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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

City of Grand Prairie

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.

 

14

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
2013N/A00N/A
201421.5 ppb84ND - 107.0 ppb
2015N/A00N/A
2016N/A00N/A
2017ND60ND

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
2014-04-23Q1412991010107.0 ppb
2014-06-04Q1419331010ND
2014-06-26Q1424023038ND
2014-06-26Q142402303028.9 ppb
2014-06-26Q142402302925.9 ppb
2014-06-26Q1424023028ND
2014-09-10Q144299102010.00 ppb
2014-09-10Q1442991019ND
2017-01-05Q1700632023ND
2017-01-05Q1700632007ND
2017-06-27Q1726535041ND
2017-06-27Q1726535011ND
2017-06-27Q1726535040ND
2017-06-27Q1726535010ND