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EWG's Tap Water Database — 2019 UPDATE

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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
#
1,1,1,2-Tetrachloroethane43,6672
1,1,1-Trichloro-2-propanone301
1,1,1-Trichloroethane4,975,91320
1,1,2,2-Tetrachloroethane45,4033
1,1,2-Trichloroethane707,85710
1,1-Dichloroethane*15,865,42838
1,1-Dichloroethylene8,951,38331
1,1-Dichloropropene108,9313
1,2,3-Trichlorobenzene27,4613
1,2,3-Trichloropropane*14,431,46320
1,2,3-trimethylbenzene (hemellitol)10,3881
1,2,4-Trichlorobenzene543,78213
1,2,4-Trimethylbenzene2,663,21722
1,2-Dibromo-3-chloropropane (DBCP)6,869,29012
1,2-Dichloroethane6,454,63827
1,2-Dichloroethylene, cis-8,120,20237
1,2-Dichloroethylene, trans-1,177,61017
1,2-Dichloropropane1,354,84514
1,3,5-Trimethylbenzene2,149,03315
1,3-Butadiene*429,9191
1,3-Dichloropropane51,5084
1,3-Dichloropropene43,6672
1,3-Dichloropropene, cis-89,4002
1,3-Dichloropropene, trans-35,0001
1,4-Dioxane*88,280,78845
17-beta-Estradiol*251,9741
2,2-Dichloropropane43,8673
2,3,7,8-TCDD (Dioxin)13,1501
2,4,5-TP (Silvex)237,8671
2,4-D13,903,35627
2,4-DB3061
2-Furancarboxyaldehyde1,025,9631
2-Hexanone64,8371
2-Methyl naphthalene261
2-Methylbutane47,8701
2-Nitropropane2,0141
3-Hydroxycarbofuran304,5452
4-Androstene-3,17-dione*19,015,35925
A
Acenaphthene9,3321
Acenaphthylene9,1721
Acetaldhyde1001
Acetochlor492,4704
Acetone11,417,56612
Alachlor (Lasso)2,523,05312
Aldicarb4001
Aldicarb sulfone8,1842
Aldicarb sulfoxide916,6016
Aldrin73,0253
alpha-Chlordane692,3061
alpha-Lindane18,0001
Aluminum87,946,44333
Anthracene16,1641
Antimony24,849,09540
Arsenic107,028,84150
Asbestos241,45212
Atrazine43,734,72934
B
Barium200,841,44550
Benzaldehyde1,5001
Benzene2,609,84528
Benzo[a]anthracene83,4572
Benzo[a]pyrene3,429,96123
Benzo[b]fluoranthene85,3413
Benzo[g,h,i]perylene85,0573
Benzo[k]fluoranthene83,4572
Beryllium5,400,14831
bis(2-chloroethyl) ether491,4364
Bromacil197,2123
Bromate44,887,84629
Bromide30,058,34824
Bromobenzene56,1865
Bromochloroacetic acid51,681,97921
Bromochloromethane*32,188,27041
Bromodichloroacetic acid2,322,3943
Bromodichloromethane222,977,97248
Bromoform152,679,76648
Bromomethane*6,571,09432
Butachlor170,0254
Butane41,2801
Butyl benzyl phthalate489,4283
Butyl citrate87,6331
C
Cadmium7,683,70839
Caffeine2,570,8262
Carbaryl1,1301
Carbofuran1,008,1558
Carbon tetrachloride3,061,17134
Chlorate*204,832,18750
Chlordane3,488,17712
Chlorite26,123,28127
Chloroacetonitrile61,7001
Chlorodibromoacetic acid1,658,8531
Chlorodifluoromethane1,352,5081
Chlorodifluoromethane*29,044,89037
Chloroethane2,059,13814
Chloroform223,450,50448
Chloromethane*18,579,04241
Chlorotoluene, o-47,7507
Chlorotoluene, p-44,7215
Chromium (hexavalent)*247,489,33050
Chromium (total)143,334,67050
Chrysene85,2973
Cobalt*16,112,60334
Cresol, p-45,6121
Cyanazine (Bladex)1,1772
Cyanide32,158,95637
Cyanide (free)2,354,6702
Cyclohexane27,1411
D
Dacthal476,4434
Dalapon7,130,66926
DCPA di-acid degradate1,378,0171
DCPA mono- and di-acid degradates2,778,4034
Ddt53,7631
Desethylatrazine1,444,1753
Desisopropylatrazine276,0341
Di(2-ethylhexyl) adipate1,490,20225
Di(2-ethylhexyl) phthalate30,372,14944
Di-n-butyl phthalate429,4448
Dibenz[a,h]anthracene101,3452
Dibromoacetic acid150,289,47445
Dibromochloromethane215,497,93348
Dibromomethane1,348,33121
Dicamba362,86210
Dichloroacetic acid190,217,85747
Dichloroacetonitrile301
Dichlorobenzene, m-202,9286
Dichlorobenzene, o-758,9149
Dichlorobenzene, p-1,778,38826
Dichlorodifluoromethane3,260,70213
Dichlorofluoromethane45,5051
Dichloromethane (methylene chloride)5,588,38339
Dieldrin1,326,5276
Diethyl phthalate415,5845
Diisobutyl phthalate49,5611
Dimethoate5,7001
Dimethyl phthalate15,9601
Dinoseb577,7188
Diquat2,197,8297
E
Endothall204,7755
Endrin2,823,01810
Estriol*18,8082
Ethinyl estradiol*3,188,9864
Ethyl ether1,2271
Ethylbenzene8,548,18146
Ethylene dibromide3,208,08220
F
Fluoranthene53,7672
Fluorene20,0911
Fluoride245,794,23850
Fluridon108,5171
Fonofos321
G
Germanium9,2142
Glyphosate471,0707
H
Haloacetic acids (HAA5)277,591,11250
Heptachlor324,1848
Heptachlor epoxide1,477,83012
Hexachlorobenzene (HCB)296,8077
Hexachlorobutadiene22,6753
Hexachlorocyclopentadiene5,118,11527
Hexadecanoic acid7,890,9921
Hexane(s)14,4961
Hydrogen sulfide7,5062
I
Indeno[1,2,3-cd]pyrene85,2973
Iodomethane5,4621
Isobutane41,5961
Isooctyl alcohol6231
Isophorone67,0531
Isopropyl alcohol28,2243
Isopropyl ether741
Isopropylbenzene98,79410
Isopropyltoluene, p-9,8584
L
Lindane341,4598
Lithium4,863,4294
M
Manganese112,000,78149
Mercury (inorganic)6,585,32737
Methane8501
Methomyl2421
Methoxychlor170,0287
Methyl ethyl ketone6,986,1797
Methyl isobutyl ketone6,622,1126
Methylcyclohexane27,1411
Methylcyclopentane17,8411
Metolachlor9,714,36317
Metolachlor ethane sulfonic acid1,137,1081
Metolachlor oxanilic acid1,137,1081
Metribuzin244,7555
Molybdenum*154,030,14150
Monobromoacetic acid89,784,28843
Monochloroacetic acid129,903,13345
Monochlorobenzene (chlorobenzene)1,814,90416
MTBE5,406,24327
N
n-Butylbenzene88,8696
N-Nitrosodi-N-butylamine2,787,0202
N-Nitrosodimethylamine (NDMA)6,026,7232
n-Propylbenzene201,46119
Naphthalene2,122,38619
Nitrate231,367,00449
Nitrate & nitrite159,821,99649
Nitrite32,995,52942
O
Octadecanoic acid4,043,3581
Oxamyl (Vydate)1,010,0055
P
Paraquat1,224,7141
Pcnb33,3691
Pentachlorophenol1,003,63213
Pentane2,2021
Perchlorate12,061,5897
Perfluorobutane sulfonate (PFBS)*830,38211
Perfluorobutanoic acid (PFBA)*181,4811
Perfluoroheptanoic acid (PFHPA)*9,410,12826
Perfluorohexane sulfonate (PFHXS)*5,149,69324
Perfluorohexanoic Acid*260,1525
Perfluorononanoic acid (PFNA)*656,5269
Perfluorooctane sulfonate (PFOS)*10,433,27327
Perfluorooctanoic acid (PFOA)*8,063,28329
Perfluoropentanoic acid (PFPeA)*109,6313
PFOS and PFOA1,2222
Phenanthrene221,5094
Phenols789,8051
Picloram1,779,02224
Polychlorinated biphenyls (PCBs)193,8764
Potassium-40*126,8491
Prometon5,7001
Propachlor4,2793
Pyrene134,2172
R
Radium, combined (-226 & -228)*152,992,44949
Radon*7,516,48323
S
sec-Butylbenzene17,7244
Selenium65,708,44549
Silver4,987,02722
Simazine17,831,03829
Strontium*257,752,96950
Strontium-90*10,582,4897
Styrene1,782,28729
T
tert-Butyl alcohol2,682,1182
tert-Butylbenzene8,4823
Testosterone*18,568,96223
Tetrachloroethylene (perchloroethylene)23,759,45247
Tetrachloroterephthalic acid1,137,1081
Tetradecanoic acid294,9471
Tetrahydrofuran2,524,4287
Thallium10,487,80538
Thiobencarb5,7001
Thorium1,938,3041
Titanium1,137,1081
Toluene10,853,11247
Total trihalomethanes (TTHMs)288,616,86050
Toxaphene2,003,5614
Tribromoacetic acid484,5412
Trichloroacetic acid182,369,25847
Trichloroethylene19,276,76041
Trichlorofluoromethane5,014,59311
Trichlorotrifluoroethane1,933,4834
Tritium*15,996,5857
U
Uranium, combined (pCi/L)*84,631,17845
V
Vanadium*209,662,22650
Vinyl chloride1,504,37930
X
Xylenes (total)20,789,61046

* States and population affected are for 2015-2017 except those chemicals marked with an asterisk. For these chemicals, states and population affected are from 2012-2017. Chemicals marked with an * were detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program or are radiological contaminants.