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EWG's Tap Water Database — 2021 UPDATE

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Cyanide

City of Sherman

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.825 ppb101ND - 8.25 ppb
2015ND10ND
201642.4 ppb1142.4 ppb
2017ND100ND
201832.5 ppb1132.5 ppb
2019ND10ND

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
2014-04-22Q1412762016ND
2014-04-22Q1412762015ND
2014-04-22Q1412762014ND
2014-08-20Q14380150268.25 ppb
2014-08-20Q1438015025ND
2014-08-20Q1438015024ND
2014-08-20Q1438015023ND
2014-11-13Q1455961021ND
2014-11-13Q1455961026ND
2014-11-13Q1455961025ND
2015-03-17Q1509888006ND
2016-01-20Q160247900342.4 ppb
2017-01-12Q1701556009ND
2017-01-12Q1701556007ND
2017-07-11Q1728660022ND
2017-07-11Q1728660003ND
2017-10-10Q1751594012ND
2017-10-10Q1751594011ND
2017-10-10Q1751594010ND
2017-10-10Q1751594042ND
2017-10-10Q1751594009ND
2017-11-14Q1758437009ND
2018-07-05Q182660500632.5 ppb
2019-02-12Q1906434020ND