Know Your Environment. Protect Your Health.

Cyanide

Walnut Grove Utilities

Cyanide is a toxic chemical that causes central nervous system and thyroid toxicity. Water contamination is generally the result of metal mining and chemical industry waste, runoff from agriculture and road salts used for melting ice.

 

28

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
2022ND100ND
2023ND80ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 150 ppb

The EWG Health Guideline of 150 ppb for cyanide 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 the brain and nervous system.

EPA Maximum Contaminant
Level (MCL): 200 ppb

The legal limit for cyanide, established in 1992, was based on a 1955 toxicity study conducted in laboratory animals. 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
2022-03-08810-17576-1BND
2022-03-08810-17508-1BND
2022-03-08810-17505-1BND
2022-03-09FWC0111AND
2022-03-09810-18451-1BND
2022-03-09810-18448-1AND
2022-03-14FWC0176-01IND
2022-03-23810-18980-1IND
2022-05-16FWE0091-01AND
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