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Uranium

Beauregard Water Works District #3

Uranium is a known human carcinogen. The federal legal limit for uranium is set at 30 micrograms per liter (corresponding to parts per billion), but utilities can also report uranium in picocuries per liter (pCi/L), which is a measure of radioactivity in water. EWG translated all uranium results to pCi/L using a conversion factor developed by the EPA. With this conversion approach, the limit of 30 ppb corresponds to 20 pCi/L. Drinking water with this much uranium would cause more than 4.6 cancer cases in a population of 100,000. California set a public health goal for uranium of 0.43 pCi/L. Read More.

Multiple forms of uranium can be detected in water, including uranium-234, uranium-235 and uranium-238. Uranium-234 is the most toxic form of uranium for human health.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2010N/A00N/A
2011N/A00N/A
2012ND60ND
2013ND50ND
2014N/A00N/A
2015N/A00N/A

pCi/L = picocuries per liter.

State and national drinking water standards and health guidelines

Health Guideline 0.43 pCi/L

The health guideline of 0.43 pCi/L for uranium 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. Three most common uranium isotopes are U-234, U-235 and U-238. All isotopes of uranium are radioactive, and the total radioactivity depends on the ratio of isotopes. This health guideline protects against cancer.

pCi/L = picocuries per liter.

EPA Maximum Contaminant
Level (MCL) 20 pCi/L

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

pCi/L = picocuries per liter.

All test results

Date Lab ID Result
2012-06-193560137W12RND
2012-06-193560137W12RND
2012-11-05AD72963ND
2012-11-05AD72968ND
2012-11-05AD72983ND
2012-11-05AD72978ND
2012-11-05AD72973ND
2012-11-05AD72968ND
2012-11-05AD72963ND
2012-11-05AD72973ND
2012-11-05AD72978ND
2012-11-05AD72983ND
2013-01-14AD74756ND
2013-01-14AD74751ND
2013-01-14AD74746ND
2013-01-14AD74741ND
2013-01-14AD74736ND
2013-01-14AD74756ND
2013-01-14AD74751ND
2013-01-14AD74746ND
2013-01-14AD74741ND
2013-01-14AD74736ND