EWG's Tap Water Database — 2019 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

2.7 million

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 York466,767
New Jersey656,838
South Carolina75,704
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, 2015-2017

UtilityLocationTestsAverage levelPeople served
Central Garage Water SystemKing William, VA1 of 111.0 ppb1,240
FairleeChestertown, MD1 of 25.00 ppb725
Hudson Water SupplyHudson, IA4 of 44.73 ppb2,282
City of Mount CalmMount Calm, TX1 of 33.27 ppb447
Saint Thomas Aquinas SeminaryDillwyn, VA1 of 12.60 ppb150
Panora Water WorksPanora, IA5 of 52.54 ppb1,272
Kanarraville Town Water SystemKanarraville, UT1 of 41.85 ppb355
Roland Water SupplyRoland, IA1 of 11.80 ppb1,284
Wayland Water SupplyWayland, IA2 of 21.70 ppb966
City of WeinertWeinert, TX1 of 31.67 ppb208
Griswold Water SupplyGriswold, IA1 of 11.60 ppb1,036
Pine Hill Water CompanyWaldorf, MD1 of 11.55 ppb140
Camano Shores CommunityOak Harbor, WA3 of 31.47 ppb67
Chesapeake Ranch EstatesLusby, MD1 of 11.33 ppb8,500
Winterset Municipal WaterworksWinterset, IA1 of 11.30 ppb5,190
Deer Butte SubdivisionAustin, TX2 of 41.20 ppb213
Ainsworth Water WorksAinsworth, IA1 of 11.20 ppb567
Foxcroft SchoolMiddleburg, VA1 of 11.20 ppb300
Minong WaterworksMinong, WI1 of 11.10 ppb561
Liberty RidgeWilliamsburg, VA1 of 11.10 ppb68
Stetsonville WaterworksStetsonville, WI1 of 11.10 ppb563
Twiggs County- General Twiggs DriveJeffersonville, GA3 of 101.07 ppb34
Whitewood ForestWarrenton, VA5 of 51.000 ppb70
Botha SubdivisionWarrenton, VA2 of 21.000 ppb63
Ellsworth WaterworksEllsworth, WI1 of 10.940 ppb3,304
City of CleburneCleburne, TX4 of 240.921 ppb30,573
Winchendon Water Department*Winchendon, MA1 of 10.900 ppb5,706
Gladbrook Water SupplyGladbrook, IA1 of 10.900 ppb945
Green Meadows SubdivisionWarrenton, VA5 of 50.860 ppb340
Pound WaterworksPound, WI1 of 10.860 ppb377
Badger Water SupplyBadger, IA2 of 20.800 ppb561
BenedictLa Plata, MD1 of 20.780 ppb376
Amery WaterworksAmery, WI1 of 10.760 ppb2,962
Mountain Falls Water System UicnPahrump, NV1 of 20.755 ppb1,718
Peshtigo WaterworksPeshtigo, WI1 of 10.750 ppb3,449
Elmo Subdivision 1 & 2 & 3Eagle Rock, MO1 of 10.750 ppb275
Hedrick Water SupplyHedrick, IA1 of 10.700 ppb764
Auburn CrossingWarrenton, VA1 of 10.700 ppb118
Meservey Water SupplyMeservey, IA1 of 10.700 ppb256
Warsaw, Town ofWarsaw, VA1 of 10.700 ppb1,440
Shawano Co. UtilityShawano, WI8 of 80.683 ppb100
SurrencySurrency, GA3 of 40.683 ppb468
St. Marys SeminaryPerryville, MO1 of 10.680 ppb30
Cws Pollys CircleColumbia, SC3 of 70.676 ppb100
RoyaltonRoyalton, MN1 of 50.660 ppb1,250
Leon Water Supply*Leon, IA2 of 20.650 ppb1,977
Sirwa #3 (leon)Creston, IA2 of 20.650 ppb2,395
Town of WillardsWillards, MD1 of 10.640 ppb940
Valley Ranch Municipal Utility District 1Houston, TX2 of 200.635 ppb2,895
Porter SUD*Porter, TX2 of 200.635 ppb15,892

* 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
City of CleburneCleburne, TX4 of 240.921 ppb30,573
Porter SUD*Porter, TX2 of 200.635 ppb15,892
Fort Atkinson WaterworksFort Atkinson, WI3 of 30.547 ppb12,125
West Sound Utility District #1Port Orchard, WA3 of 210.471 ppb18,790
River Falls WaterworksRiver Falls, WI1 of 10.420 ppb15,229
Hudson WaterworksHudson, WI3 of 30.323 ppb17,100
Larchmont UtilitiesSavannah, GA2 of 220.244 ppb11,799
Tifton-Tift County Water System*Tifton, GA3 of 220.186 ppb26,452
City of IrvingIrving, TX1 of 90.143 ppb238,829
Dallas Water Utility*Dallas, TX1 of 90.143 ppb1,197,816
City of DesotoDesoto, TX1 of 90.143 ppb51,700
City of DuncanvilleDuncanville, TX1 of 90.143 ppb39,826
City of Lancaster*Lancaster, TX1 of 90.143 ppb37,550
City of Seagoville*Seagoville, TX1 of 90.143 ppb15,240
Town of AddisonAddison, TX1 of 90.143 ppb15,458
City of Balch SpringsBalch Springs, TX1 of 90.143 ppb30,234
City of CarrolltonCarrollton, TX1 of 90.143 ppb127,980
City of CoppellCoppell, TX1 of 90.143 ppb39,880
City of Farmers BranchFarmers Branch, TX1 of 90.143 ppb31,560
Virgin Valley Water DistrictMesquite, NV1 of 70.130 ppb18,000
City of KyleKyle, TX1 of 100.120 ppb25,443
City of PleasantonPleasanton, TX2 of 240.117 ppb13,776
City of Wichita Falls*Wichita Falls, TX1 of 60.115 ppb103,000
Sheppard Air Force BaseSheppard Afb, TX1 of 60.115 ppb19,500
City of JasperJasper, TX1 of 140.0857 ppb10,388
NixaNixa, MO1 of 90.0689 ppb21,000
City of Beatrice*Beatrice, NE1 of 180.0356 ppb12,496
Wallingford Water DepartmentWallingford, CT1 of 170.0294 ppb37,267
Sardis Lone Elm WSCMidlothian, TX1 of 190.0284 ppb18,612
Hammonton Water DepartmentHammonton, NJ1 of 180.0117 ppb12,153
Elmira Water Board*Elmira, NY1 of 560.0111 ppb65,631
Willingboro MUA*Willingboro, NJ1 of 110.00273 ppb35,000

* 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.