0.012  0.013  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Beryllium (P)  7440417  —  —  —  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
betaHexachlorocyclohexane (HCH) (P)  319857  0.0080  0.014  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
betaEndosulfan (P)  33213659  20  40  2015  
Bis(2Chloro1methylethyl) Ether (P)  108601  200  4,000  2015  
Bis(2Chloroethyl) Ether (P)  111444  0.030  2.2  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Bis(2Ethylhexyl) Phthalate (P)  117817  0.32  0.37  2015 
EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Bis(Chloromethyl) Ether  542881  0.00015  0.017  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Bromoform (P)  75252  7.0  120  2015 
EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Butylbenzyl Phthalate (P)  85687  0.10  0.10  2015  This criterion is based on carcinogenicity of 106 risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 105, move the decimal point in the recommended criterion one place to the right). 
Cadmium (P)  7440439  —  —  —  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Carbon Tetrachloride (P)  56235  0.4  5  2015 
EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Chlordane (P)  57749  0.00031  0.00032  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This criterion is based on carcinogenicity of 106 risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 105, move the decimal point in the recommended criterion one place to the right). 
Chlorobenzene (P)  108907  100  800  2015 
The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Chlorodibromomethane (P)  124481  0.80  21  2015 
EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Chloroform (P)  67663  60  2,000  2015 
EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Chlorophenoxy Herbicide (2,4D)  94757  1,300  12,000  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Chlorophenoxy Herbicide (2,4,5TP) [Silvex]  93721  100  400  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Chromium (III) (P)  16065831  Total  —  —  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Chromium (VI) (P)  18540299  Total  —  —  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Chrysene (P)  218019  0.12  0.13  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Copper (P)  7440508  1,300  —  1992 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). This chemical has a criterion for organoleptic (taste and odor) effects. In some cases, the organoleptic criterion may be more stringent. EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Cyanide (P)  57125  4  400  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Dibenzo(a,h)anthracene (P)  53703  0.00012  0.00013  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Dichlorobromomethane (P)  75274  0.95  27  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Dieldrin (P)  60571  0.0000012  0.0000012  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Diethyl Phthalate (P)  84662  600  600  2015  
Dimethyl Phthalate (P)  131113  2,000  2,000  2015  
DinButyl Phthalate (P)  84742  20  30  2015  
Dinitrophenols  25550587  10  1,000  2015  
Endosulfan Sulfate (P)  1031078  20  40  2015  
Endrin (P)  72208  0.03  0.03  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Endrin Aldehyde (P)  7421934  1  1  2015  
Ethylbenzene (P)  100414  68  130  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Fluoranthene (P)  206440  20  20  2015  
Fluorene (P)  86737  50  70  2015  
gammaHexachlorocyclohexane (HCH) [Lindane] (P)  58899  4.2  4.4  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Heptachlor (P)  76448  0.0000059  0.0000059  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Heptachlor Epoxide (P)  1024573  0.000032  0.000032  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Hexachlorobenzene (P)  118741  0.000079  0.000079  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Hexachlorobutadiene (P)  87683  0.01  0.01  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Hexachlorocyclohexane (HCH) Technical  608731  0.0066  0.010  2015  This criterion is based on carcinogenicity of 106 risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 105, move the decimal point in the recommended criterion one place to the right). 
Hexachlorocyclopentadiene (P)  77474  4  4  2015 
The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Hexachloroethane (P)  67721  0.1  0.1  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Indeno(1,2,3cd)pyrene (P)  193395  0.0012  0.0013  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Isophorone (P)  78591  34  1,800  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Manganese  7439965  50  100  1993 
The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. The Human Health for the consumption of Water + Organism criterion for manganese is not based on toxic effects, but rather is intended to minimize objectionable qualities such as laundry stains and objectionable tastes in beverages. 
Methylmercury (P)  22967926  —  0.3 mg/kg  2001  This fish tissue residue criterion for methylmercury is based on a total fish consumption rate of 0.0175 kg/day. 
Methoxychlor  72435  0.02  0.02  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Methyl Bromide (P)  74839  100  10,000  2015  
Methylene Chloride (P)  75092  20  1,000  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Nickel (P)  7440020  610  4,600  1998  This criterion was revised to reflect EPA's q1* or RfD as contained in the Integrated Risk Information System (IRIS) as of May 17, 2002. The fish tissue bioconcentration factor (BCF) is from the 1980 Ambient Water Quality Criteria document. 
Nitrates  14797558  10,000  —  1986  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Nitrobenzene (P)  98953  10  600  2015  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
Nitrosamines  —  0.0008  1.24  1980  This criterion is based on carcinogenicity of 106 risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 105, move the decimal point in the recommended criterion one place to the right). 
Nitrosodibutylamine  924163  0.0063  0.22  2002  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Nitrosodiethylamine  55185  0.0008  1.24  2002  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Nitrosopyrrolidine  930552  0.016  34  2002  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
NNitrosodimethylamine (P)  62759  0.00069  3.0  2002  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
NNitrosodinPropylamine (P)  621647  0.0050  0.51  2002  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
NNitrosodiphenylamine (P)  86306  3.3  6.0  2002  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Pathogen and Pathogen Indicators  —  —  —  2012 
See EPA's 2012 Recreational Water Quality Criteria For Shellfish see Quality Criteria for Water 1986 ("Gold Book") 
Pentachlorobenzene  608935  0.1  0.1  2015  
Pentachlorophenol (P)  87865  0.03  0.04  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
pH  —  5 – 9  —  1986  
Phenol (P)  108952  4,000  300,000  2015  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
Polychlorinated Biphenyls (PCBs) (P)  0.000064  0.000064  2002 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). This criterion applies to total PCBs (e.g., the sum of all congener or all isomer or homolog or Aroclor analyses). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 

Pyrene (P)  129000  20  30  2015  
Selenium (P)  7782492  170  4200  2002  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Solids Dissolved and Salinity  —  250,000  —  1986  
Tetrachloroethylene (P)  127184  10  29  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Thallium (P)  7440280  0.24  0.47  2003  
Toluene (P)  108883  57  520  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Toxaphene (P)  8001352  0.00070  0.00071  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Trichloroethylene (P)  79016  0.6  7  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Vinyl Chloride (P)  75014  0.022  1.6  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
Zinc (P)  7440666  7,400  26,000  2002  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
1,1,1Trichloroethane (P)  71556  10,000  200,000  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
1,1,2,2Tetrachloroethane (P)  79345  0.2  3  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
1,1,2Trichloroethane (P)  79005  0.55  8.9  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
1,1Dichloroethylene (P)  75354  300  20,000  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
1,2,4,5Tetrachlorobenzene  95943  0.03  0.03  2015  
1,2,4Trichlorobenzene (P)  120821  0.071  0.076  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. This criterion is based on carcinogenicity of 106 risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 105, move the decimal point in the recommended criterion one place to the right). 
1,2Dichlorobenzene (P)  95501  1,000  3,000  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
1,2Dichloroethane (P)  107062  9.9  650  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
1,2Dichloropropane (P)  78875  0.90  31  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
1,2Diphenylhydrazine (P)  122667  0.03  0.2  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
Trans1,2Dichloroethylene (P)  156605  100  4,000  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
1,3Dichlorobenzene (P)  541731  7  10  2015  
1,3Dichloropropene (P)  542756  0.27  12  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
1,4Dichlorobenzene (P)  106467  300  900  2015  EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
2,3,7,8TCDD (Dioxin) (P)  1746016  5.0E9  5.1E9  2002 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). EPA has issued a Maximum Contaminant Level (MCL) for this chemical which may be more stringent. See EPA's National Primary Drinking Water Regulations. 
2,4,5Trichlorophenol  95954  300  600  2015  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
2,4,6Trichlorophenol (P)  88062  1.5  2.8  2015 
This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
2,4Dichlorophenol (P)  120832  10  60  2015  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
2,4Dimethylphenol (P)  105679  100  3,000  2015  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
2,4Dinitrophenol (P)  51285  10  300  2015  
2,4Dinitrotoluene (P)  121142  0.049  1.7  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
2Chloronaphthalene (P)  91587  800  1,000  2015  
2Chlorophenol (P)  95578  30  800  2015  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
2Methyl4,6Dinitrophenol (P)  534521  2  30  2015  
3,3'Dichlorobenzidine (P)  91941  0.049  0.15  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
3Methyl4Chlorophenol (P)  59507  500  2,000  2015  The criterion for organoleptic (taste and odor) effects may be more stringent. See National Recommended Water Quality Criteria  Organoleptic Effects. 
p,p′Dichlorodiphenyldichloroethane (DDD) (P)  72548  0.00012  0.00012  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
p,p′Dichlorodiphenyldichloroethylene (DDE) (P)  72559  0.000018  0.000018  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
p,p′Dichlorodiphenyltrichloroethane (DDT) (P)  50293  0.000030  0.000030  2015  This criterion is based on carcinogenicity of 10^{6} risk. Alternate risk levels may be obtained by moving the decimal point (e.g., for a risk level of 10^{5}, move the decimal point in the recommended criterion one place to the right). 
NOTE: (P)= Priority Pollutant