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National Drinking Water Database


National Drinking Water Database - Chemical Contaminants

Potassium-40 (total)


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

Potassium-40 is a radioactive isotope of potassium released from natural deposits, nuclear testing, and industrial and medical instruments.

 
Detected
Found above
health guidelines
Found above
legal limit
States
3
-
-
Water utilities
5
-
-
People Served
86,388
-
-

Potassium-40 (total) Exposure by State

Water utilities in 3 states have reported detecting Potassium-40 (total) in treated tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies.

StateWater Suppliers with Potassium-40 (total) contamination
SystemsPopulation
Wisconsin384,850
New York11,501
Arkansas137
Total586,388

The Most Polluted Communities

5 water utilities reported detecting Potassium-40 (total) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Potassium-40 (total) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Tall Oaks Mhp
Mountain Home, AR
371 of 158 pCi/L
(58 pCi/L)
2Watchtower Bible Tract Society
Patterson, NY
1,50110 of 1753.01 pCi/L
(0 to 152 pCi/L)
3Fond DU Lac Waterworks
Fond Du Lac, WI
42,0003 of 34.94 pCi/L
(4.13 to 5.6 pCi/L)
4Oak Creek Waterworks
Oak Creek, WI
31,4971 of 13.5 pCi/L
(3.5 pCi/L)
5Hudson Waterworks
Hudson, WI
11,3531 of 10.96 pCi/L
(0.96 pCi/L)

Testing Summary for Potassium-40 (total)

Are tests routinely required for Potassium-40 (total) by federal law?No
Water suppliers reporting tests for Potassium-40 (total) (2004-2008):5 of 47,576
Average testing rate for water supplier reporting tests (2004-2008):0.9 per year