Know Your Environment. Protect Your Health.

Cyanide

Cross Timbers Water Supply Corporation

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
201826.1 ppb21ND - 52.2 ppb
2019ND10ND
2020ND40ND
202168.0 ppb2226.0 ppb - 110.0 ppb
202222.4 ppb21ND - 44.7 ppb
20238.80 ppb31ND - 26.4 ppb

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
2019-06-05Q1932306011ND
2020-10-12Q2039719023ND
2020-10-12Q2039719024ND
2020-10-12Q2039719025ND
2020-12-01Q2048173008ND
2022-09-22Q2228542003ND
2022-11-29Q223531201144.7 ppb
2023-03-02Q2308488012ND
2023-11-27Q235041101526.4 ppb
2023-11-27Q2350411016ND