Know Your Environment. Protect Your Health.

Mercury (inorganic)

Clark Public Utilities

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021ND30ND
2022ND140ND
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
2021-06-294136309ND
2021-06-294136308ND
2021-08-024171193ND
2022-03-314266325ND
2022-07-074329452ND
2022-07-074329453ND
2022-07-074329454ND
2022-07-284328491ND
2022-07-284329448ND
2022-08-034328492ND
2022-08-034329441ND
2022-08-034329440ND
2022-08-044329461ND
2022-08-044329471ND
2022-08-044329468ND
2022-08-044328488ND
2022-08-164364181ND
2023-04-064439682ND
2023-06-014474461ND
2023-09-194531983ND