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EWG's Tap Water Database — 2021 UPDATE

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Cyanide

Calleguas 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.

 

47

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND70ND
2015ND80ND
2016ND80ND
2017ND80ND
2018ND80ND
2019ND80ND

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
2014-01-105867-010-1130ND
2014-01-105867-006-0945ND
2014-03-215867-007-1125ND
2014-04-115867-009-1010ND
2014-04-185867-011-1030ND
2014-05-075867-004-0915ND
2014-11-185867-008-1315ND
2015-02-025867-004-0815ND
2015-02-195867-017-1415ND
2015-10-215867-014-1020ND
2015-10-275867-016-1130ND
2015-10-275867-015-1300ND
2015-10-275867-012-1030ND
2015-11-045867-004-1340ND
2015-11-055867-013-1140ND
2016-04-045867-004-0840ND
2016-04-055867-023-1000ND
2016-04-055867-022-0930ND
2016-04-065867-019-1030ND
2016-04-065867-021-1150ND
2016-04-065867-020-1305ND
2016-04-065867-018-1100ND
2016-11-075867-004-0745ND
2017-03-215867-004-1040ND
2017-04-175867-009-1245ND
2017-04-175867-008-1005ND
2017-04-185867-006-1130ND
2017-04-195867-011-1050ND
2017-10-165867-004-0855ND
2017-11-065867-007-1015ND
2017-11-065867-010-1120ND
2018-02-135867-015-1050ND
2018-02-135867-016-0945ND
2018-02-265867-004-0915ND
2018-03-075867-013-1320ND
2018-03-085867-012-1000ND
2018-03-085867-014-1330ND
2018-04-305867-017-1030ND
2018-11-055867-004-0820ND
2019-01-295867-004-0930ND
2019-02-045867-018-0945ND
2019-02-055867-022-1020ND
2019-02-055867-023-0945ND
2019-02-075867-020-0840ND
2019-02-115867-021-0930ND
2019-02-195867-019-1100ND
2019-11-045867-004-0800ND