Know Your Environment. Protect Your Health.

Uranium

Fcwwd #41/shaver Lake

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.

 

112

Samples

0

Samples exceeding legal limit (MCL)

36

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.03 pCi/L105ND - 3.08 pCi/L
20190.63 pCi/L125ND - 1.88 pCi/L
20200.40 pCi/L268ND - 1.94 pCi/L
20210.63 pCi/L229ND - 2.08 pCi/L
20220.41 pCi/L207ND - 2.30 pCi/L
20230.11 pCi/L222ND - 1.50 pCi/L

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
2018-01-03CA1010017_070_070-201801031052ND
2018-01-03CA1010017_069_069-2018010311371.61 pCi/L
2018-03-07CA1010017_069_069-2018030712041.54 pCi/L
2018-03-07CA1010017_070_070-201803071130ND
2018-05-09CA1010017_070_070-2018050911301.27 pCi/L
2018-05-09CA1010017_071_071-201805091024ND
2018-07-11CA1010017_070_070-2018071111352.75 pCi/L
2018-07-11CA1010017_071_071-201807111052ND
2018-11-06CA1010017_070_070-2018110612253.08 pCi/L
2018-11-06CA1010017_071_071-201811061030ND
2019-01-09CA1010017_071_071-201901091225ND
2019-01-09CA1010017_070_070-2019010911401.88 pCi/L
2019-02-13CA1010017_071_071-201902131145ND
2019-02-13CA1010017_070_070-2019021310171.54 pCi/L
2019-04-03CA1010017_070_070-201904030915ND
2019-04-03CA1010017_071_071-201904030800ND
2019-05-08CA1010017_070_070-2019050810451.27 pCi/L
2019-05-08CA1010017_071_071-201905081010ND
2019-06-11CA1010017_071_071-201906111035ND
2019-06-11CA1010017_070_070-2019061111101.34 pCi/L
2019-07-02CA1010017_070_070-2019070210151.47 pCi/L
2019-07-02CA1010017_071_071-201907020920ND
2020-02-04CA1010017_070_070-2020020411201.94 pCi/L
2020-02-04CA1010017_071_071-202002041110ND
2020-03-10CA1010017_070_070-2020031011001.34 pCi/L
2020-03-10CA1010017_071_071-202003100910ND
2020-04-02CA1010017_070_070-2020040210301.41 pCi/L
2020-04-02CA1010017_071_071-2020040210151.47 pCi/L
2020-05-12CA1010017_070_070-2020051210451.14 pCi/L
2020-05-12CA1010017_071_071-202005121020ND
2020-05-27CA1010017_070_070-2020052710100.80 pCi/L
2020-05-27CA1010017_071_071-202005270950ND
2020-06-02CA1010017_070_070-202006021040ND
2020-06-02CA1010017_071_071-202006021015ND
2020-06-10CA1010017_071_071-202006101020ND
2020-06-10CA1010017_070_070-202006101120ND
2020-07-01CA1010017_070_070-202007011100ND
2020-07-01CA1010017_071_071-202007011030ND
2020-08-04CA1010017_071_071-202008040930ND
2020-08-04CA1010017_070_070-202008041130ND
2020-09-01CA1010017_070_070-202009010945ND
2020-09-01CA1010017_071_071-202009011100ND
2020-10-13CA1010017_070_070-202010131055ND
2020-10-13CA1010017_071_071-202010130959ND
2020-11-02CA1010017_070_070-2020110212150.94 pCi/L
2020-11-02CA1010017_071_071-202011021129ND
2020-12-08CA1010017_070_070-2020120813201.47 pCi/L
2020-12-08CA1010017_071_071-202012081235ND
2021-01-04CA1010017_070_070-2021010411201.47 pCi/L
2021-01-04CA1010017_071_071-202101041042ND
2021-02-08CA1010017_070_070-2021020812301.68 pCi/L
2021-02-08CA1010017_071_071-202102081100ND
2021-03-10CA1010017_071_071-202103101140ND
2021-03-10CA1010017_070_070-2021031012301.81 pCi/L
2021-04-06CA1010017_070_070-2021040609302.08 pCi/L
2021-04-06CA1010017_071_071-202104060920ND
2021-05-05CA1010017_070_070-2021050511151.68 pCi/L
2021-05-05CA1010017_071_071-202105050945ND
2021-06-01CA1010017_070_070-2021060111401.81 pCi/L
2021-06-01CA1010017_071_071-202106011030ND
2021-07-06CA1010017_070_070-2021070609201.88 pCi/L
2021-07-06CA1010017_071_071-202107061030ND
2021-09-14CA1010017_070_070-202109141000ND
2021-09-14CA1010017_071_071-202109141130ND
2021-10-07CA1010017_070_070-2021100711000.78 pCi/L
2021-10-07CA1010017_071_071-202110071025ND
2021-11-09CA1010017_070_070-202111091045ND
2021-11-09CA1010017_071_071-202111091130ND
2021-12-01CA1010017_070_070-2021120110000.75 pCi/L
2021-12-01CA1010017_071_071-202112011040ND
2022-01-10CA1010017_071_071-202201101015ND
2022-01-10CA1010017_070_070-202201100900ND
2022-02-07CA1010017_070_070-202202071230ND
2022-02-07CA1010017_071_071-202202071015ND
2022-03-08CA1010017_070_070-2022030810000.87 pCi/L
2022-03-08CA1010017_071_071-202203081145ND
2022-04-04CA1010017_070_070-2022040411000.97 pCi/L
2022-04-04CA1010017_071_071-202204041315ND
2022-05-03CA1010017_071_071-202205030840ND
2022-05-03CA1010017_070_070-2022050310150.83 pCi/L
2022-06-07CA1010017_071_071-202206071130ND
2022-06-07CA1010017_070_070-2022060710001.10 pCi/L
2022-07-06CA1010017_070_070-2022070609302.30 pCi/L
2022-07-06CA1010017_071_071-202207061030ND
2022-08-08CA1010017_070_070-2022080813451.20 pCi/L
2022-08-08CA1010017_071_071-202208081310ND
2022-09-06CA1010017_070_070-202209061200ND
2022-09-06CA1010017_071_071-202209060820ND
2022-11-01CA1010017_070_070-2022110110000.96 pCi/L
2022-11-01CA1010017_071_071-202211011045ND
2023-01-03CA1010017_071_071-202301031220ND
2023-01-03CA1010017_070_070-2023010313050.91 pCi/L
2023-02-13CA1010017_071_071-202302130945ND
2023-02-13CA1010017_070_070-202302130850ND
2023-03-23CA1010017_071_071-202303231130ND
2023-03-23CA1010017_070_070-202303231245ND
2023-04-12CA1010017_070_070-202304121045ND
2023-04-12CA1010017_071_071-202304121230ND
2023-04-18CA1010017_070_070-202304181340ND
2023-04-18CA1010017_071_071-202304181320ND
2023-05-01CA1010017_070_070-202305011210ND
2023-05-01CA1010017_071_071-202305010920ND
2023-06-01CA1010017_070_070-202306011030ND
2023-06-01CA1010017_071_071-202306011215ND
2023-07-11CA1010017_070_070-202307111130ND
2023-07-11CA1010017_071_071-202307111050ND
2023-08-01CA1010017_071_071-202308011235ND
2023-08-01CA1010017_070_070-202308011330ND
2023-09-08CA1010017_070_070-202309080915ND
2023-09-08CA1010017_071_071-202309080950ND
2023-10-04CA1010017_070_070-2023100409301.50 pCi/L
2023-10-04CA1010017_071_071-202310041030ND