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EWG's Tap Water Database — 2021 UPDATE

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Cyanide

Parker WSD

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND130ND
2015ND50ND
2016ND40ND
2017ND20ND
2018N/A00N/A
2019N/A00N/A

ppb = parts per billion

State and national drinking water standards and health guidelines

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 Result
2014-05-07ND
2014-05-08ND
2014-06-12ND
2014-06-16ND
2014-06-19ND
2014-07-02ND
2014-07-17ND
2014-07-31ND
2014-08-14ND
2014-08-14ND
2014-08-21ND
2014-10-15ND
2014-10-22ND
2015-03-26ND
2015-06-10ND
2015-06-10ND
2015-08-26ND
2015-10-21ND
2016-01-28ND
2016-05-03ND
2016-07-14ND
2016-10-04ND
2017-06-08ND
2017-07-18ND