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EWG's Tap Water Database — 2019 UPDATE

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Uranium

City of Lake Charles 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.

 

62

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND340ND
2013N/A00N/A
2014N/A00N/A
2015ND220ND
2016N/A00N/A
2017ND60ND

pCi/L = picocuries per liter

State and national drinking water standards and health guidelines

EWG Health Guideline 0.43 pCi/L

The EWG 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.

EPA Maximum Contaminant
Level (MCL) 20 pCi/L

pCi/L = picocuries per liter

All test results

Date Lab ID Result
2012-04-30AD65276ND
2012-04-30AD65261ND
2012-04-30AD65266ND
2012-04-30AD65271ND
2012-04-30AD65276ND
2012-04-30AD65281ND
2012-04-30AD65261ND
2012-04-30AD65266ND
2012-04-30AD65271ND
2012-04-30AD65281ND
2012-05-29AD65721ND
2012-05-29AD65736ND
2012-05-29AD65731ND
2012-05-29AD65726ND
2012-05-29AD65741ND
2012-05-29AD65736ND
2012-05-29AD65726ND
2012-05-29AD65731ND
2012-05-29AD65721ND
2012-05-29AD65741ND
2012-07-23AD67945ND
2012-07-23AD67955ND
2012-07-23AD67950ND
2012-07-23AD67945ND
2012-07-23AD67940ND
2012-07-23AD67935ND
2012-07-23AD67950ND
2012-07-23AD67935ND
2012-07-23AD67940ND
2012-07-23AD67955ND
2012-10-08AD71670ND
2012-10-08AD71680ND
2012-10-08AD71670ND
2012-10-08AD71680ND
2015-07-2735199384005ND
2015-07-2735199384004ND
2015-07-2735199384003ND
2015-07-2735199384001ND
2015-07-2735199384005ND
2015-07-2735199384002ND
2015-07-2735199384001ND
2015-07-2735199384002ND
2015-07-2735199384003ND
2015-07-2735199384004ND
2015-08-0335200616004ND
2015-08-0335200616002ND
2015-08-0335200616001ND
2015-08-0335200616005ND
2015-08-0335200616005ND
2015-08-0335200616003ND
2015-08-0335200616001ND
2015-08-0335200616002ND
2015-08-0335200616003ND
2015-08-0335200616004ND
2015-09-2135208328005ND
2015-09-2135208328005ND
2017-12-18AE20287ND
2017-12-18AE20283ND
2017-12-18AE20279ND
2017-12-18AE20279ND
2017-12-18AE20287ND
2017-12-18AE20283ND