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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

City of Surprise - Mountain Vista

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
2012ND40ND
2013ND40ND
2014ND40ND
2015ND30ND
2016ND50ND
2017ND40ND

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 Lab ID Result
2012-01-262012012-04IND
2012-01-262012012-03IND
2012-01-262012012-02IND
2012-01-262012012-01IND
2013-01-233011767-04IND
2013-01-233011767-03IND
2013-01-233011767-020IND
2013-01-233011767-01IND
2014-01-224011817-01IND
2014-01-224011817-04IND
2014-01-224011817-03IND
2014-01-224011817-02IND
2015-01-215011694-04IND
2015-01-215011694-02IND
2015-01-215011694-01IND
2016-01-256012035-04TTND
2016-01-256012035-03TTND
2016-01-256012035-03IND
2016-01-256012035-02TTND
2016-01-256012035-01TTND
2017-01-307012591-01ND
2017-01-307012591-04CND
2017-01-307012591-03CND
2017-01-307012591-02CND