Know Your Environment. Protect Your Health.

Chromium (total)

City of Opelousas Water 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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND100ND
2019N/A00N/A
2020ND20ND
2021ND40ND
2022N/A00N/A
2023ND60ND

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
2018-01-09AE20408ND
2018-01-09AE20412ND
2018-01-09AE20416ND
2018-01-09AE20420ND
2018-01-09AE20404ND
2018-01-09AE20408ND
2018-01-09AE20412ND
2018-01-09AE20416ND
2018-01-09AE20420ND
2018-01-09AE20404ND
2020-08-17B2004149-002ND
2020-08-17B2004149-001ND
2021-01-19B2100163-001ND
2021-01-19B2100163-002ND
2021-01-19B2100163-003ND
2021-01-19B2100163-004ND
2023-08-28B2303557-001ND
2023-08-28B2303557-002ND
2023-08-28B2303557-003ND
2023-08-28B2303557-004ND
2023-08-28B2303557-005ND
2023-08-28B2303557-006ND