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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
*181,4811
*66,7271
11,1041
11,1041
11,1041
1,174,2161
*508,1151
1
1,1,1-Trichloroethane3,971,30014
1,1,2-Trichloroethane41,0183
1,1-Dichloroethane*17,484,49539
1,1-Dichloroethylene3,990,27323
1,2,3-Trichlorobenzene361
1,2,3-Trichloropropane*16,315,77720
1,2,3-trimethylbenzene (hemellitol)10,3881
1,2,4-Trichlorobenzene31,3936
1,2,4-Trimethylbenzene203,52612
1,2-Dibromo-3-chloropropane (DBCP)4,732,1458
1,2-Dichloroethane964,32318
1,2-Dichloroethylene, cis-5,942,95028
1,2-Dichloroethylene, trans-251,4668
1,2-Dichloropropane319,3098
1,3,5-Trimethylbenzene63,3806
1,3-Butadiene*429,9191
1,3-Dichloropropane8,0111
1,4-Dioxane*90,287,55645
17-beta-Estradiol*265,3601
2
2,4-D4,433,69714
2-Furancarboxyaldehyde765,6221
2-Methylbutane28,0021
4
4-Androstene-3,17-dione*20,169,68025
A
Acetochlor383,7233
Acetone5,340,3989
Alachlor (Lasso)25,5013
Aldicarb sulfoxide2001
Aldrin961
Aluminum67,467,53629
Antimony13,133,96531
Arsenic71,035,04848
Asbestos500,9039
Atrazine29,346,43727
B
Barium157,859,86449
Benzaldehyde1,8781
Benzene529,86516
Benzo[a]pyrene1,935,42112
Benzo[b]fluoranthene68,3121
Benzo[k]fluoranthene68,2681
Beryllium1,750,09822
bis(2-chloroethyl) ether494,9364
Bromacil149,9692
Bromate30,603,67326
Bromide27,120,58619
Bromochloroacetic acid46,328,58415
Bromochloromethane*33,293,34242
Bromodichloroacetic acid3,776,1023
Bromodichloromethane217,797,01147
Bromoform123,696,68447
Bromomethane*5,426,68432
Butachlor1101
Butane44,3131
Butyl benzyl phthalate81,1751
Butyl citrate135,4891
C
Cadmium2,478,72729
Carbofuran252,8794
Carbon tetrachloride1,056,87420
Chlorate*208,163,73650
Chlordane2,918,2327
Chlorite25,292,10227
Chlorodibromoacetic acid1,237,3131
Chlorodifluoromethane*30,680,91938
Chloroethane104,2527
Chloroform217,715,60345
Chloromethane*18,847,35840
Chlorotoluene, o-491
Chromium (hexavalent)*249,834,85250
Chromium (total)127,827,78050
Cobalt*16,258,73934
Cresol, p-45,0601
Cyanide22,760,29228
Cyclohexane9,6571
D
Dacthal275,6042
Dalapon3,975,78711
DCPA di-acid degradate1,312,4401
DCPA mono- and di-acid degradates2,144,8693
Desethylatrazine19,2861
Desisopropylatrazine261,7422
Di(2-ethylhexyl) adipate1,043,09411
Di(2-ethylhexyl) phthalate13,912,18533
Di-n-butyl phthalate354,4137
Dibromoacetic acid126,444,80343
Dibromochloromethane197,786,55547
Dibromomethane1,017,7216
Dicamba1,9502
Dichloroacetic acid177,045,02744
Dichlorobenzene, m-2162
Dichlorobenzene, o-9,9823
Dichlorobenzene, p-685,26813
Dichlorodifluoromethane2,379,2356
Dichlorofluoromethane45,5051
Dichloromethane (methylene chloride)572,87619
Dieldrin364,3665
Diethyl phthalate9072
Diisobutyl phthalate60,9081
Dinoseb52,3846
Diquat1,234,8154
E
Endothall6,6562
Endrin66,7732
Estriol*18,1992
Ethinyl estradiol*3,286,5014
Ethyl ether1,2271
Ethylbenzene1,611,48639
Ethylene dibromide784,64314
F
Fluoranthene55,8631
Fluoride212,068,14449
G
Germanium9,2142
Glyphosate8,6612
H
Haloacetic acids (HAA5)273,297,77549
Heptachlor24,7392
Heptachlor epoxide843,9786
Hexachlorobenzene (HCB)65,9941
Hexachlorocyclopentadiene980,73613
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-1,7852
L
Lindane38,5213
Lithium4,686,7734
M
Manganese77,256,09647
Mercury (inorganic)2,499,21225
Methane8501
Methoxychlor1,5311
Methyl ethyl ketone958,6265
Methyl isobutyl ketone3,193,6723
Methylcyclohexane5,6491
Metolachlor5,091,16412
Metolachlor ethane sulfonic acid1,174,2161
Metolachlor oxanilic acid1,174,2161
Metribuzin199,1112
Molybdenum*156,189,48750
Monobromoacetic acid62,812,15836
Monochloroacetic acid98,134,29340
Monochlorobenzene (chlorobenzene)110,6139
MTBE4,834,82722
N
N-Nitrosodi-N-butylamine261,2911
N-Nitrosodimethylamine (NDMA)3,862,5242
n-Propylbenzene101,67011
Naphthalene33,4997
Nitrate223,522,01349
Nitrate & nitrite140,868,35144
Nitrite24,210,38133
O
Octadecanoic acid1,081,1661
Oxamyl (Vydate)228,4182
P
Paraquat1,054,6511
Pentachlorophenol292,3819
Pentane2,0741
Perchlorate8,340,6884
Perfluorobutane sulfonate (PFBS)*370,2505
Perfluoroheptanoic acid (PFHPA)*10,592,56223
Perfluorohexane sulfonate (PFHXS)*6,283,29923
Perfluorohexanoic Acid*61,3081
Perfluorononanoic acid (PFNA)*553,3128
Perfluorooctane sulfonate (PFOS)*11,490,54026
Perfluorooctanoic acid (PFOA)*9,035,82927
Phenanthrene145,2722
Picloram228,01012
Polychlorinated biphenyls (PCBs)27,7412
Potassium-40*128,5521
R
Radium, combined (-226 & -228)*166,903,52850
Radium-226*113,323,25248
Radium-228*117,768,42047
Radon*10,130,52423
S
sec-Butylbenzene2001
Selenium33,390,81245
Silver3,002,29013
Simazine13,622,30516
Strontium*259,537,72550
Strontium-90*4,156,6069
Styrene130,48715
T
tert-Butyl alcohol564,7582
Testosterone*19,510,56823
Tetrachloroethylene (perchloroethylene)19,620,86343
Tetradecanoic acid192,8191
Tetrahydrofuran196,2755
Thallium1,923,39725
Titanium1,174,2161
Toluene1,980,36536
Total trihalomethanes (TTHMs)286,400,20149
Toxaphene301
Tribromoacetic acid297,7231
Trichloroacetic acid168,323,15444
Trichloroethylene15,572,99936
Trichlorofluoromethane4,602,6136
Trichlorotrifluoroethane653,0203
Tritium*6,011,90411
U
Uranium, combined (pCi/L)*82,291,06847
V
Vanadium*211,498,15050
Vinyl chloride444,97314
X
Xylene, m-183,7555
Xylene, m- and p-1,143,61316
Xylene, o-924,46019
Xylene, p-26,9266
Xylenes (total)11,043,87741

* 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.