Chromium (total)
Hca Roan Filter Plant
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 | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-08-16 | AA91020 | ND |
| 2019-07-22 | AA97892 | ND |
| 2020-06-04 | 22436104.00 | ND |
| 2020-10-19 | 23201753.00 | ND |
| 2021-01-07 | 23731022.00 | ND |
| 2021-04-08 | 24266627.00 | ND |
| 2021-07-01 | 24848240.00 | ND |
| 2021-07-21 | 24848433.00 | ND |
| 2022-08-17 | 27255200.00 | ND |
| 2023-02-28 | 28541406.00 | ND |
| 2023-05-02 | 28921456.00 | ND |
| 2023-07-24 | 29320799.00 | ND |
| 2023-08-22 | 29719373.00 | ND |
| 2023-11-14 | 30089942.00 | ND |