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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

Carson City Public Works

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.

 

34

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND110ND
2013ND50ND
2014ND40ND
2015ND60ND
2016ND30ND
2017ND50ND

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
2012-06-19201206210314-IND
2012-06-21201206220321-IND
2012-06-25201206270244-IND
2012-06-25201206270216-IND
2012-07-11201207130064-IND
2012-08-08201208100396-IND
2012-09-18201209200453-IND
2012-10-02201210030297-IND
2012-10-22201210230058-IND
2012-11-13201211150453-IND
2012-12-19201212200202ND
2013-06-18201306190582-IND
2013-06-26201306270194-IND
2013-07-18201307200001-IND
2013-09-09201309100461-IND
2013-09-25201309260254-IND
2014-05-27201405280593-NND
2014-07-01201407020365ND
2014-07-01201407020367ND
2014-07-01201407020366ND
2015-06-29201506300124-IOCND
2015-06-29201506300177-IOCND
2015-07-15201507160255ND
2015-08-10201508110263ND
2015-09-15201509020134ND
2015-09-24201509250182ND
2016-06-22201606230265ND
2016-06-22201606230267ND
2016-08-10201608110453ND
2017-05-15201705160571ND
2017-05-16201705170304ND
2017-05-25201705260596ND
2017-06-13201706140424ND
2017-07-19201707200814ND