Menu

EWG's Tap Water Database

Donate

Uranium

Town of Bunkie Water System

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.

 

16

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
2013N/A00N/A
2014ND20ND
2015ND80ND

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
2012-11-13AD73107ND
2012-11-13AD73107ND
2012-11-13AD73112ND
2012-11-13AD73117ND
2012-11-13AD73117ND
2012-11-13AD73112ND
2014-12-08AE00415ND
2014-12-08AE00415ND
2015-11-1635217746003ND
2015-11-1635217746002ND
2015-11-1635217746001ND
2015-11-1635217746004ND
2015-11-1635217746003ND
2015-11-1635217746002ND
2015-11-1635217746001ND
2015-11-1635217746004ND