Know Your Environment. Protect Your Health.

Cyanide

Decatur Waterworks

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.

 

39

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018151.3 ppb8850.0 ppb - 260.0 ppb
2019150.0 ppb97ND - 310.0 ppb
202091.1 ppb94ND - 370.0 ppb
2021ND80ND
202282.5 ppb41ND - 330.0 ppb
2023ND10ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-02-07Y180400009130.0 ppb
2018-05-01Y181240003260.0 ppb
2018-07-31Y182140019160.0 ppb
2018-07-31Y182130105130.0 ppb
2018-07-31Y182130106140.0 ppb
2018-11-14Y183190013180.0 ppb
2018-11-14Y183190012160.0 ppb
2018-11-14Y18319001950.0 ppb
2019-02-12Y190440010170.0 ppb
2019-02-12Y190440001180.0 ppb
2019-02-12Y190440007240.0 ppb
2019-05-15AN1784189ND
2019-05-15AN1784188ND
2019-05-15Y191360038170.0 ppb
2019-05-15Y191360034310.0 ppb
2019-08-13Y192270041150.0 ppb
2019-08-13Y192270040130.0 ppb
2020-03-24Y200860021190.0 ppb
2020-03-24Y200860020370.0 ppb
2020-03-25Y200860022210.0 ppb
2020-05-12EF4627938ND
2020-05-12Y20135000450.0 ppb
2020-09-01AN1918827ND
2020-09-01Y202470001ND
2020-11-03Y203100037ND
2020-11-03AN1937530ND
2021-02-09AN1962841ND
2021-02-09Y210430014ND
2021-05-11Y211320010ND
2021-05-11AN1987278ND
2021-08-17Y212310031ND
2021-08-17AN2015804ND
2021-11-16Y213220051ND
2021-11-16ANA2042429ND
2022-02-09Y220400036330.0 ppb
2022-05-11Y221320037ND
2022-08-30Y222440012ND
2022-11-08Y223130054ND
2023-05-09Y231310015ND