Know Your Environment. Protect Your Health.

Cyanide

Wallingford Water Department

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
2018ND40ND
2019ND20ND
2020ND20ND
2021ND40ND
2022ND20ND
2023ND20ND

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
2018-03-12CA01121ND
2018-03-12CA01122ND
2018-03-12CA01120ND
2018-07-17CA91980-02ND
2019-03-06CC62592-01ND
2019-03-06CC62593ND
2020-03-02CF41927ND
2020-03-02CF41926ND
2021-01-06CH41480ND
2021-01-06CH41478ND
2021-01-06CH41481ND
2021-02-03CH55990ND
2022-02-02CK28223ND
2022-02-02CK28222ND
2023-02-08CN38363ND
2023-02-08CN38364ND