Know Your Environment. Protect Your Health.

Chromium (total)

Connecticut Water Company - Northern Region-Western System

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND50ND
2019ND20ND
20200.333 ppb31ND - 1.000 ppb
2021ND20ND
20220.167 ppb61ND - 1.000 ppb
20230.200 ppb51ND - 1.000 ppb

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
2018-01-23BZ78887IOC1ND
2018-01-31BZ82691IOCRND
2018-03-02BZ97488IOC1ND
2018-07-12CA89150ND
2018-07-13CA89903ND
2019-01-10IOCR 200518412ND
2019-01-15IOC1 200518779ND
2020-01-09IOC1 200562368ND
2020-01-15IOCR 200563111ND
2020-09-21IOC1 2005910231.000 ppb
2021-02-17IOC1 200607102ND
2021-03-05IOCR 200608709ND
2022-01-24CK22294ND
2022-01-25CK231761.000 ppb
2022-02-01CK27430ND
2022-02-01CK27434ND
2022-02-16CK69357ND
2022-09-08CM25672ND
2023-01-11CN20957ND
2023-01-18CN25096ND
2023-08-23CO816721.000 ppb
2023-10-31CP38331ND
2023-12-13CP67269ND