Know Your Environment. Protect Your Health.

Cyanide

Nash Forreston Water Supply Corporation

NOTE: Nash Forreston Water Supply Corporation purchases water from City of Waxahachie which is required to test for cyanide. Sample information shown below was taken by City of Waxahachie.

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201889.2 ppb2281.7 ppb - 96.6 ppb
201942.1 ppb21ND - 84.1 ppb
2020ND20ND
2021ND20ND
2022N/A00N/A
2023ND20ND

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

NOTE: Nash Forreston Water Supply Corporation purchases water from City of Waxahachie which is required to test for cyanide. Sample information shown below was taken by City of Waxahachie.

Date Lab ID Result
2018-01-25Q180298200696.6 ppb
2018-01-25Q180298201781.7 ppb
2019-04-29Q1916965016ND
2019-04-29Q191696502084.1 ppb
2020-08-17Q203273801155.6 ppb
2020-08-17Q203273801285.5 ppb
2021-09-16Q2125453015ND
2021-09-16Q2125453016ND
2023-09-05Q2338122005ND
2023-11-20Q2349758010ND