Know Your Environment. Protect Your Health.

Cyanide

Utrwd Regional Water Treatment Plant

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.

 

12

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
201923.7 ppb21ND - 47.4 ppb
202060.8 ppb2256.2 ppb - 65.3 ppb
202168.0 ppb2226.0 ppb - 110.0 ppb
202219.2 ppb21ND - 38.3 ppb
2023111.4 ppb2268.7 ppb - 154.0 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 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
2018-02-13Q180595700452.2 ppb
2018-09-25Q1838256003ND
2019-03-07Q190991000147.4 ppb
2019-10-02Q1971112004ND
2020-03-09Q200844800456.2 ppb
2020-08-18Q203285900965.3 ppb
2021-02-23Q2104596004110.0 ppb
2021-09-27Q212630500926.0 ppb
2022-01-25Q220243600738.3 ppb
2022-10-31Q2232692001ND
2023-03-07Q2308901004154.0 ppb
2023-08-02Q233144500968.7 ppb