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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

City of Gilroy

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
2012ND90ND
2013N/A00N/A
2014N/A00N/A
2015ND90ND
2016N/A00N/A
2017N/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
2012-05-215810-001-0850ND
2012-05-215810-006-1315ND
2012-05-215810-004-1045ND
2012-05-215810-002-1135ND
2012-05-225810-010-1115ND
2012-05-225810-009-1035ND
2012-05-225810-008-0955ND
2012-05-225810-007-0745ND
2012-05-225810-011-0835ND
2015-05-205810-010-0810ND
2015-05-205810-009-1100ND
2015-05-205810-008-1025ND
2015-05-205810-007-1300ND
2015-05-205810-006-0945ND
2015-05-215810-011-0955ND
2015-05-215810-004-1250ND
2015-05-215810-002-1010ND
2015-05-215810-001-0800ND