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EWG's Tap Water Database — 2019 UPDATE

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Strontium-90

Three Valleys Municipal Water District

Strontium is a metal that accumulates in the bones. Radioactive strontium-90 can cause bone cancer and leukemia, and any form of strontium at high doses can harm bone health. Read More.

Strontium-90 has been emitted widely by nuclear power plants, weapons facilities, waste sites and nuclear research facilities. Strontium-90 is structurally similar to calcium and is thus taken up into bones. The chief health concerns from strontium-90 exposure are bone cancer and leukemia.

No federal drinking water standards for strontium-90 exist. California set a legal maximum of 8 picocuries of strontium-90 radioactivity per liter of water. California also has a public health goal of no more than 0.35 picocuries of strontium-90 per liter of drinking water. According to studies by the U.S. Geological Survey, strontium-90 also is a concern for water quality in private wells.

Click here to read more on radiological contaminants.

 

6

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.09 pCi/L110.09 pCi/L
2013ND10ND
20140.19 pCi/L110.19 pCi/L
20150.68 pCi/L110.68 pCi/L
20160.06 pCi/L110.06 pCi/L
2017ND10ND

pCi/L = picocuries per liter

State and national drinking water standards and health guidelines

EWG Health Guideline 0.35 pCi/L

The EWG Health Guideline of 0.35 pCi/L for strontium-90 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

All test results

Date Lab ID Result
2012-12-125867-002-09500.09 pCi/L
2013-12-175867-002-1000ND
2014-12-095867-002-10000.19 pCi/L
2015-12-155867-002-09000.68 pCi/L
2016-12-135867-002-16550.06 pCi/L
2017-12-192542-002-0800ND