Know Your Environment. Protect Your Health.

Cyanide (free)

City of Granite Shoals

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201850.0 ppb41ND - 200.0 ppb
2019107.5 ppb43ND - 200.0 ppb
2020142.5 ppb44110.0 ppb - 170.0 ppb
2021117.5 ppb4470.0 ppb - 160.0 ppb
202233.3 ppb31ND - 100.0 ppb
202320.0 ppb41ND - 80.0 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 (free) 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.

ppb = parts per billion

All test results

Date Lab ID Result
2018-02-08AE12924200.0 ppb
2018-05-17AE26693ND
2018-09-17AE40189ND
2018-11-29AE47319ND
2019-03-13AE58195170.0 ppb
2019-05-16AE6674460.0 ppb
2019-09-04AE81941ND
2019-12-11AE92069200.0 ppb
2020-01-27AE95245170.0 ppb
2020-04-14AF06543160.0 ppb
2020-07-06AF18085110.0 ppb
2020-11-03AF32897130.0 ppb
2021-03-11AF46427160.0 ppb
2021-05-20AF54710100.0 ppb
2021-08-24AF6758670.0 ppb
2021-11-04AF75689140.0 ppb
2022-03-07AF87602100.0 ppb
2022-05-24AF98170ND
2022-08-16AG09364ND
2023-03-15AG33071ND
2023-06-07AG4342780.0 ppb
2023-07-31AG50523ND
2023-10-19AG60378ND