EWG's Tap Water Database — 2021 UPDATE



Status: No national drinking water standard exists


1,2,4-Trimethylbenzene is a chemical intermediate, industrial solvent and component of gasoline, coal tar and petroleum products. In laboratory animal studies, it harms the adrenal glands.




states detected


utilities detected


people served

Health concerns for 1,2,4-trimethylbenzene

Harm to the central nervous system

Harm to the adrenal gland

Change to blood cells

States reporting 1,2,4-trimethylbenzene in drinking water

State UtilitiesPeople Served
New York13231,367
New Jersey210,300
South Carolina31,347
New Hampshire126

Filtering technologies that reduce 1,2,4-trimethylbenzene

carbon filter icon

Activated Carbon

reverse osmosis icon

Reverse Osmosis

Utilities with the highest amounts of 1,2,4-trimethylbenzene, 2017-2019

UtilityLocationTestsAverage levelPeople served
Central Garage Water SystemKing William, VA1 of 111.0 ppb2,100
Quinton Park SubdivisionNew Kent, VA2 of 27.05 ppb147
Murray, Village ofMurray, NE1 of 26.65 ppb462
Kilmarnock, Town ofKilmarnock, VA1 of 15.80 ppb1,487
FairleeChestertown, MD1 of 25.00 ppb725
Hudson Water SupplyHudson, IA5 of 54.12 ppb2,282
ParrottParrott, GA1 of 93.44 ppb234
De LandDe Land, IL2 of 42.88 ppb450
Minitree GlenNew Kent, VA1 of 12.80 ppb165
Panama Water WorksPanama, IA1 of 12.60 ppb221
Carl Junction PWSCarl Junction, MO2 of 162.39 ppb7,445
Atlantic Municipal UtilitiesAtlantic, IA1 of 12.20 ppb7,232
City of Mount CalmMount Calm, TX2 of 52.12 ppb447
Panora Water WorksPanora, IA7 of 71.99 ppb1,272
Saint Thomas Aquinas SeminaryDillwyn, VA2 of 21.80 ppb150
Roland Water SupplyRoland, IA1 of 11.80 ppb1,284
Wayland Water SupplyWayland, IA2 of 21.70 ppb966
Griswold Water SupplyGriswold, IA1 of 11.60 ppb1,036
Pine Hill Water CompanyWaldorf, MD1 of 11.55 ppb140
Coloma WaterworksColoma, WI1 of 11.50 ppb454
Camano Shores CommunityOak Harbor, WA3 of 31.47 ppb67
Badger Water SupplyBadger, IA3 of 31.33 ppb561
Winterset Municipal WaterworksWinterset, IA1 of 11.30 ppb5,190
Kanarraville Town Water SystemKanarraville, UT1 of 61.23 ppb355
Ainsworth Water WorksAinsworth, IA3 of 31.23 ppb567
Foxcroft SchoolMiddleburg, VA1 of 11.20 ppb300
Liberty RidgeWilliamsburg, VA3 of 31.17 ppb68
Belleville WaterworksBelleville, WI1 of 11.10 ppb2,385
Stetsonville WaterworksStetsonville, WI1 of 11.10 ppb563
Minong WaterworksMinong, WI1 of 11.10 ppb561
Prescott WaterworksPrescott, WI1 of 11.10 ppb4,258
Whitewood ForestWarrenton, VA5 of 51.000 ppb70
West Bend Water DepartmentWest Bend, IA2 of 21.000 ppb785
Botha SubdivisionWarrenton, VA2 of 21.000 ppb46
Deer Butte SubdivisionAustin, TX4 of 60.997 ppb213
Mesa Grande Water Supply CorporationGranbury, TX1 of 120.942 ppb423
Ellsworth WaterworksEllsworth, WI1 of 10.940 ppb3,304
Gladbrook Water SupplyGladbrook, IA1 of 10.900 ppb945
Winchendon Water Department*Winchendon, MA1 of 10.900 ppb5,706
Shawano Co. UtilityShawano, WI15 of 150.879 ppb100
Peshtigo WaterworksPeshtigo, WI3 of 30.870 ppb3,449
OstranderOstrander, MN1 of 50.860 ppb256
Pound WaterworksPound, WI1 of 10.860 ppb377
City of WeinertWeinert, TX1 of 60.833 ppb162
Green Meadows SubdivisionWarrenton, VA6 of 60.833 ppb340
Twiggs County- General Twiggs DriveJeffersonville, GA6 of 170.812 ppb34
Keswick FarmsRoanoke, VA1 of 10.800 ppb60
Blencoe Municipal WaterworksBlencoe, IA1 of 10.800 ppb224
Amery WaterworksAmery, WI1 of 10.760 ppb2,962
Melvin WaterworksSibley, IA2 of 20.750 ppb214

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report 1,2,4-Trimethylbenzene, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
Kaukauna UtilitiesKaukauna, WI1 of 10.750 ppb13,430
City of CleburneCleburne, TX4 of 370.597 ppb30,573
Fort Atkinson WaterworksFort Atkinson, WI4 of 40.543 ppb12,125
Wapello Rural Water Assoc.*Ottumwa, IA1 of 10.500 ppb15,601
Cedar City WaterworksCedar City, UT1 of 180.489 ppb31,223
River Falls WaterworksRiver Falls, WI1 of 10.420 ppb15,229
West Sound Utility District #1Port Orchard, WA3 of 240.413 ppb19,117
Porter SUD*Porter, TX2 of 310.410 ppb15,892
Hudson WaterworksHudson, WI4 of 40.338 ppb17,100
Fort Leonard WoodFt Leonard Wood, MO1 of 220.234 ppb34,000
Larchmont UtilitiesSavannah, GA3 of 410.144 ppb11,799
Tifton-Tift County Water System*Tifton, GA3 of 410.0998 ppb26,452
White Bear TownshipWhite Bear Lake, MN1 of 170.0882 ppb13,610
EdinaEdina, MN1 of 580.0862 ppb49,050
US Army Aviation and Missile CommandRedstone Arsenal, AL2 of 130.0805 ppb38,700
City of PleasantonPleasanton, TX2 of 350.0800 ppb13,776
City of KyleKyle, TX1 of 160.0750 ppb29,118
City of JasperJasper, TX1 of 210.0571 ppb11,825
City of Wichita Falls*Wichita Falls, TX1 of 130.0531 ppb104,553
Sheppard Air Force BaseSheppard Afb, TX1 of 130.0531 ppb19,500
Virgin Valley Water DistrictMesquite, NV1 of 190.0479 ppb18,000
NixaNixa, MO1 of 180.0344 ppb21,000
City of Beatrice*Beatrice, NE1 of 320.0200 ppb12,496
Sardis Lone Elm WSCMidlothian, TX1 of 320.0169 ppb18,612
Acton MUD*Granbury, TX1 of 830.0161 ppb19,125
Wallingford Water DepartmentWallingford, CT1 of 350.0143 ppb37,267
Fort Rucker - American WaterFort Rucker, AL1 of 620.00807 ppb13,880
Hammonton Water DepartmentHammonton, NJ1 of 290.00724 ppb12,153
Elmira Water Board*Elmira, NY1 of 1150.00539 ppb65,631
Long Beach Water DepartmentLong Beach, CA1 of 1730.00370 ppb470,292
Willingboro MUA*Riverside, NJ1 of 260.00115 ppb35,000
New York American Water - LynbrookMerrick, NY1 of 9740.000832 ppb220,000

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report 1,2,4-Trimethylbenzene, but it likely has the contaminant in its water supply.