Know Your Environment. Protect Your Health.

Uranium

Tahoe Keys Water Company

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.

 

88

Samples

31

Samples exceeding legal limit (MCL)

52

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
202015.14 pCi/L665.31 pCi/L - 26.67 pCi/L
202114.12 pCi/L65ND - 22.00 pCi/L
202214.21 pCi/L2718ND - 30.67 pCi/L
202311.46 pCi/L4923ND - 35.33 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
2020-05-26CA0910015_002_002-2020052608006.11 pCi/L
2020-05-26CA0910015_001_001-2020052607005.31 pCi/L
2020-05-26CA0910015_003_003-20200526084510.10 pCi/L
2020-10-13CA0910015_003_003-20201013073021.33 pCi/L
2020-11-12CA0910015_003_003-20201112093021.33 pCi/L
2020-11-17CA0910015_002_002-20201117093026.67 pCi/L
2021-01-19CA0910015_003_003-20210119083020.00 pCi/L
2021-01-26CA0910015_001_001-20210126083011.33 pCi/L
2021-03-02CA0910015_003_003-20210302083020.00 pCi/L
2021-04-06CA0910015_003_003-20210406083022.00 pCi/L
2021-05-11CA0910015_001_001-20210511084511.39 pCi/L
2021-09-28CA0910015_011_011-202109280845ND
2022-02-16CA0910015_001_001-20220216110012.00 pCi/L
2022-02-16CA0910015_003_003-20220216100017.00 pCi/L
2022-03-15CA0910015_011_011-202203150900ND
2022-03-15CA0910015_003_003-20220315090018.67 pCi/L
2022-04-26CA0910015_011_011-202204260935ND
2022-04-26CA0910015_003_003-20220426093523.00 pCi/L
2022-05-24CA0910015_011_011-202205240945ND
2022-05-24CA0910015_003_003-20220524094522.00 pCi/L
2022-05-25CA0910015_010_010-202205251200ND
2022-05-25CA0910015_002_002-20220525120029.33 pCi/L
2022-06-14CA0910015_003_003-20220614094620.00 pCi/L
2022-06-14CA0910015_011_011-202206140955ND
2022-08-16CA0910015_002_002-20220816104830.67 pCi/L
2022-08-16CA0910015_003_003-20220816103022.00 pCi/L
2022-08-16CA0910015_010_010-202208161048ND
2022-08-16CA0910015_011_011-202208161030ND
2022-09-20CA0910015_002_002-20220920105023.33 pCi/L
2022-09-20CA0910015_003_003-20220920100020.00 pCi/L
2022-10-18CA0910015_003_003-20221018094020.00 pCi/L
2022-10-18CA0910015_002_002-20221018100023.33 pCi/L
2022-11-15CA0910015_003_003-2022111509455.80 pCi/L
2022-11-15CA0910015_002_002-20221115100030.67 pCi/L
2022-11-29CA0910015_001_001-20221129094517.33 pCi/L
2022-12-20CA0910015_011_011-202212201000ND
2022-12-20CA0910015_003_003-20221220100020.67 pCi/L
2022-12-20CA0910015_010_010-202212201040ND
2022-12-20CA0910015_002_002-20221220104028.00 pCi/L
2023-01-17CA0910015_003_003-2023011711004.00 pCi/L
2023-01-17CA0910015_011_011-202301171100ND
2023-01-17CA0910015_010_010-202301171025ND
2023-01-17CA0910015_002_002-20230117102333.33 pCi/L
2023-01-24CA0910015_010_010-202301241000ND
2023-01-24CA0910015_007_007-202301241000ND
2023-01-24CA0910015_011_011-202301241110ND
2023-02-14CA0910015_002_002-20230214100031.33 pCi/L
2023-02-14CA0910015_011_011-202302141050ND
2023-02-14CA0910015_010_010-202302141000ND
2023-02-14CA0910015_003_003-20230214105018.00 pCi/L
2023-03-21CA0910015_002_002-20230321090028.67 pCi/L
2023-03-21CA0910015_003_003-20230321100016.67 pCi/L
2023-03-21CA0910015_010_010-202303210900ND
2023-03-21CA0910015_011_011-202303211000ND
2023-04-04CA0910015_007_007-202304041020ND
2023-04-04CA0910015_001_001-20230404111027.33 pCi/L
2023-04-04CA0910015_010_010-202304041020ND
2023-04-19CA0910015_002_002-20230419NUL27.33 pCi/L
2023-04-19CA0910015_003_003-20230419NUL18.67 pCi/L
2023-04-19CA0910015_011_011-20230419NULND
2023-04-19CA0910015_010_010-20230419NULND
2023-05-16CA0910015_003_003-20230516085022.00 pCi/L
2023-05-16CA0910015_010_010-202305160954ND
2023-05-16CA0910015_011_011-202305160850ND
2023-05-16CA0910015_002_002-20230516095432.67 pCi/L
2023-06-20CA0910015_010_010-202306200935ND
2023-06-20CA0910015_002_002-20230620093534.00 pCi/L
2023-06-20CA0910015_003_003-20230620085023.33 pCi/L
2023-06-20CA0910015_011_011-202306200850ND
2023-08-15CA0910015_010_010-202308151036ND
2023-08-15CA0910015_003_003-20230815102919.33 pCi/L
2023-08-15CA0910015_002_002-20230815103623.33 pCi/L
2023-08-15CA0910015_011_011-202308151029ND
2023-09-19CA0910015_010_010-202309190945ND
2023-09-19CA0910015_003_003-20230919085023.33 pCi/L
2023-09-19CA0910015_002_002-20230919094526.00 pCi/L
2023-09-19CA0910015_011_011-202309190850ND
2023-10-17CA0910015_002_002-20231017093030.00 pCi/L
2023-10-17CA0910015_003_003-20231017090021.33 pCi/L
2023-10-17CA0910015_010_010-202310170930ND
2023-10-17CA0910015_011_011-202310170900ND
2023-11-21CA0910015_011_011-202311211045ND
2023-11-21CA0910015_002_002-20231121090035.33 pCi/L
2023-11-21CA0910015_003_003-20231121104522.00 pCi/L
2023-11-21CA0910015_010_010-202311210900ND
2023-11-28CA0910015_001_001-20231128094511.33 pCi/L
2023-12-19CA0910015_002_002-20231219071532.00 pCi/L
2023-12-19CA0910015_010_010-202312190715ND