Know Your Environment. Protect Your Health.

Mercury (inorganic)

Cws-split Mountain Water System

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

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

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
2018-01-23CA1500407_005_005-201801231010ND
2018-01-23CA1500407_006_006-201801230950ND
2019-01-15CA1500407_005_005-201901151150ND
2019-01-15CA1500407_006_006-201901151132ND
2019-05-13CA1500407_002_002-201905130958ND
2020-01-22CA1500407_005_005-202001221450ND
2020-01-22CA1500407_006_006-202001221438ND
2020-02-11CA1500407_007_007-202002111247ND
2021-01-26CA1500407_006_006-202101261336ND
2021-01-26CA1500407_005_005-202101261344ND
2021-01-26CA1500407_006_006-202101261336ND
2022-01-18CA1500407_006_006-202201181111ND
2022-01-18CA1500407_005_005-202201181056ND
2023-01-26CA1500407_005_005-202301260926ND
2023-01-26CA1500407_006_006-202301260934ND
2023-02-23CA1500407_007_007-202302231300ND