Know Your Environment. Protect Your Health.
EWG Home Skin Deep Database Healthy Living App EWG Verified Open menu

EWG’s Tap
Water Database
Water Contamination Water Filter Guide Consumer Resources News & Insights
TAKE ACTION

CONTAMINANT

Tritium

STATES DETECTED

10

serves

2.2 million

utilities detected

70

states detected

0

serves

0

utilities detected

0

Overview

Tritium is a radioactive element emitted from nuclear reactors and weapons production plants. Radiation from tritium and other radioactive substances increases the risk of cancer. Click here to read more on radiological contaminants.

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 400 pCi/L

The EWG Health Guideline of 400 pCi/L for tritium was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.

pCi/L = picocuries per liter

National Standard Exists

Health Concerns:

  • Cancer

understand filter technology

Tritium around the Country

UTILITIES WITH CONTAMINATION
State Utilities People Served
Arkansas26848,972
District Of Columbia3847,323
California6154,729
Connecticut15119,495
South Carolina896,839
Pennsylvania386,473
New York214,494
Illinois26,492
Michigan31,769
Virginia2289

Utilities with the highest amounts of tritium, 2018-2023

ALL UTILITIES
LARGE UTILITIES
Utility Location Tests Average level People served
City of Rock Hill*Rock Hill, SC15 of 15702.67 pCi/L74,377
Fort Mill*Fort Mill, SC15 of 15702.67 pCi/L16,943
Green Earth Public Water SystemRock Hill, SC15 of 15702.67 pCi/L275
York County West Water District*York, SC15 of 15702.67 pCi/L4,272
Catawba Indian Nation Cws (sc4650063)Rock Hill, SC15 of 15702.67 pCi/L440
Bgwc Barney RhettGreenville, SC15 of 15702.67 pCi/L95
Bgwc Country Oaks (sc4650020)Greenville, SC15 of 15702.67 pCi/L362
Bgwc Hickory HillGreenville, SC15 of 15702.67 pCi/L75
Lakewood Shores Improvement AssociationWilmington, IL141 of 247641.63 pCi/L868
Wilmington*Wilmington, IL141 of 247641.63 pCi/L5,624
Conrads ParkKillingly, CT2 of 3586.00 pCi/L60
Kiptopeke InnChesapeake, VA1 of 1296.00 pCi/L159
Bentonville Water Utilities*Bentonville, AR6 of 13220.96 pCi/L51,250
Springdale Water Utilities*Springdale, AR6 of 13220.96 pCi/L95,038
Fayetteville Waterworks*Fayetteville, AR6 of 13220.96 pCi/L105,677
Beaver Water District*Lowell, AR6 of 13220.96 pCi/L54
Rogers Water Utilities*Rogers, AR6 of 13220.96 pCi/L70,878
Chowchilla City Water DepartmentChowchilla, CA1 of 1220.00 pCi/L13,576
Dardanelle Waterworks*Dardanelle, AR6 of 13211.08 pCi/L4,228
La Verne WDLa Verne, CA12 of 25195.84 pCi/L32,206
Three Valleys Municipal Water District*Claremont, CA12 of 25195.84 pCi/L67,018
Golden State Water Company (GSWC) - ClaremontSan Dimas, CA12 of 25195.84 pCi/L39,279
Camp RobinsonNorth Little Rock, AR10 of 25192.33 pCi/L1,500
Wye Mountain Water AssociationLittle Rock, AR10 of 25192.33 pCi/L1,963
Central Arkansas Water*Little Rock, AR10 of 25192.33 pCi/L330,667
Sardis Water AssociationMabelvale, AR10 of 25192.33 pCi/L13,752
Shannon Hills Water DepartmentShannon Hills, AR10 of 25192.33 pCi/L3,832
Lymewood Elderly HousingOld Lyme, CT2 of 2184.40 pCi/L50
Van Buren Waterworks*Van Buren, AR10 of 26179.40 pCi/L22,725
Highway 71 Water District #1 Public Water Authority*Alma, AR10 of 26179.40 pCi/L6,250
Lee Creek Rural Water DistrictMuldrow, OK10 of 26179.40 pCi/L250
Concord Water & Sewer Pfb of Crawford CountyVan Buren, AR10 of 26179.40 pCi/L3,071
Winslow WaterworksWinslow, AR10 of 26179.40 pCi/L1,533
Sequoyah County Rural Water District #7Muldrow, OK10 of 26179.40 pCi/L2,948
Franklin-Sebatian Public Water Authority*Lavaca, AR10 of 26179.40 pCi/L0
Fort Smith Water Utilities*Fort Smith, AR10 of 26179.40 pCi/L86,209
Cedarville WaterworksCedarville, AR10 of 26179.40 pCi/L8,529
ArkomaArkoma, OK10 of 26179.40 pCi/L2,180
Barling Waterworks*Barling, AR10 of 26179.40 pCi/L5,110
Fcmtc WaterworksFort Chaffee, AR10 of 26179.40 pCi/L500
Chester Water Works*Chester, AR10 of 26179.40 pCi/L205
Stanislaus Regional Water Authority*Turlock, CA1 of 3175.00 pCi/L50
RavennaRavenna, MI1 of 1146.00 pCi/L1,219
Windham Water WorksWindham, CT1 of 1143.00 pCi/L21,214
San Miguel Community Services DistrictSan Miguel, CA2 of 7135.57 pCi/L2,600
Fox Laurel Mobile Home Park LLCMontville, CT2 of 4122.50 pCi/L40
Connecticut Correctional InstituteEnfield, CT2 of 4110.25 pCi/L2,385
Vernon Village Inc.Vernon, CT2 of 490.25 pCi/L430
East Windsor Housing AuthorityEast Windsor, CT1 of 190.20 pCi/L94
Arlington CountyArlington, VA2 of 1083.70 pCi/L215,000

* 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 Tritium, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
Fort Mill*Fort Mill, SC15 of 15702.67 pCi/L16,943
City of Rock Hill*Rock Hill, SC15 of 15702.67 pCi/L74,377
Rogers Water Utilities*Rogers, AR6 of 13220.96 pCi/L70,878
Bentonville Water Utilities*Bentonville, AR6 of 13220.96 pCi/L51,250
Fayetteville Waterworks*Fayetteville, AR6 of 13220.96 pCi/L105,677
Springdale Water Utilities*Springdale, AR6 of 13220.96 pCi/L95,038
Chowchilla City Water DepartmentChowchilla, CA1 of 1220.00 pCi/L13,576
La Verne WDLa Verne, CA12 of 25195.84 pCi/L32,206
Three Valleys Municipal Water District*Claremont, CA12 of 25195.84 pCi/L67,018
Golden State Water Company (GSWC) - ClaremontSan Dimas, CA12 of 25195.84 pCi/L39,279
Sardis Water AssociationMabelvale, AR10 of 25192.33 pCi/L13,752
Central Arkansas Water*Little Rock, AR10 of 25192.33 pCi/L330,667
Fort Smith Water Utilities*Fort Smith, AR10 of 26179.40 pCi/L86,209
Van Buren Waterworks*Van Buren, AR10 of 26179.40 pCi/L22,725
Windham Water WorksWindham, CT1 of 1143.00 pCi/L21,214
D.C. Water and Sewer Authority*Washington, DC2 of 1083.70 pCi/L632,323
Arlington CountyArlington, VA2 of 1083.70 pCi/L215,000
City Corporation*Russellville, AR2 of 1174.45 pCi/L29,260
Manchester Water Department*Manchester, CT2 of 836.63 pCi/L51,198
Geneva City*Geneva, NY1 of 333.33 pCi/L13,914
Penn State Univ.*University Park, PA1 of 211.70 pCi/L37,000
Pennsylvania American RoyersfordSpring City, PA1 of 102.87 pCi/L48,253
Southington Water DepartmentSouthington, CT1 of 40.72 pCi/L43,069

* 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 Tritium, but it likely has the contaminant in its water supply.

Know the Standards

Understand EWG’s guidelines on contaminants in your water.

view ewg’s standards

Take Action

Interested in supporting other causes? Learn more about our ongoing campaigns and how you can make a difference.

LEARN MORE

Need help finding a filter?

Discover top-rated filters that protect your family from harmful contaminants.

GET THE GUIDE

We’re in this together

Donate today and join the fight to protect our environmental health.

DONATE TODAY

Protect your water

Sign our petition to protect PFAS drinking water standards

TAKE ACTION