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National Drinking Water Database

National Drinking Water Database - Chemical Contaminants


Status: Unregulated - EPA has not established a maximum legal limit in tapwater for this contaminant.

Tritium is a pollutant from commercial nuclear reactors, research reactors and government weapons production plants.

Found above
health guidelines
Found above
legal limit
Water utilities
People Served

Tritium Exposure by State

Water utilities in 7 states have reported detecting Tritium in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Tritium contamination
New York547,492
North Carolina12,143

The Most Polluted Communities

56 water utilities reported detecting Tritium in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Tritium level

RankSystem Population Served Positive test results of total reported tests Average Level
1Midland Boro Muni Auth
Midland, PA
3,1943 of 41625.7 pCi/L
(0 to 5707 pCi/L)
2South Tahoe Pud - Main
South Lake Tahoe, CA
60,0001 of 11393 pCi/L
(1393 pCi/L)
3Birch Hill Manor
Pound Ridge, NY
1801 of 11000 pCi/L
(1000 pCi/L)
4Reynolds Resorts - Sacramento Llc
West Sacramento, CA
3001 of 1480 pCi/L
(480 pCi/L)
5Westmoreland Co MA Yough Plant
Greensburg, PA
181,9191 of 1420 pCi/L
(420 pCi/L)
Wilmington, IL
5,604133 of 258382.06 pCi/L
(0 to 11800 pCi/L)
7Phoenixville Water Dept
Phoenixville, PA
16,4382 of 4316.68 pCi/L
(0 to 759 pCi/L)
8Penn State Univ.
University Park, PA
37,0003 of 5300.7 pCi/L
(0 to 691.5 pCi/L)
9West Kern Cwd
Taft, CA
16,8003 of 3212.1 pCi/L
(98.59 to 328.63 pCi/L)
10Wilmington Water Department
Wilmington, DE
140,0001 of 1196.95 pCi/L
(196.95 pCi/L)

Testing Summary for Tritium

Are tests routinely required for Tritium by federal law?No
Water suppliers reporting tests for Tritium (2004-2009):188 of 47,576
Average testing rate for water supplier reporting tests (2004-2009):0.9 per year