Know Your Environment. Protect Your Health.

Chromium (total)

South Norwalk Electric and Water

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020ND20ND
2021ND20ND
2022ND20ND
2023ND20ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EPA Maximum Contaminant
Level (MCL): 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date Lab ID Result
2018-05-1018051007C-IOC1ND
2018-05-1018051001C-IOCRND
2019-05-0919050907C-IOC1ND
2019-05-0919050901C-IOCRND
2020-05-1420051407C-IOC1ND
2020-05-1420051401C-IOCRND
2021-05-1321051307C-IOC1ND
2021-05-1321051301C-IOCRND
2022-05-1222051207C-IOC1ND
2022-05-1222051201C-IOCRND
2023-05-1723051707C-IOC1ND
2023-05-1723051701C-IOCRND