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EWG's Tap Water Database — 2021 UPDATE

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Cyanide

Cal-water Service Company - Marysville

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
2013N/A00N/A
2014ND30ND
2015ND40ND
2016ND30ND
2017ND10ND
2018ND40ND
2019ND20ND

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
2014-05-195810-011-1320ND
2014-10-145810-013-1318ND
2014-11-175810-008-1318ND
2015-01-125810-009-1329ND
2015-01-125810-012-1414ND
2015-04-065810-010-1310ND
2015-08-195810-015-1053ND
2016-02-165810-016-1429ND
2016-03-075810-011-1306ND
2016-12-205810-008-1305ND
2017-03-225810-013-1401ND
2018-01-175810-009-1400ND
2018-04-175810-010-1316ND
2018-05-155810-012-1433ND
2018-08-075810-015-1355ND
2019-02-135810-016-1035ND
2019-03-195810-011-1316ND