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EWG's Tap Water Database

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All Contaminants

Every contaminant detected nationwide is listed below. Use the search bar to find a specific contaminant.

Contaminant*People served# of states
where detected
#
1,918,7361
251,9381
1
1,1,1-Trichloroethane2,445,48515
1,1,2-Trichloroethane41,0183
1,1-Dichloroethane*16,825,24939
1,1-Dichloroethylene3,976,97623
1,2,3-Trichlorobenzene361
1,2,3-Trichloropropane*16,868,11321
1,2,3-trimethylbenzene (hemellitol)10,3881
1,2,4-Trichlorobenzene31,3936
1,2,4-Trimethylbenzene204,63213
1,2-Dibromo-3-chloropropane (DBCP)4,904,6077
1,2-Dichloroethane550,70117
1,2-Dichloroethylene, cis-6,069,16330
1,2-Dichloroethylene, trans-511,25410
1,2-Dichloropropane566,2768
1,3,5-Trimethylbenzene28,9366
1,3-Butadiene*429,9191
1,3-Dichloropropane8,0111
1,4-Dioxane*88,787,55645
17-beta-Estradiol*265,3601
2
2,4-D4,346,19514
2,4-DB1,2021
2-Furancarboxyaldehyde765,6221
2-Methylbutane28,0021
4
4-Androstene-3,17-dione*20,169,68025
A
Acetochlor371,7233
Acetone6,213,7109
Alachlor (Lasso)25,2762
Aldicarb sulfoxide2001
Aldrin961
Aluminum63,539,25530
Antimony12,248,18631
Arsenic70,523,79847
Asbestos829,8658
Atrazine28,811,59827
B
Barium153,637,48749
Bentazon (Basagran)1,2021
Benzaldehyde1,8781
Benzene469,00417
Benzo[a]pyrene1,974,63312
Benzo[b]fluoranthene68,3121
Benzo[k]fluoranthene68,2681
Beryllium1,585,18420
bis(2-chloroethyl) ether494,9364
Bromacil149,9692
Bromate30,906,08027
Bromide27,354,26420
Bromochloroacetic acid48,788,57016
Bromochloromethane*33,294,82542
Bromodichloroacetic acid3,776,1023
Bromodichloromethane216,723,94447
Bromoform122,833,78447
Bromomethane*5,093,93332
Butachlor1101
Butane44,3131
Butyl benzyl phthalate352,8803
Butyl citrate135,4891
C
Cadmium2,422,15729
Caffeine816,8851
Carbofuran252,8794
Carbon tetrachloride1,117,02818
Chlorate*208,167,88050
Chlordane2,627,6267
Chlorite24,719,62626
Chlorodibromoacetic acid1,237,9131
Chlorodifluoromethane*29,180,91938
Chloroethane104,2527
Chloroform216,715,28944
Chloromethane*18,625,19540
Chromium (hexavalent)*250,050,93150
Chromium (total)128,420,96850
Cobalt*16,444,19934
Cresol, p-45,0601
Cyanide23,039,87128
Cyclohexane9,6571
D
Dacthal264,5001
Dalapon4,059,87612
DCPA di-acid degradate1,312,4401
DCPA mono- and di-acid degradates2,709,7235
Desethylatrazine18,8781
Desisopropylatrazine249,7422
Di(2-ethylhexyl) adipate770,2739
Di(2-ethylhexyl) phthalate13,140,81932
Di-n-butyl phthalate371,2179
Dibromoacetic acid119,582,05242
Dibromochloromethane195,946,12747
Dibromomethane1,093,5216
Dicamba1,9502
Dichloroacetic acid169,529,99442
Dichlorobenzene, m-1261
Dichlorobenzene, o-9,2082
Dichlorobenzene, p-691,86013
Dichlorodifluoromethane2,473,5886
Dichlorofluoromethane45,5051
Dichloromethane (methylene chloride)791,68420
Dichlorprop4371
Dieldrin397,2905
Diethyl phthalate9072
Diisobutyl phthalate60,9081
Dinoseb52,3846
Diquat1,211,6043
E
Endothall6,6562
Endrin66,7732
Estriol*18,1992
Ethinyl estradiol*3,286,5014
Ethyl ether1,2271
Ethylbenzene1,626,01940
Ethylene dibromide781,67913
F
Fluoranthene55,8631
Fluoride207,710,26349
Formaldehyde680,3111
G
Germanium9,2142
Glyphosate8,6612
H
Haloacetic acids (HAA5)257,917,24349
Heptachlor24,7392
Heptachlor epoxide843,9786
Hexachlorobenzene (HCB)65,9941
Hexachlorocyclopentadiene912,30713
Hexadecanoic acid7,511,4871
Hydrogen sulfide8,0691
I
Iodine-131*38,7541
Iodomethane301
Isobutane35,8221
Isophorone68,2681
Isopropyl alcohol23,7941
Isopropyl ether741
Isopropylbenzene11,7203
Isopropyltoluene, p-1,7501
L
Lindane171,3173
Lithium3,594,5573
M
Manganese76,956,68347
Mercury (inorganic)2,747,09126
Methane8501
Methoxychlor1,5311
Methyl ethyl ketone908,2435
Methyl isobutyl ketone3,195,6484
Methylcyclohexane5,6491
Metolachlor5,138,32812
Metribuzin186,9461
Molybdenum*156,245,87450
Monobromoacetic acid57,708,93035
Monochloroacetic acid92,683,89039
Monochlorobenzene (chlorobenzene)117,5918
MTBE2,527,80622
N
N-Nitrosodi-N-butylamine261,2911
N-Nitrosodi-N-propylamine357,7271
N-Nitrosodimethylamine (NDMA)3,800,3412
n-Propylbenzene154,31012
Naphthalene23,3048
Nitrate217,121,53049
Nitrate & nitrite114,688,56644
Nitrite23,316,09034
O
Octadecanoic acid1,081,1661
Oxamyl (Vydate)1,7122
P
Paraquat1,054,6511
Pentachlorophenol318,01710
Pentane641
Perchlorate7,788,7164
Perfluorobutane sulfonate (PFBS)*336,3204
Perfluoroheptanoic acid (PFHPA)*9,092,56223
Perfluorohexane sulfonate (PFHXS)*5,501,30823
Perfluorononanoic acid (PFNA)*553,3128
Perfluorooctane sulfonate (PFOS)*10,702,98326
Perfluorooctanoic acid (PFOA)*7,541,24827
Phenanthrene145,2722
Phenols3,1501
Picloram228,01012
Polychlorinated biphenyls (PCBs)27,7412
Potassium-40*128,5271
R
Radium, combined (-226 & -228)*173,036,76450
Radium-226*115,173,60648
Radium-228*125,563,60147
Radon*13,609,03822
S
sec-Butylbenzene52,8402
Selenium33,853,18145
Silver2,726,70613
Simazine13,394,91816
Strontium*260,359,25650
Strontium-90*5,240,7999
Styrene126,50014
T
tert-Butyl alcohol865,9332
Testosterone*19,510,56823
Tetrachloroethylene (perchloroethylene)18,503,55943
Tetradecanoic acid192,8191
Tetrahydrofuran168,6245
Thallium1,933,21123
Toluene1,773,25537
Total trihalomethanes (TTHMs)280,866,45049
Toxaphene301
Tribromoacetic acid301,7581
Trichloroacetic acid161,096,91142
Trichloroethylene13,906,28736
Trichlorofluoromethane4,544,1146
Trichlorotrifluoroethane676,2813
Tritium*9,157,13512
U
Uranium, combined (pCi/L)*80,059,85245
V
Vanadium*211,500,20450
Vinyl chloride447,17916
X
Xylene, m-183,7875
Xylene, m- and p-1,080,96316
Xylene, o-949,10220
Xylene, p-27,5586
Xylenes (total)10,969,41141

* States and population affected are for 2015 except those chemicals marked with an asterisk. For these chemicals, states and population affected are from 2010-2015. These chemicals were detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program or are radiological contaminants.