Know Your Environment. Protect Your Health.

Cyanide

Norwich Public Utilities

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.

 

21

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND40ND
2019ND50ND
2020ND50ND
2021ND20ND
2022ND30ND
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

Date Lab ID Result
2018-08-20PH-0453-6304414IOC1ND
2018-08-20PH-0453-6304416IOCRND
2018-08-20PH-0453-6304417IOCRND
2018-08-20PH-0453-6304413IOC1ND
2019-08-29PH-0453-6305529IOC1ND
2019-08-29PH-0453-6305531IOC1ND
2019-08-29PH-0453-6305532IOCRND
2019-09-19PH-0453-6305530IOC1ND
2019-11-07PH-0453-6305533IOCRND
2020-06-10PH-0453-6306357IOC1ND
2020-06-10PH-0453-6306433IOCRND
2020-06-10PH-0453-6306432IOCRND
2020-06-10PH-0453-6306358IOC1ND
2020-06-10PH-0453-6306356IOC1ND
2021-05-24PH-0453-6307275IOC1ND
2021-05-24PH-0453-6307278IOCRND
2022-01-13PH-0453-6307955IOC1ND
2022-01-13PH-0453-6307958IOCRND
2022-11-21PH-0453-6307956IOC1ND
2023-11-14D3K1545-01IOCND
2023-11-14D3K1545-02IOCND