Chromium (total)
Ruston 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.
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 12 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 10 | 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 |
|---|---|---|
| 2020-01-06 | B2000117-001 | ND |
| 2020-01-13 | B2000162-008 | ND |
| 2020-01-13 | B2000162-001 | ND |
| 2020-01-13 | B2000162-002 | ND |
| 2020-01-13 | B2000162-003 | ND |
| 2020-01-13 | B2000162-004 | ND |
| 2020-01-13 | B2000162-005 | ND |
| 2020-01-13 | B2000162-006 | ND |
| 2020-01-13 | B2000162-007 | ND |
| 2020-06-22 | 35558556001 | ND |
| 2020-06-22 | 35558556002 | ND |
| 2020-12-08 | B2006533-001 | ND |
| 2023-02-27 | B2300832-001 | ND |
| 2023-02-27 | B2300832-002 | ND |
| 2023-02-27 | B2300832-003 | ND |
| 2023-02-27 | B2300832-004 | ND |
| 2023-02-27 | B2300832-005 | ND |
| 2023-03-06 | B2300980-001 | ND |
| 2023-03-06 | B2300980-002 | ND |
| 2023-03-06 | B2300980-003 | ND |
| 2023-03-06 | B2300980-004 | ND |
| 2023-03-06 | B2300980-005 | ND |