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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

Three Valleys Municipal Water District

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.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND20ND
2014ND30ND
2015ND30ND
2016ND30ND
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
2012-03-213761-002-1100ND
2012-07-183761-004-0752ND
2012-09-113761-002-1100ND
2013-03-053761-002-1040ND
2013-09-173761-002-0000ND
2014-03-113761-002-1030ND
2014-08-263761-004-1000ND
2014-09-163761-002-1100ND
2015-03-103761-002-0930ND
2015-07-143761-004-0832ND
2015-09-223761-002-0905ND
2016-03-153761-002-0900ND
2016-07-193761-004-0945ND
2016-09-133761-002-1000ND
2017-03-213761-002-0730ND
2017-05-163761-004-0900ND
2017-07-183761-004-0900ND
2017-09-123761-002-0900ND