Chromium (total)
New Orleans Carrollton Waterworks
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 | 6 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2018-03-15 | 35380391001 | ND |
| 2018-03-15 | 35380391002 | ND |
| 2018-03-15 | 35380391001 | ND |
| 2018-03-15 | 35380391002 | ND |
| 2019-02-27 | 35451097001 | ND |
| 2019-02-27 | 35451098001 | ND |
| 2019-02-27 | 35451097001 | ND |
| 2019-02-27 | 35451098001 | ND |
| 2019-09-19 | 35499418001 | ND |
| 2019-09-19 | 35499418001 | ND |
| 2020-03-26 | B2001557-002 | ND |
| 2020-03-26 | B2001575-001 | ND |
| 2020-03-26 | B2001557-001 | ND |
| 2021-03-29 | B2101451-001 | ND |
| 2021-03-29 | B2101452-001 | ND |
| 2021-03-29 | B2101452-002 | ND |
| 2022-03-15 | B2201124-001 | ND |
| 2022-03-15 | B2201124-002 | ND |
| 2022-03-15 | B2201124-003 | ND |
| 2023-03-06 | B2300987-001 | ND |
| 2023-03-06 | B2300987-002 | ND |
| 2023-03-06 | B2300987-003 | ND |