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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
#
25,9551
30,2431
25,9551
681
1
1,1,1,2-Tetrachloroethane43,6672
1,1,1-Trichloro-2-propanone301
1,1,1-Trichloroethane4,941,05720
1,1,2,2-Tetrachloroethane45,4033
1,1,2-Trichloroethane707,85710
1,1-Dichloroethane*15,878,40838
1,1-Dichloroethylene8,843,96031
1,1-Dichloropropene108,9313
1,2,3-Trichlorobenzene27,4613
1,2,3-Trichloropropane*14,372,25719
1,2,3-trimethylbenzene (hemellitol)10,3881
1,2,4-Trichlorobenzene543,78213
1,2,4-Trimethylbenzene2,679,16823
1,2-Dibromo-3-chloropropane (DBCP)6,872,25413
1,2-Dichloroethane6,501,08227
1,2-Dichloroethylene, cis-8,131,59537
1,2-Dichloroethylene, trans-1,181,06817
1,2-Dichloropropane1,357,80914
1,3,5-Trimethylbenzene2,185,13316
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*88,271,59545
17-beta-Estradiol*251,9741
2
2,2-Dichloropropane43,8673
2,3,7,8-TCDD (Dioxin)13,1501
2,4,5-TP (Silvex)237,8671
2,4-D13,822,26926
2,4-DB3061
2-Furancarboxyaldehyde1,025,9631
2-Hexanone64,8371
2-Methyl naphthalene261
2-Methylbutane47,8701
2-Nitropropane2,0141
3
3-Hydroxycarbofuran305,1223
4
4-Androstene-3,17-dione*19,015,35925
A
Acenaphthene9,3321
Acenaphthylene9,1721
Acetaldhyde1001
Acetochlor492,4704
Acetone11,443,60012
Alachlor (Lasso)2,525,12412
Aldicarb4001
Aldicarb sulfone8,1842
Aldicarb sulfoxide916,9256
Aldrin73,0253
alpha-Chlordane692,3061
alpha-Lindane18,0001
Aluminum90,744,47033
Anthracene16,1641
Antimony24,941,91440
Arsenic108,280,60150
Asbestos248,22712
Atrazine44,409,32735
B
Barium204,304,93050
Benzaldehyde1,5001
Benzene2,663,30128
Benzo[a]anthracene83,4572
Benzo[a]pyrene3,429,96123
Benzo[b]fluoranthene220,0604
Benzo[g,h,i]perylene170,0404
Benzo[k]fluoranthene83,4572
Beryllium5,706,51631
bis(2-chloroethyl) ether491,4364
Bromacil197,2123
Bromate44,670,61629
Bromide30,058,34824
Bromobenzene47,0544
Bromochloroacetic acid51,847,00721
Bromochloromethane*32,173,67641
Bromodichloroacetic acid2,322,3943
Bromodichloromethane226,506,13148
Bromoform155,037,74848
Bromomethane*7,022,88932
Butachlor170,0254
Butane41,2801
Butyl benzyl phthalate629,1073
Butyl citrate87,6331
C
Cadmium7,860,39539
Caffeine2,723,2652
Carbaryl1,1301
Carbofuran1,012,0888
Carbon tetrachloride3,439,79834
Chlorate*204,832,18750
Chlordane3,488,17712
Chlorite26,589,13028
Chloroacetonitrile61,7001
Chlorodibromoacetic acid1,658,8531
Chlorodifluoromethane1,352,5081
Chlorodifluoromethane*29,044,89037
Chloroethane2,059,13814
Chloroform227,007,92848
Chloromethane*18,867,71141
Chlorotoluene, o-47,7507
Chlorotoluene, p-44,7215
Chromium (hexavalent)*247,486,05050
Chromium (total)143,953,98150
Chrysene85,2973
Cobalt*16,112,60334
Cresol, p-45,6121
Cyanazine (Bladex)1,1772
Cyanide33,481,43437
Cyanide (free)2,354,6702
Cyclohexane27,1411
D
Dacthal476,4434
Dalapon7,130,66926
DCPA di-acid degradate1,378,0171
DCPA mono- and di-acid degradates2,930,8424
Ddt53,7631
Desethylatrazine1,444,1753
Desisopropylatrazine276,0341
Di(2-ethylhexyl) adipate1,428,72625
Di(2-ethylhexyl) phthalate30,515,76544
Di-n-butyl phthalate569,1238
Diazinon (Spectracide)4,9601
Dibenz[a,h]anthracene101,3452
Dibromoacetic acid153,536,26945
Dibromochloromethane219,218,88448
Dibromomethane1,354,82821
Dicamba362,86210
Dichloroacetic acid193,730,37247
Dichloroacetonitrile301
Dichlorobenzene, m-202,9286
Dichlorobenzene, o-761,7149
Dichlorobenzene, p-1,833,78826
Dichlorodifluoromethane3,260,70213
Dichlorofluoromethane45,5051
Dichloromethane (methylene chloride)5,754,22740
Dieldrin1,326,5276
Diethyl phthalate555,2635
Diisobutyl phthalate49,5611
Dimethoate5,7001
Dimethyl phthalate65,6962
Dinoseb577,7188
Diquat2,197,8297
E
Endothall204,7755
Endrin2,823,01810
Estriol*18,8082
Ethinyl estradiol*3,188,9864
Ethyl ether1,2271
Ethylbenzene8,667,90946
Ethylene dibromide3,247,55520
F
Fluoranthene53,7672
Fluorene20,0911
Fluoride248,137,81350
Fluridon108,5171
Fonofos321
G
Germanium9,2142
Glyphosate471,0707
H
Haloacetic acids (HAA5)281,128,28650
Heptachlor324,1848
Heptachlor epoxide1,477,83012
Hexachlorobenzene (HCB)296,8077
Hexachlorobutadiene48,2554
Hexachlorocyclopentadiene5,143,83928
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
Isopropylbenzene100,59911
Isopropyltoluene, p-9,8584
L
Lindane346,0598
Lithium4,863,4165
M
Manganese114,402,00449
Mercury (inorganic)7,046,37337
Methane8501
Methomyl8191
Methoxychlor174,9888
Methyl ethyl ketone6,987,2697
Methyl isobutyl ketone6,624,1016
Methylcyclohexane27,1411
Methylcyclopentane17,8411
Metolachlor9,731,59817
Metolachlor ethane sulfonic acid1,137,1081
Metolachlor oxanilic acid1,137,1081
Metribuzin244,7555
Molybdenum*154,030,00550
Monobromoacetic acid92,425,11143
Monochloroacetic acid133,405,91845
Monochlorobenzene (chlorobenzene)1,894,57416
MTBE6,020,55827
N
n-Butylbenzene88,8696
N-Nitrosodi-N-butylamine2,787,0202
N-Nitrosodimethylamine (NDMA)6,026,7232
n-Propylbenzene201,46119
Naphthalene2,159,24419
Nitrate234,166,15649
Nitrate & nitrite161,883,07149
Nitrite32,940,92542
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)*861,95612
Perfluorobutanoic acid (PFBA)*207,4362
Perfluoroheptanoic acid (PFHPA)*9,348,42826
Perfluorohexane sulfonate (PFHXS)*5,185,44525
Perfluorohexanoic Acid*321,2336
Perfluorononanoic acid (PFNA)*682,48110
Perfluorooctane sulfonate (PFOS)*10,660,41027
Perfluorooctanoic acid (PFOA)*8,123,80329
Perfluoropentanoic acid (PFPeA)*139,7644
PFOS and PFOA1,2222
Phenanthrene271,2455
Phenols789,8051
Picloram1,779,02224
Polychlorinated biphenyls (PCBs)193,8764
Prometon5,7001
Propachlor4,2793
Pyrene268,9363
R
Radium, combined (-226 & -228)*156,258,61349
Radon*7,605,14224
S
sec-Butylbenzene17,7244
Selenium67,878,87749
Silver5,037,67522
Simazine17,831,03829
Strontium*257,752,95650
Strontium-90*10,792,7897
Styrene1,809,39731
T
tert-Butyl alcohol2,682,1182
tert-Butylbenzene8,4823
Testosterone*18,568,96223
Tetrachloroethylene (perchloroethylene)24,152,10747
Tetrachloroterephthalic acid1,137,1081
Tetradecanoic acid294,9471
Tetrahydrofuran2,555,3867
Thallium11,351,42038
Thiobencarb5,7001
Thorium1,938,3041
Titanium1,137,1081
Toluene11,266,19847
Total trihalomethanes (TTHMs)292,273,26950
Toxaphene2,003,5614
Tribromoacetic acid484,5412
Trichloroacetic acid185,657,80047
Trichloroethylene19,660,85241
Trichlorofluoromethane5,014,59311
Trichlorotrifluoroethane1,933,4834
Tritium*15,996,5857
U
Uranium, combined (pCi/L)*84,954,80545
V
Vanadium*209,662,22650
Vinyl chloride1,504,37930
X
Xylenes (total)21,059,86446

* 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.