Know Your Environment. Protect Your Health.

Uranium

Hawkins Water Co-cal Water Service (puc)

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.

 

36

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND60ND
2019N/A00N/A
2020ND20ND
2021N/A00N/A
2022ND140ND
2023ND140ND

pCi/L = picocuries per liter

State, National, and Health Guidelines for Drinking Water

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
2018-02-08CA4900546_003_003-201802080930ND
2018-02-08CA4900546_001_001-201802080925ND
2018-03-14CA4900546_001_001-201803141255ND
2018-03-14CA4900546_003_003-201803141250ND
2018-04-12CA4900546_003_003-201804121115ND
2018-04-12CA4900546_001_001-201804121120ND
2020-07-20CA4900546_001_001-202007201205ND
2020-07-20CA4900546_003_003-202007201215ND
2022-04-12CA4900546_001_001-202204120815ND
2022-04-12CA4900546_003_003-202204120810ND
2022-05-09CA4900546_001_001-202205090815ND
2022-05-09CA4900546_003_003-202205090800ND
2022-06-13CA4900546_003_003-202206130815ND
2022-06-13CA4900546_001_001-202206130810ND
2022-07-12CA4900546_003_003-202207120840ND
2022-07-12CA4900546_001_001-202207120830ND
2022-08-09CA4900546_003_003-202208090820ND
2022-08-09CA4900546_001_001-202208090815ND
2022-10-05CA4900546_001_001-202210050815ND
2022-10-05CA4900546_003_003-202210050810ND
2022-12-13CA4900546_001_001-202212130830ND
2022-12-13CA4900546_003_003-202212130825ND
2023-02-14CA4900546_003_003-202302140815ND
2023-02-14CA4900546_001_001-202302140830ND
2023-03-16CA4900546_001_001-202303160755ND
2023-03-16CA4900546_003_003-202303160750ND
2023-05-16CA4900546_001_001-202305160810ND
2023-05-16CA4900546_003_003-202305160805ND
2023-06-15CA4900546_003_003-202306150755ND
2023-06-15CA4900546_001_001-202306150750ND
2023-07-16CA4900546_001_001-202307160810ND
2023-07-16CA4900546_003_003-202307160815ND
2023-09-13CA4900546_001_001-202309130805ND
2023-09-13CA4900546_003_003-202309130810ND
2023-10-09CA4900546_003_003-202310090750ND
2023-10-09CA4900546_001_001-202310090755ND