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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

City of Kerrville

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.

 

28

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
201416.7 ppb91ND - 150.0 ppb
20150.270 ppb41ND - 1.08 ppb
2016ND40ND
2017ND110ND

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
2014-02-10AC41853150.0 ppb
2014-04-07AC49411ND
2014-04-07AC49410ND
2014-05-28AC55303ND
2014-07-16AC59803ND
2014-07-16AC59807ND
2014-10-15AC69712ND
2014-10-15AC69710ND
2014-10-15AC69711ND
2015-01-28AC78069ND
2015-04-15AC88269ND
2015-08-14AD044161.08 ppb
2015-10-13AD10402ND
2016-02-01AD20937ND
2016-04-18AD33308ND
2016-07-05AD42863ND
2016-10-24AD54224ND
2017-02-13AD70272ND
2017-04-06AD78692ND
2017-05-08AD82935ND
2017-05-08AD82937ND
2017-05-08AD82936ND
2017-05-08AD82932ND
2017-05-09AD83234ND
2017-05-09AD83235ND
2017-05-09AD83245ND
2017-07-05AD88261ND
2017-10-09AD99710ND