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EWG's Tap Water Database — 2019 UPDATE

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Cyanide

Connecticut Water Company - Shoreline Region-chester System

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.

 

15

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
2014ND40ND
2015ND20ND
2016ND30ND
2017ND20ND

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
2012-01-04070IOC1ND
2012-01-04071IOC1ND
2013-01-08245IOC1ND
2013-01-08247IOC1ND
2014-01-29140130CWCCIOC1ND
2014-01-29140130CWCFIOC1ND
2014-08-13BG93531IOC1ND
2014-12-04BH49355IOC1ND
2015-02-12BH73176IOC1ND
2015-02-12BH73175IOCRND
2016-01-27BK58353IOC1ND
2016-01-27BK58356IOCRND
2016-05-25BN40398IOC1ND
2017-01-18BX33132IOC1ND
2017-06-12BY37361IOCRND