Know Your Environment. Protect Your Health.

Mercury (inorganic)

Metropolitan District Commission

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.

 

41

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND60ND
2019ND70ND
2020ND70ND
2021ND70ND
2022ND70ND
2023ND70ND

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
2018-07-18CA93877ND
2018-07-18CA93878ND
2018-07-18CA93875ND
2018-07-18CA93874ND
2018-07-18CA93870ND
2018-07-18CA93876ND
2019-10-09CE39274ND
2019-10-09CE39273ND
2019-10-09CE39276ND
2019-10-09CE39275ND
2019-10-09CE39269ND
2019-10-09CE39270ND
2019-10-09CE39268ND
2020-12-08IOC1 200600637ND
2020-12-08IOC1 200600611ND
2020-12-08IOCR 200600614ND
2020-12-08IOCR 200600615ND
2020-12-08IOCR 200600616ND
2020-12-08IOCR 200600617ND
2020-12-09IOC1 200600603ND
2021-11-23E300107450 300107456ND
2021-11-23I300107476 300107482ND
2021-11-23E300107451 300107462ND
2021-11-29E300109635 300109642ND
2021-11-29I300109610 300109616ND
2021-11-30I300109649 300109656ND
2021-11-30I300109650 300109662ND
2022-12-08I300283837 300283845ND
2022-12-08300283822 300283830BND
2022-12-15E300287100 300287106ND
2022-12-15I300287081 300287089ND
2022-12-15I300287109 300287115ND
2022-12-15E300287072 300287078ND
2022-12-15E300287053 300287059ND
2023-12-05E300456248 300456253ND
2023-12-05I300456268 300456274ND
2023-12-05I300456261 300456267ND
2023-12-05I300456281 300456287ND
2023-12-06E300456222 300456227ND
2023-12-06E300456228 300456233ND
2023-12-06I300456234 300456240ND