Know Your Environment. Protect Your Health.

Mercury (inorganic)

Walnut Grove 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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND60ND
2020N/A00N/A
2021ND20ND
2022ND80ND
2023ND80ND

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
2018-08-15292292-2018-DWIND
2018-10-16295670-2018-DWND
2019-02-26301436-2019-DWND
2019-02-26301437-2019-DWIND
2019-03-05301698-2019-DWND
2019-03-05301699-2019-DWIND
2019-03-12302100-2019-DWND
2019-03-12302099-2019-DWND
2021-07-217380944003ND
2021-09-077387721001ND
2022-03-08810-17505-1BND
2022-03-08810-17576-1BND
2022-03-08810-17508-1BND
2022-03-09FWC0111AND
2022-03-09810-18451-1BND
2022-03-09810-18448-1AND
2022-03-23810-18980-1IND
2022-05-23FWE0087-01ND
2023-02-15FXB0429ND
2023-04-04FXC0507-01ND
2023-04-04FXC0516-01ND
2023-04-05FXC0500-01ND
2023-04-05FXC0542-01ND
2023-04-05FXC0553-01ND
2023-04-05FXC0559-01ND
2023-07-31FXF0576-01ND