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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

Water District 1 of Johnson County

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
2012ND30ND
20137.50 ppb41ND - 30.0 ppb
2014ND30ND
2015N/A00N/A
2016ND30ND
2017ND30ND

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
2012-05-22MAY2012-IOC-TP2ND
2012-05-22MAY2012-IOC-TP3ND
2012-05-30MAY2012-IOC-TP1ND
2013-05-01MAY2013-OC-TP1ND
2013-05-01MAY2013-OC-TP2ND
2013-05-01MAY2013-OC-TP330.0 ppb
2013-07-08JUL2013-OC-TP1ND
2014-05-07MAY2014-IOC-TP3ND
2014-05-07MAY2014-IOC-TP2ND
2014-05-07MAY2014-IOC-TP1ND
2016-05-17MAY2016--TP2ND
2016-05-17MAY2016--TP3ND
2016-06-20JUN2016--TP1ND
2017-05-16MAY2017--TP2ND
2017-05-16MAY2017--TP3ND
2017-07-12JUL2017--TP1ND