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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

Johnson Utilities

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND80ND
2013N/A00N/A
2014ND10ND
2015ND80ND
2016N/A00N/A
2017N/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 Lab ID Result
2012-01-23201201240135IND
2012-01-23201201240134IND
2012-01-23201201240133IND
2012-01-23201201240131IND
2012-01-23201201240130IND
2012-01-23201201240129IND
2012-01-23201201240128IND
2012-01-23201201240127IND
2014-12-04201412050158IND
2015-03-04201503040391IND
2015-03-04201503040390IND
2015-03-04201503040389IND
2015-03-04201503040388IND
2015-03-04201503040387IND
2015-06-17201506170544IND
2015-10-15201510150153IND
2015-10-15201510150154IND