Know Your Environment. Protect Your Health.

Chromium (total)

CTWC - Naugatuck Region-Central 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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND20ND
2020ND20ND
2021ND20ND
2022ND20ND
20231.000 ppb21ND - 2.00 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
2018-04-10CA17352IOC1ND
2018-06-11CA67844IOC1ND
2018-11-14IOCR 200512736ND
2019-01-16IOC1 200518936ND
2019-01-18IOCR 200519147ND
2020-01-13IOC1 200562694ND
2020-01-13IOCR 200562691ND
2021-04-06IOC1 200611960ND
2021-04-06IOCR 200611959ND
2022-02-14CK66672ND
2022-02-14CK66670ND
2023-01-16CN24828ND
2023-01-16CN248262.00 ppb