Know Your Environment. Protect Your Health.

Cyanide

The Oaks Water Supply Corporation

NOTE: The Oaks Water Supply Corporation purchases water from San Antonio Water System which is required to test for cyanide. Sample information shown below was taken by San Antonio Water 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.

 

82

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND10ND
2020ND30ND
2021ND10ND
2022ND10ND
2023ND30ND

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: The Oaks Water Supply Corporation purchases water from San Antonio Water System which is required to test for cyanide. Sample information shown below was taken by San Antonio Water System.

Date Lab ID Result
2018-03-01AE16243ND
2018-09-27AE41904ND
2018-09-27AE41911ND
2018-12-07AE48337ND
2018-12-07AE48338ND
2019-04-25AE63657ND
2020-02-19AE98930ND
2020-03-26AF04670ND
2020-03-26AF04671ND
2020-03-30AF04856ND
2020-03-30AF04857ND
2020-03-30AF04858ND
2020-03-31AF05005ND
2020-03-31AF05003ND
2020-06-15AF15306ND
2020-07-21AF20382ND
2020-07-21AF20383ND
2020-10-05AF29424ND
2020-10-05AF29423ND
2020-10-05AF29422ND
2020-10-07AF29753ND
2020-10-07AF29752ND
2020-10-29AF32565ND
2020-10-29AF32564ND
2020-10-29AF32562ND
2020-11-11AF33929ND
2020-11-11AF33927ND
2020-11-11AF33926ND
2020-11-11AF33925ND
2020-11-11AF33924ND
2020-11-12AF34323ND
2020-11-16AF34521ND
2020-11-16AF34525ND
2020-11-16AF34523ND
2020-11-17AF34827ND
2020-11-17AF34821ND
2020-11-18AF35054ND
2020-11-18AF35053ND
2020-11-19AF35240ND
2020-12-15AF37621ND
2020-12-15AF37620ND
2020-12-18AF38127ND
2021-01-26AF40972ND
2021-03-03AF45007ND
2021-03-03AF45008ND
2021-05-11AF53141ND
2021-05-11AF53142ND
2021-06-14AF57674ND
2021-09-28AF71379ND
2022-04-13AF93059ND
2023-02-22AG29857ND
2023-05-08AG39487ND
2023-06-27AG46063ND
2023-07-11AG47764ND
2023-07-12AG48060ND
2023-07-12AG48061ND
2023-10-31AG61747ND
2023-10-31AG61748ND
2023-10-31AG61745ND
2023-10-31AG61744ND
2023-10-31AG61746ND
2023-11-01AG62015ND
2023-11-01AG62014ND
2023-11-01AG62013ND
2023-11-01AG62012ND
2023-11-01AG62011ND
2023-11-14AG63487ND
2023-11-15AG63682ND
2023-11-15AG63685ND
2023-11-15AG63684ND
2023-11-15AG63683ND
2023-11-15AG63681ND
2023-11-15AG63680ND
2023-11-15AG63679ND
2023-11-15AG63678ND
2023-11-15AG63672ND
2023-11-15AG63671ND
2023-11-16AG63941ND
2023-12-18AG66767ND
2023-12-18AG66768ND
2023-12-18AG66771ND
2023-12-19AG66961ND