Know Your Environment. Protect Your Health.

Chromium (total)

Norwich Public Utilities

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.

 

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

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
2018-08-20PH-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