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EWG's Tap Water Database — 2021 UPDATE

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Cyanide

Farmerville Water System

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND140ND
2016N/A00N/A
2017N/A00N/A
2018ND140ND
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 Lab ID Result
2015-07-2135198892004ND
2015-07-2135198892002ND
2015-07-2135198892001ND
2015-07-2135198892003ND
2015-07-2135198892004ND
2015-07-2135198892005ND
2015-07-2135198892003ND
2015-07-2135198892002ND
2015-07-2135198892001ND
2015-07-2135198892005ND
2015-08-2435204447004ND
2015-08-2435204447003ND
2015-08-2435204447003ND
2015-08-2435204447004ND
2018-04-2535388787005ND
2018-04-2535388787004ND
2018-04-2535388787003ND
2018-04-2535388787002ND
2018-04-2535388787001ND
2018-04-2535388787002ND
2018-04-2535388787003ND
2018-04-2535388787004ND
2018-04-2535388787005ND
2018-04-2535388787001ND
2018-05-1535392914001ND
2018-05-1535392914002ND
2018-05-1535392914001ND
2018-05-1535392914002ND