Know Your Environment. Protect Your Health.

Mercury (inorganic)

Western Cass Water Supply Corporation

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND30ND
2020ND10ND
2021ND20ND
2022ND30ND
2023ND10ND

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
2018-03-08Q1809687016ND
2018-03-08Q1809687017ND
2019-05-02Q1918236012ND
2019-05-02Q1918236013ND
2019-05-02Q1918236014ND
2020-03-19Q2011997016ND
2021-10-25Q2129911020ND
2021-10-25Q2129911027ND
2022-04-14Q2211593001ND
2022-04-14Q2211593002ND
2022-11-16Q2234548004ND
2023-08-01Q2331111011ND