Know Your Environment. Protect Your Health.

Cyanide

City of Gladewater

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
2018ND40ND
201961.3 ppb42ND - 124.0 ppb
2020ND40ND
2021ND40ND
202227.8 ppb41ND - 111.0 ppb
2023ND40ND

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
2018-01-09Q1800843004ND
2018-04-05Q1814312001ND
2018-07-12Q1827704001ND
2018-10-10Q1840315002ND
2019-02-14Q1906941001124.0 ppb
2019-04-23Q1916380002ND
2019-08-08Q1952472003ND
2019-10-24Q1973685001121.0 ppb
2020-03-03Q2007980002ND
2020-06-15Q2023824003ND
2020-09-28Q2038309005ND
2020-11-16Q2044987003ND
2021-03-18Q2107123004ND
2021-06-14Q2115405001ND
2021-09-01Q2123756001ND
2021-11-05Q2131131001ND
2022-01-25Q2202502008111.0 ppb
2022-04-07Q2210806002ND
2022-07-07Q2219099003ND
2022-10-06Q2230217001ND
2023-01-04Q2300567004ND
2023-04-11Q2313812001ND
2023-07-19Q2328451003ND
2023-10-05Q2342802001ND