Know Your Environment. Protect Your Health.

Chromium (total)

Mitchell County Rural Water District 2

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.10 ppb112.10 ppb
20193.10 ppb113.10 ppb
20202.10 ppb112.10 ppb
20211.10 ppb111.10 ppb
2022ND10ND
2023ND10ND

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
2018-04-179377062.10 ppb
2019-04-2211381543.10 ppb
2020-04-1313565562.10 ppb
2021-04-1218162001.10 ppb
2022-04-192239682ND
2023-04-042477929ND