Know Your Environment. Protect Your Health.

Chromium (total)

Rapides Parish Waterworks District 3

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND20ND
2020ND50ND
2021ND20ND
2022ND10ND
2023ND40ND

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
2018-03-2235381823001ND
2018-03-2235381823001ND
2019-04-1735463257001ND
2019-04-1735463257001ND
2020-01-21B2000218-001ND
2020-01-21B2000218-002ND
2020-01-21B2000218-003ND
2020-03-11B2001272-001ND
2020-04-22B2001837-001ND
2021-05-05B2102137-001ND
2021-05-05B2102137-002ND
2022-04-18B2201845-001ND
2023-01-18B2300206-001ND
2023-01-18B2300206-002ND
2023-01-18B2300206-003ND
2023-04-03B2301556-001ND