Mercury (inorganic)
Regional Water Authority
Mercury is a potent neurotoxin that also damages the kidneys and other internal organs. Mercury enters drinking water from industrial pollution, mining wastes and coal-fired power plants.
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 | ND | 27 | 0 | ND |
| 2019 | ND | 26 | 0 | ND |
| 2020 | ND | 25 | 0 | ND |
| 2021 | ND | 29 | 0 | ND |
| 2022 | ND | 15 | 0 | ND |
| 2023 | ND | 14 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 1.2 ppb
The EWG Health Guideline of 1.2 ppb for mercury (inorganic) 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. This health guideline protects against harm to internal organs.
EPA Maximum Contaminant
Level (MCL): 2 ppb
The legal limit for inorganic mercury, established in 1991, was based on toxicity studies conducted in laboratory animals in the 1970s and 1980s. This limit does not include any additional consideration of children’s health.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-12 | IOC1 200489766 | ND |
| 2018-03-12 | IOCR 200489760 | ND |
| 2018-03-12 | IOCR 200489758 | ND |
| 2018-03-12 | IOCR 200489759 | ND |
| 2018-03-12 | IOCR 200489767 | ND |
| 2018-03-14 | IOCR 200489911 | ND |
| 2018-03-14 | IOC1 200489867 | ND |
| 2018-03-14 | IOC1 200489870 | ND |
| 2018-03-14 | IOC1 200489868 | ND |
| 2018-03-14 | IOC1 200489884 | ND |
| 2018-03-14 | IOC1 200489885 | ND |
| 2018-03-14 | IOC1 200489871 | ND |
| 2018-03-14 | IOC1 200489913 | ND |
| 2018-03-14 | IOC1 200489914 | ND |
| 2018-03-14 | IOCR 200489898 | ND |
| 2018-03-14 | IOCR 200489900 | ND |
| 2018-03-14 | IOCR 200489896 | ND |
| 2018-03-14 | IOCR 200489912 | ND |
| 2018-03-14 | IOCR 200489886 | ND |
| 2018-03-14 | IOCR 200489887 | ND |
| 2018-03-14 | IOCR 200489872 | ND |
| 2018-03-14 | IOCR 200489897 | ND |
| 2018-03-15 | IOCR 200490062 | ND |
| 2018-03-15 | IOCR 200490063 | ND |
| 2018-12-20 | IOC1 200516694 | ND |
| 2018-12-20 | IOCR 200516697 | ND |
| 2018-12-26 | IOCR 200516801 | ND |
| 2019-03-18 | IOC1 200524895 | ND |
| 2019-03-18 | IOCR 200524896 | ND |
| 2019-03-18 | IOCR 200524903 | ND |
| 2019-03-18 | IOCR 200524901 | ND |
| 2019-03-18 | IOCR 200524902 | ND |
| 2019-03-18 | IOCR 200524905 | ND |
| 2019-03-18 | IOCR 200524900 | ND |
| 2019-03-19 | IOCR 200525095 | ND |
| 2019-03-19 | IOC1 200525057 | ND |
| 2019-03-19 | IOC1 200525060 | ND |
| 2019-03-19 | IOC1 200525058 | ND |
| 2019-03-19 | IOC1 200525059 | ND |
| 2019-03-19 | IOC1 200525077 | ND |
| 2019-03-19 | IOC1 200525078 | ND |
| 2019-03-19 | IOC1 200525061 | ND |
| 2019-03-19 | IOC1 200525097 | ND |
| 2019-03-19 | IOC1 200525098 | ND |
| 2019-03-19 | IOCR 200525065 | ND |
| 2019-03-19 | IOCR 200525066 | ND |
| 2019-03-19 | IOCR 200525064 | ND |
| 2019-03-19 | IOCR 200525096 | ND |
| 2019-03-19 | IOCR 200525079 | ND |
| 2019-03-19 | IOCR 200525080 | ND |
| 2019-03-19 | IOCR 200525062 | ND |
| 2019-05-08 | IOC1 200531297 | ND |
| 2019-05-08 | IOCR 200531303 | ND |
| 2020-02-10 | IOC1 200565460 | ND |
| 2020-02-10 | IOCR 200565461 | ND |
| 2020-02-10 | IOCR 200565469 | ND |
| 2020-02-10 | IOCR 200565466 | ND |
| 2020-02-10 | IOCR 200565467 | ND |
| 2020-02-10 | IOCR 200565470 | ND |
| 2020-02-11 | IOC1 200565624 | ND |
| 2020-02-11 | IOC1 200565627 | ND |
| 2020-02-11 | IOC1 200565626 | ND |
| 2020-02-11 | IOC1 200565593 | ND |
| 2020-02-11 | IOC1 200565625 | ND |
| 2020-02-11 | IOC1 200565594 | ND |
| 2020-02-11 | IOC1 200565628A | ND |
| 2020-02-11 | IOCR 200565632 | ND |
| 2020-02-11 | IOCR 200565633 | ND |
| 2020-02-11 | IOCR 200565631 | ND |
| 2020-02-11 | IOC1 200565628 | ND |
| 2020-02-11 | IOCR 200565595 | ND |
| 2020-02-11 | IOCR 200565596 | ND |
| 2020-02-11 | IOCR 200565629 | ND |
| 2020-02-12 | IOCR 200565847 | ND |
| 2020-02-12 | IOCR 200565848 | ND |
| 2020-08-10 | IOCR 200585597 | ND |
| 2020-08-11 | IOCR 200585735 | ND |
| 2020-08-11 | IOCR 200585736 | ND |
| 2021-02-08 | IOCR 200605858 | ND |
| 2021-02-08 | IOCR 200605854 | ND |
| 2021-02-08 | IOCR 200605856 | ND |
| 2021-02-08 | IOCR 200605852 | ND |
| 2021-02-08 | IOCR 200605855 | ND |
| 2021-02-09 | IOC1 200606114 | ND |
| 2021-02-09 | IOC1 200606111 | ND |
| 2021-02-09 | IOC1 200606110 | ND |
| 2021-02-09 | IOC1 200606109 | ND |
| 2021-02-09 | IOC1 200605956 | ND |
| 2021-02-09 | IOC1 200605886 | ND |
| 2021-02-09 | IOC1 200605888 | ND |
| 2021-02-09 | IOC1 200606116 | ND |
| 2021-02-09 | IOC1 200605959 | ND |
| 2021-02-09 | IOC1 200605933 | ND |
| 2021-02-09 | IOCR 200606115 | ND |
| 2021-02-09 | IOCR 200606112 | ND |
| 2021-02-09 | IOCR 200606113 | ND |
| 2021-02-09 | IOCR 200605957 | ND |
| 2021-02-09 | IOCR 200605958 | ND |
| 2021-02-09 | IOCR 200605931 | ND |
| 2021-02-09 | IOCR 200605887 | ND |
| 2021-02-09 | IOCR 200605960 | ND |
| 2021-02-09 | IOCR 200605889 | ND |
| 2021-02-09 | IOCR 200606117 | ND |
| 2021-02-10 | IOCR 200606359 | ND |
| 2021-02-10 | IOCR 200606356 | ND |
| 2021-02-17 | IOCR 200606910 | ND |
| 2021-02-17 | IOC1 200606909 | ND |
| 2022-02-15 | E300145541 300145548 | ND |
| 2022-02-15 | E300145532 300145539 | ND |
| 2022-02-15 | E300145523 300145530 | ND |
| 2022-02-15 | E300145514 300145521 | ND |
| 2022-02-15 | E300146276 300146283 | ND |
| 2022-02-15 | E300145647 300145654 | ND |
| 2022-02-15 | E300145667 300145674 | ND |
| 2022-02-15 | E300145550 300145557 | ND |
| 2022-02-15 | E300145575 300145582 | ND |
| 2022-02-15 | E300145699 300145706 | ND |
| 2022-02-15 | E300145718 300145725 | ND |
| 2022-02-15 | I300145657 300145665 | ND |
| 2022-02-15 | I300145585 300145593 | ND |
| 2022-02-15 | I300145677 300145685 | ND |
| 2022-02-15 | I300145560 300145568 | ND |
| 2023-02-06 | E300305466 300305499 | ND |
| 2023-02-07 | E300305797 300305804 | ND |
| 2023-02-07 | I300305807 300305815 | ND |
| 2023-02-14 | E300309461 300309468 | ND |
| 2023-02-14 | E300309762 300309769 | ND |
| 2023-02-14 | E300309452 300309459 | ND |
| 2023-02-14 | E300309097 300309104 | ND |
| 2023-02-14 | E300309470 300309477 | ND |
| 2023-02-14 | E300309495 300309502 | ND |
| 2023-02-14 | E300309531 300309538 | ND |
| 2023-02-14 | E300309550 300309557 | ND |
| 2023-02-14 | I300309505 300309513 | ND |
| 2023-02-14 | I300309107 300309115 | ND |
| 2023-02-14 | I300309480 300309488 | ND |