Know Your Environment. Protect Your Health.

Cyanide

Cws-split Mountain Water System

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.

 

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: 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
2018-01-23CA1500407_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_006_006-202001221438ND
2020-01-22CA1500407_005_005-202001221450ND
2020-02-11CA1500407_007_007-202002111247ND
2021-01-26CA1500407_005_005-202101261344ND
2021-01-26CA1500407_006_006-202101261336ND
2021-01-26CA1500407_006_006-202101261336ND
2022-01-18CA1500407_005_005-202201181056ND
2022-01-18CA1500407_006_006-202201181111ND
2023-01-26CA1500407_005_005-202301260926ND
2023-02-07CA1500407_006_006-202302071432ND
2023-02-23CA1500407_007_007-202302231300ND