Know Your Environment. Protect Your Health.

Cyanide

Metropolitan District Commission

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.

 

42

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND70ND
2019ND70ND
2020ND70ND
2021ND70ND
2022ND70ND
2023ND70ND

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
2018-07-18CA93877ND
2018-07-18CA93878ND
2018-07-18CA93875ND
2018-07-18CA93874ND
2018-07-18CA93873ND
2018-07-18CA93870ND
2018-07-18CA93876ND
2019-10-09CE39276ND
2019-10-09CE39273ND
2019-10-09CE39274ND
2019-10-09CE39275ND
2019-10-09CE39269ND
2019-10-09CE39270ND
2019-10-09CE39268ND
2020-12-08IOC1 200600637ND
2020-12-08IOC1 200600611ND
2020-12-08IOCR 200600614ND
2020-12-08IOCR 200600615ND
2020-12-08IOCR 200600616ND
2020-12-08IOCR 200600617ND
2020-12-09IOC1 200600603ND
2021-11-23E300107450 300107455ND
2021-11-23I300107476 300107481ND
2021-11-23E300107451 300107461ND
2021-11-29E300109635 300109641ND
2021-11-29I300109610 300109615ND
2021-11-30I300109649 300109655ND
2021-11-30I300109650 300109661ND
2022-12-08I300283837 300283844ND
2022-12-08300283822 300283829BND
2022-12-15E300287100 300287105ND
2022-12-15I300287081 300287088ND
2022-12-15I300287109 300287114ND
2022-12-15E300287072 300287077ND
2022-12-15E300287053 300287058ND
2023-12-05E300456248 300456252ND
2023-12-05I300456268 300456273ND
2023-12-05I300456261 300456266ND
2023-12-05I300456281 300456286ND
2023-12-06E300456222 300456226ND
2023-12-06E300456228 300456232ND
2023-12-06I300456234 300456239ND