Uranium
Cws - Upper Bodfish 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 5.78 pCi/L | 43 | 21 | ND - 23.12 pCi/L |
| 2019 | 7.43 pCi/L | 35 | 22 | ND - 24.00 pCi/L |
| 2020 | 7.53 pCi/L | 35 | 21 | ND - 24.70 pCi/L |
| 2021 | 7.73 pCi/L | 29 | 17 | ND - 24.00 pCi/L |
| 2022 | 7.94 pCi/L | 50 | 36 | ND - 22.00 pCi/L |
| 2023 | 8.79 pCi/L | 35 | 22 | ND - 27.50 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 |
|---|---|---|
| 2018-01-17 | CA1510026_006_006-201801171104 | 9.51 pCi/L |
| 2018-01-17 | CA1510026_007_007-201801171059 | ND |
| 2018-02-14 | CA1510026_006_006-201802141510 | 8.96 pCi/L |
| 2018-02-14 | CA1510026_007_007-201802141121 | ND |
| 2018-02-14 | CA1510026_004_004-201802141115 | 18.77 pCi/L |
| 2018-02-21 | CA1510026_005_005-201802211343 | 4.28 pCi/L |
| 2018-02-21 | CA1510026_007_007-201802211325 | ND |
| 2018-02-21 | CA1510026_004_004-201802211334 | 18.26 pCi/L |
| 2018-03-13 | CA1510026_006_006-201803131300 | 11.16 pCi/L |
| 2018-03-13 | CA1510026_007_007-201803131316 | ND |
| 2018-04-04 | CA1510026_007_007-201804041042 | ND |
| 2018-04-16 | CA1510026_006_006-201804161424 | 10.58 pCi/L |
| 2018-04-16 | CA1510026_007_007-201804161432 | ND |
| 2018-05-16 | CA1510026_005_005-201805161338 | 6.17 pCi/L |
| 2018-05-16 | CA1510026_004_004-201805161332 | 23.12 pCi/L |
| 2018-05-16 | CA1510026_006_006-201805161327 | 10.89 pCi/L |
| 2018-05-16 | CA1510026_007_007-201805161343 | ND |
| 2018-06-12 | CA1510026_007_007-201806121429 | ND |
| 2018-06-18 | CA1510026_007_007-201806181350 | ND |
| 2018-06-18 | CA1510026_006_006-201806181344 | 10.30 pCi/L |
| 2018-07-16 | CA1510026_006_006-201807161306 | 9.48 pCi/L |
| 2018-07-16 | CA1510026_007_007-201807161325 | ND |
| 2018-08-01 | CA1510026_007_007-201808011408 | ND |
| 2018-08-08 | CA1510026_007_007-201808081446 | ND |
| 2018-08-13 | CA1510026_004_004-201808131148 | 21.46 pCi/L |
| 2018-08-13 | CA1510026_005_005-201808131154 | 6.53 pCi/L |
| 2018-08-13 | CA1510026_007_007-201808131209 | ND |
| 2018-08-13 | CA1510026_DST_902-201808131227 | ND |
| 2018-08-13 | CA1510026_DST_901-201808131219 | ND |
| 2018-08-13 | CA1510026_006_006-201808131200 | 9.58 pCi/L |
| 2018-09-06 | CA1510026_007_007-201809061336 | ND |
| 2018-09-19 | CA1510026_006_006-201809191209 | 8.54 pCi/L |
| 2018-09-19 | CA1510026_007_007-201809191214 | ND |
| 2018-10-08 | CA1510026_007_007-201810081224 | ND |
| 2018-10-16 | CA1510026_006_006-201810161335 | 11.67 pCi/L |
| 2018-10-16 | CA1510026_007_007-201810161326 | ND |
| 2018-11-14 | CA1510026_004_004-201811141322 | 22.38 pCi/L |
| 2018-11-14 | CA1510026_005_005-201811141328 | 7.66 pCi/L |
| 2018-11-14 | CA1510026_007_007-201811141347 | ND |
| 2018-11-14 | CA1510026_006_006-201811141335 | 9.72 pCi/L |
| 2018-12-10 | CA1510026_007_007-201812101100 | ND |
| 2018-12-11 | CA1510026_007_007-201812111105 | ND |
| 2018-12-11 | CA1510026_006_006-201812111057 | 9.37 pCi/L |
| 2019-01-22 | CA1510026_007_007-201901221110 | ND |
| 2019-01-22 | CA1510026_006_006-201901221102 | 9.25 pCi/L |
| 2019-02-06 | CA1510026_004_004-201902061245 | 20.77 pCi/L |
| 2019-02-06 | CA1510026_005_005-201902061255 | 8.16 pCi/L |
| 2019-02-06 | CA1510026_007_007-201902061227 | ND |
| 2019-02-20 | CA1510026_006_006-201902200945 | 9.07 pCi/L |
| 2019-02-20 | CA1510026_007_007-201902200950 | ND |
| 2019-02-20 | CA1510026_005_005-201902200940 | 7.98 pCi/L |
| 2019-02-20 | CA1510026_004_004-201902200935 | 22.36 pCi/L |
| 2019-03-27 | CA1510026_006_006-201903271040 | 7.65 pCi/L |
| 2019-03-27 | CA1510026_007_007-201903271045 | ND |
| 2019-04-09 | CA1510026_007_007-201904091343 | ND |
| 2019-04-09 | CA1510026_006_006-201904091320 | 8.71 pCi/L |
| 2019-04-17 | CA1510026_006_006-201904170940 | 8.37 pCi/L |
| 2019-04-17 | CA1510026_007_007-201904170950 | ND |
| 2019-05-15 | CA1510026_006_006-201905151108 | 9.80 pCi/L |
| 2019-05-15 | CA1510026_007_007-201905151112 | ND |
| 2019-05-15 | CA1510026_004_004-201905151102 | 24.00 pCi/L |
| 2019-05-15 | CA1510026_005_005-201905151105 | 9.20 pCi/L |
| 2019-06-19 | CA1510026_006_006-201906191332 | 10.61 pCi/L |
| 2019-06-19 | CA1510026_007_007-201906191334 | ND |
| 2019-07-22 | CA1510026_007_007-201907221120 | ND |
| 2019-07-22 | CA1510026_006_006-201907221115 | 8.15 pCi/L |
| 2019-08-28 | CA1510026_006_006-201908281143 | 10.00 pCi/L |
| 2019-08-28 | CA1510026_004_004-201908281137 | 21.42 pCi/L |
| 2019-08-28 | CA1510026_005_005-201908281140 | 7.53 pCi/L |
| 2019-08-28 | CA1510026_007_007-201908281147 | ND |
| 2019-09-11 | CA1510026_006_006-201909110940 | 13.00 pCi/L |
| 2019-09-11 | CA1510026_007_007-201909110950 | ND |
| 2019-10-28 | CA1510026_006_006-201910281342 | 9.47 pCi/L |
| 2019-10-28 | CA1510026_007_007-201910281336 | ND |
| 2019-11-19 | CA1510026_005_005-201911191348 | 5.99 pCi/L |
| 2019-11-19 | CA1510026_007_007-201911191352 | ND |
| 2019-11-19 | CA1510026_006_006-201911191350 | 12.73 pCi/L |
| 2019-11-19 | CA1510026_004_004-201911191345 | 15.94 pCi/L |
| 2020-01-22 | CA1510026_007_007-202001221134 | ND |
| 2020-01-22 | CA1510026_006_006-202001221128 | 12.35 pCi/L |
| 2020-02-04 | CA1510026_007_007-202002041250 | ND |
| 2020-02-04 | CA1510026_006_006-202002041257 | 13.74 pCi/L |
| 2020-02-04 | CA1510026_004_004-202002041303 | 24.23 pCi/L |
| 2020-02-04 | CA1510026_005_005-202002041310 | 6.86 pCi/L |
| 2020-03-16 | CA1510026_007_007-202003161209 | ND |
| 2020-03-16 | CA1510026_006_006-202003161212 | 12.45 pCi/L |
| 2020-04-01 | CA1510026_006_006-202004011345 | 11.32 pCi/L |
| 2020-04-01 | CA1510026_007_007-202004011333 | ND |
| 2020-04-15 | CA1510026_007_007-202004150925 | ND |
| 2020-04-15 | CA1510026_006_006-202004150931 | 13.00 pCi/L |
| 2020-06-08 | CA1510026_007_007-202006081115 | ND |
| 2020-06-08 | CA1510026_006_006-202006081125 | 11.99 pCi/L |
| 2020-06-23 | CA1510026_006_006-202006230818 | 13.00 pCi/L |
| 2020-06-23 | CA1510026_007_007-202006230825 | ND |
| 2020-07-20 | CA1510026_007_007-202007201303 | ND |
| 2020-07-20 | CA1510026_006_006-202007201255 | 10.99 pCi/L |
| 2020-08-05 | CA1510026_006_006-202008051150 | 10.80 pCi/L |
| 2020-08-05 | CA1510026_007_007-202008051121 | ND |
| 2020-08-05 | CA1510026_005_005-202008051201 | 6.00 pCi/L |
| 2020-08-18 | CA1510026_004_004-202008181007 | 24.70 pCi/L |
| 2020-08-18 | CA1510026_007_007-202008180955 | ND |
| 2020-08-18 | CA1510026_006_006-202008181002 | 11.90 pCi/L |
| 2020-08-18 | CA1510026_005_005-202008181011 | 6.60 pCi/L |
| 2020-09-09 | CA1510026_006_006-202009090751 | 13.00 pCi/L |
| 2020-09-09 | CA1510026_007_007-202009090746 | ND |
| 2020-10-20 | CA1510026_007_007-202010201139 | ND |
| 2020-10-20 | CA1510026_006_006-202010201129 | 10.90 pCi/L |
| 2020-11-12 | CA1510026_004_004-202011121142 | 21.80 pCi/L |
| 2020-11-12 | CA1510026_005_005-202011121213 | 6.30 pCi/L |
| 2020-11-12 | CA1510026_007_007-202011121218 | ND |
| 2020-11-12 | CA1510026_006_006-202011121136 | 11.60 pCi/L |
| 2020-12-09 | CA1510026_006_006-202012091112 | 10.10 pCi/L |
| 2020-12-09 | CA1510026_007_007-202012091118 | ND |
| 2021-01-20 | CA1510026_007_007-202101201236 | ND |
| 2021-01-20 | CA1510026_006_006-202101201241 | 11.00 pCi/L |
| 2021-02-11 | CA1510026_004_004-202102111253 | 22.00 pCi/L |
| 2021-02-11 | CA1510026_006_006-202102111249 | 11.00 pCi/L |
| 2021-02-11 | CA1510026_005_005-202102111257 | 6.60 pCi/L |
| 2021-02-11 | CA1510026_007_007-202102111244 | ND |
| 2021-03-02 | CA1510026_006_006-202103020823 | 11.00 pCi/L |
| 2021-03-02 | CA1510026_007_007-202103020814 | ND |
| 2021-04-07 | CA1510026_007_007-202104071326 | ND |
| 2021-05-05 | CA1510026_004_004-202105051358 | 20.00 pCi/L |
| 2021-05-05 | CA1510026_005_005-202105051402 | 6.00 pCi/L |
| 2021-06-08 | CA1510026_007_007-202106081221 | ND |
| 2021-07-13 | CA1510026_007_007-202107131158 | ND |
| 2021-07-13 | CA1510026_006_006-202107131143 | 12.00 pCi/L |
| 2021-07-13 | CA1510026_007_007-202107131158 | ND |
| 2021-08-03 | CA1510026_007_007-202108031347 | ND |
| 2021-08-03 | CA1510026_006_006-202108031342 | 13.00 pCi/L |
| 2021-08-05 | CA1510026_004_004-202108051342 | 24.00 pCi/L |
| 2021-08-05 | CA1510026_005_005-202108051347 | 8.30 pCi/L |
| 2021-09-09 | CA1510026_006_006-202109091425 | 11.00 pCi/L |
| 2021-09-09 | CA1510026_007_007-202109091440 | ND |
| 2021-10-07 | CA1510026_007_007-202110071434 | ND |
| 2021-10-07 | CA1510026_006_006-202110071442 | 13.00 pCi/L |
| 2021-11-09 | CA1510026_007_007-202111090830 | ND |
| 2021-11-09 | CA1510026_004_004-202111090814 | 24.00 pCi/L |
| 2021-11-09 | CA1510026_005_005-202111090820 | 8.20 pCi/L |
| 2021-11-09 | CA1510026_006_006-202111090759 | 12.00 pCi/L |
| 2021-12-14 | CA1510026_006_006-202112141045 | 11.00 pCi/L |
| 2021-12-14 | CA1510026_007_007-202112141050 | ND |
| 2022-01-11 | CA1510026_004_004-202201111011 | 21.00 pCi/L |
| 2022-01-11 | CA1510026_005_005-202201111017 | 6.50 pCi/L |
| 2022-01-18 | CA1510026_004_004-202201181416 | 20.00 pCi/L |
| 2022-01-18 | CA1510026_005_005-202201181427 | 7.10 pCi/L |
| 2022-01-18 | CA1510026_007_007-202201181324 | ND |
| 2022-01-18 | CA1510026_006_006-202201181339 | 12.00 pCi/L |
| 2022-02-25 | CA1510026_006_006-202202250905 | 8.90 pCi/L |
| 2022-02-25 | CA1510026_004_004-202202250916 | 20.00 pCi/L |
| 2022-02-25 | CA1510026_005_005-202202250921 | 7.60 pCi/L |
| 2022-02-25 | CA1510026_007_007-202202250858 | ND |
| 2022-03-08 | CA1510026_005_005-202203081123 | 6.90 pCi/L |
| 2022-03-08 | CA1510026_004_004-202203081120 | 19.00 pCi/L |
| 2022-03-15 | CA1510026_006_006-202203150927 | 10.60 pCi/L |
| 2022-03-15 | CA1510026_007_007-202203150932 | ND |
| 2022-04-06 | CA1510026_007_007-202204061425 | ND |
| 2022-04-06 | CA1510026_006_006-202204061420 | 11.40 pCi/L |
| 2022-04-19 | CA1510026_006_006-202204191317 | 10.20 pCi/L |
| 2022-04-19 | CA1510026_007_007-202204191312 | ND |
| 2022-04-19 | CA1510026_004_004-202204191302 | 22.00 pCi/L |
| 2022-04-19 | CA1510026_005_005-202204191306 | 8.30 pCi/L |
| 2022-05-03 | CA1510026_004_004-202205031159 | 12.20 pCi/L |
| 2022-05-03 | CA1510026_005_005-202205031204 | 8.40 pCi/L |
| 2022-05-03 | CA1510026_007_007-202205031143 | ND |
| 2022-05-03 | CA1510026_005_005-202205031204 | 8.00 pCi/L |
| 2022-05-03 | CA1510026_006_006-202205031153 | 8.30 pCi/L |
| 2022-05-03 | CA1510026_007_007-202205031143 | ND |
| 2022-05-03 | CA1510026_004_004-202205031159 | 12.60 pCi/L |
| 2022-05-03 | CA1510026_006_006-202205031153 | 8.40 pCi/L |
| 2022-06-01 | CA1510026_007_007-202206011143 | ND |
| 2022-06-01 | CA1510026_006_006-202206011149 | 8.60 pCi/L |
| 2022-06-01 | CA1510026_006_006-202206011149 | 8.70 pCi/L |
| 2022-07-13 | CA1510026_007_007-202207131404 | ND |
| 2022-07-13 | CA1510026_006_006-202207131349 | 8.80 pCi/L |
| 2022-07-13 | CA1510026_006_006-202207131349 | 8.80 pCi/L |
| 2022-08-10 | CA1510026_006_006-202208101400 | 8.60 pCi/L |
| 2022-08-10 | CA1510026_005_005-202208101411 | 7.60 pCi/L |
| 2022-08-10 | CA1510026_004_004-202208101406 | 15.00 pCi/L |
| 2022-08-10 | CA1510026_005_005-202208101411 | 7.80 pCi/L |
| 2022-08-10 | CA1510026_006_006-202208101400 | 8.90 pCi/L |
| 2022-08-10 | CA1510026_007_007-202208101424 | ND |
| 2022-09-14 | CA1510026_006_006-202209140902 | 10.00 pCi/L |
| 2022-09-14 | CA1510026_007_007-202209140910 | ND |
| 2022-10-11 | CA1510026_006_006-202210111327 | 8.30 pCi/L |
| 2022-10-11 | CA1510026_007_007-202210111320 | ND |
| 2022-11-08 | CA1510026_004_004-202211081309 | 16.00 pCi/L |
| 2022-11-08 | CA1510026_006_006-202211081301 | 12.00 pCi/L |
| 2022-11-08 | CA1510026_007_007-202211081254 | ND |
| 2022-11-08 | CA1510026_005_005-202211081315 | 9.30 pCi/L |
| 2022-12-06 | CA1510026_006_006-202212061122 | 9.20 pCi/L |
| 2022-12-06 | CA1510026_007_007-202212061115 | ND |
| 2023-01-18 | CA1510026_007_007-202301181102 | ND |
| 2023-01-18 | CA1510026_006_006-202301181052 | 10.00 pCi/L |
| 2023-02-01 | CA1510026_007_007-202302011515 | ND |
| 2023-02-06 | CA1510026_004_004-202302061211 | 22.00 pCi/L |
| 2023-02-06 | CA1510026_005_005-202302061217 | 10.00 pCi/L |
| 2023-02-06 | CA1510026_007_007-202302061158 | ND |
| 2023-02-06 | CA1510026_006_006-202302061206 | 10.80 pCi/L |
| 2023-02-06 | CA1510026_005_005-202302061217 | 10.10 pCi/L |
| 2023-02-06 | CA1510026_006_006-202302061206 | 10.60 pCi/L |
| 2023-03-06 | CA1510026_006_006-202303060954 | 14.40 pCi/L |
| 2023-03-06 | CA1510026_007_007-202303061010 | ND |
| 2023-04-11 | CA1510026_006_006-202304111356 | 14.50 pCi/L |
| 2023-04-12 | CA1510026_007_007-202304121220 | ND |
| 2023-05-08 | CA1510026_005_005-202305081144 | 7.60 pCi/L |
| 2023-05-08 | CA1510026_006_006-202305081127 | 12.70 pCi/L |
| 2023-05-08 | CA1510026_007_007-202305081135 | ND |
| 2023-05-08 | CA1510026_004_004-202305081140 | 23.20 pCi/L |
| 2023-06-06 | CA1510026_006_006-202306061147 | 13.50 pCi/L |
| 2023-06-06 | CA1510026_007_007-202306061152 | ND |
| 2023-07-11 | CA1510026_007_007-202307111418 | ND |
| 2023-07-12 | CA1510026_006_006-202307121145 | 13.30 pCi/L |
| 2023-08-09 | CA1510026_006_006-202308091323 | 12.40 pCi/L |
| 2023-08-09 | CA1510026_004_004-202308091333 | 23.60 pCi/L |
| 2023-08-09 | CA1510026_007_007-202308091347 | ND |
| 2023-08-09 | CA1510026_005_005-202308091336 | 6.00 pCi/L |
| 2023-09-05 | CA1510026_007_007-202309051311 | ND |
| 2023-09-05 | CA1510026_006_006-202309051303 | 14.00 pCi/L |
| 2023-10-03 | CA1510026_006_006-202310031055 | 14.70 pCi/L |
| 2023-10-03 | CA1510026_007_007-202310031050 | ND |
| 2023-11-06 | CA1510026_006_006-202311061436 | 14.30 pCi/L |
| 2023-11-13 | CA1510026_004_004-202311131135 | 27.50 pCi/L |
| 2023-11-13 | CA1510026_007_007-202311131130 | ND |
| 2023-11-13 | CA1510026_005_005-202311131140 | 8.60 pCi/L |
| 2023-12-13 | CA1510026_006_006-202312131410 | 14.00 pCi/L |
| 2023-12-13 | CA1510026_007_007-202312131400 | ND |