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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
11,1041
11,1041
11,1041
251,9381
1
1,1,1-Trichloroethane2,589,24114
1,1,2-Trichloroethane41,0183
1,1-Dichloroethane*16,825,24939
1,1-Dichloroethylene3,931,59023
1,2,3-Trichlorobenzene361
1,2,3-Trichloropropane*16,362,05321
1,2,3-trimethylbenzene (hemellitol)10,3881
1,2,4-Trichlorobenzene31,3936
1,2,4-Trimethylbenzene202,65612
1,2-Dibromo-3-chloropropane (DBCP)4,729,1817
1,2-Dichloroethane550,70117
1,2-Dichloroethylene, cis-6,034,00828
1,2-Dichloroethylene, trans-420,2099
1,2-Dichloropropane234,5858
1,3,5-Trimethylbenzene26,9605
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
Acetone5,602,6639
Alachlor (Lasso)25,2762
Aldicarb sulfoxide2001
Aldrin961
Aluminum64,205,28330
Antimony12,241,77430
Arsenic70,500,07846
Asbestos66,2588
Atrazine28,807,85927
B
Barium153,824,22649
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
Bromide27,347,12420
Bromochloroacetic acid45,916,47515
Bromochloromethane*33,324,82542
Bromodichloroacetic acid3,776,1023
Bromodichloromethane212,840,09447
Bromoform121,624,04947
Bromomethane*5,093,93332
Butachlor1101
Butane44,3131
Butyl benzyl phthalate352,8803
Butyl citrate135,4891
C
Cadmium2,423,92530
Carbofuran252,8794
Carbon tetrachloride1,005,48718
Chlorate*208,167,88050
Chlordane2,627,6267
Chlorite24,719,62626
Chlorodibromoacetic acid1,237,9131
Chlorodifluoromethane*29,180,91938
Chloroethane104,2527
Chloroform213,108,40444
Chloromethane*18,651,94840
Chromium (hexavalent)*250,044,17650
Chromium (total)128,276,95850
Cobalt*16,444,19934
Cresol, p-45,0601
Cyanide23,039,80628
Cyclohexane9,6571
D
Dacthal275,6042
Dalapon3,964,55211
DCPA di-acid degradate1,312,4401
DCPA mono- and di-acid degradates2,146,0714
Desethylatrazine18,8781
Desisopropylatrazine249,7422
Di(2-ethylhexyl) adipate770,2739
Di(2-ethylhexyl) phthalate13,140,81932
Di-n-butyl phthalate371,2179
Dibromoacetic acid117,738,40542
Dibromochloromethane192,387,56947
Dibromomethane1,011,5216
Dicamba1,9502
Dichloroacetic acid166,682,40642
Dichlorobenzene, m-1261
Dichlorobenzene, o-9,2082
Dichlorobenzene, p-691,86013
Dichlorodifluoromethane2,379,1506
Dichlorofluoromethane45,5051
Dichloromethane (methylene chloride)556,80619
Dichlorprop4371
Dieldrin364,3665
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
Ethylbenzene1,624,04339
Ethylene dibromide781,67913
F
Fluoranthene55,8631
Fluoride205,709,09949
G
Germanium9,2142
Glyphosate8,6612
H
Haloacetic acids (HAA5)256,833,81149
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
Lithium3,512,5573
M
Manganese75,230,11947
Mercury (inorganic)2,706,66525
Methane8501
Methoxychlor1,5311
Methyl ethyl ketone683,7114
Methyl isobutyl ketone3,193,6723
Methylcyclohexane5,6491
Metolachlor5,138,32812
Metribuzin186,9461
Molybdenum*156,245,83950
Monobromoacetic acid57,705,68034
Monochloroacetic acid92,534,42738
Monochlorobenzene (chlorobenzene)107,0827
MTBE2,619,67321
N
N-Nitrosodi-N-butylamine261,2911
N-Nitrosodimethylamine (NDMA)3,862,5242
n-Propylbenzene101,67011
Naphthalene23,2547
Nitrate215,645,24149
Nitrate & nitrite114,054,15144
Nitrite23,934,13533
O
Octadecanoic acid1,081,1661
Oxamyl (Vydate)1,7122
P
Paraquat1,054,6511
Pentachlorophenol318,01710
Pentane641
Perchlorate7,093,4224
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)*162,613,79750
Radium-226*111,375,77748
Radium-228*114,138,46447
Radon*8,735,60822
S
sec-Butylbenzene2001
Selenium33,354,23344
Silver2,896,70613
Simazine13,394,91816
Strontium*260,359,25650
Strontium-90*4,156,6069
Styrene126,50014
T
tert-Butyl alcohol564,7582
Testosterone*19,510,56823
Tetrachloroethylene (perchloroethylene)18,069,86043
Tetradecanoic acid192,8191
Tetrahydrofuran165,0894
Thallium1,933,41124
Toluene1,698,80836
Total trihalomethanes (TTHMs)279,951,07549
Toxaphene301
Tribromoacetic acid301,7581
Trichloroacetic acid158,291,73042
Trichloroethylene13,846,32135
Trichlorofluoromethane4,520,8536
Trichlorotrifluoroethane653,0203
Tritium*6,020,14412
U
Uranium, combined (pCi/L)*77,538,77045
V
Vanadium*211,504,63450
Vernolate183,0561
Vinyl chloride447,17916
X
Xylene, m-183,7875
Xylene, m- and p-917,58015
Xylene, o-837,13819
Xylene, p-27,5586
Xylenes (total)10,892,02840

* 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.