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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

Cal-am Water Company - Duarte

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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013ND150ND
2014ND80ND
2015ND70ND
2016ND130ND
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
2013-09-181225-009-1025ND
2013-09-181225-004-1045ND
2013-09-181225-007-0950ND
2013-09-181225-008-1105ND
2013-09-181225-003-1010ND
2013-09-181225-010-1150ND
2013-09-181225-002-1130ND
2013-09-181225-019-0850ND
2013-12-049588-010-1220ND
2013-12-049588-009-1105ND
2013-12-049588-003-1055ND
2013-12-049588-008-1140ND
2013-12-049588-007-1040ND
2013-12-049588-004-1130ND
2013-12-049588-002-1210ND
2014-06-231225-002-1300ND
2014-06-231225-003-1110ND
2014-06-231225-007-1240ND
2014-06-231225-008-1235ND
2014-06-231225-009-1135ND
2014-06-231225-010-1330ND
2014-06-231225-019-1005ND
2014-12-039588-019-1020ND
2015-09-281225-003-1050ND
2015-09-281225-007-1200ND
2015-09-281225-008-1330ND
2015-09-281225-010-0945ND
2015-09-281225-009-1345ND
2015-10-141225-002-1205ND
2015-10-141225-019-0945ND
2016-06-201225-008-1145ND
2016-06-201225-010-1135ND
2016-06-201225-019-1115ND
2016-07-201225-009-1030ND
2016-07-201225-007-0930ND
2016-07-201225-003-1000ND
2016-07-201225-002-1110ND
2016-09-079588-009-1400ND
2016-09-079588-008-1345ND
2016-09-079588-007-1245ND
2016-09-079588-010-1315ND
2016-09-079588-003-1305ND
2016-09-079588-002-1330ND