Chromium (total)
Lafourche Water District 1
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
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 |
|---|---|---|
| 2018-01-25 | 35370415009 | ND |
| 2018-01-25 | 35370415009 | ND |
| 2018-02-26 | 35377894001 | ND |
| 2018-02-26 | 35377894001 | ND |
| 2019-01-29 | 35445082001 | ND |
| 2019-01-29 | 35445082001 | ND |
| 2019-02-18 | 35449374001 | ND |
| 2019-02-18 | 35449374001 | ND |
| 2020-01-22 | B2000278-001 | ND |
| 2020-01-22 | B2000278-002 | ND |
| 2021-03-11 | B2101113-001 | ND |
| 2021-03-11 | B2101113-002 | ND |
| 2022-03-02 | B2200940-001 | ND |
| 2022-03-02 | B2200940-002 | ND |
| 2023-02-27 | B2300792-001 | ND |
| 2023-03-27 | B2301361-001 | ND |