Know Your Environment. Protect Your Health.

Uranium

Tesoro Viejo Master Mwc, Inc.

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.

 

19

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020ND90ND
2021ND20ND
2022ND20ND
2023ND40ND

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
2018-08-15CA2010017_002_002-201808151055ND
2019-06-12CA2010017_006_006-201906121015ND
2020-02-05CA2010017_006_006-202002051000ND
2020-03-03CA2010017_006_006-202003031015ND
2020-03-03CA2010017_003_003-202003031020ND
2020-03-04CA2010017_003_003-202003041030ND
2020-03-04CA2010017_006_006-202003041000ND
2020-03-05CA2010017_006_006-202003051020ND
2020-03-05CA2010017_003_003-202003051025ND
2020-06-03CA2010017_002_002-202006031215ND
2020-06-09CA2010017_001_001-202006090845ND
2021-02-03CA2010017_006_006-202102031045ND
2021-06-09CA2010017_001_001-202106090845ND
2022-02-16CA2010017_006_006-202202160920ND
2022-06-08CA2010017_001_001-202206080930ND
2023-02-14CA2010017_006_006-202302141040ND
2023-06-20CA2010017_001_001-202306200755ND
2023-09-12CA2010017_001_001-202309120840ND
2023-12-05CA2010017_001_001-202312050845ND