Chromium (total)
Town of Oakland
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 | 2 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 5 | 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 |
|---|---|---|
| 2018-05-10 | E18004082004 | ND |
| 2018-05-10 | E18004082003 | ND |
| 2018-10-15 | 64637 | ND |
| 2018-10-18 | 64636 | ND |
| 2019-08-19 | 67330 | ND |
| 2019-08-19 | 67331 | ND |
| 2020-06-02 | E20003710003 | ND |
| 2020-06-23 | E20003926003 | ND |
| 2020-09-02 | 70323 | ND |
| 2020-09-02 | 70324 | ND |
| 2021-06-08 | E21003620003 | ND |
| 2021-06-08 | E21003620004 | ND |
| 2021-09-14 | 73451 | ND |
| 2021-09-14 | 73452 | ND |
| 2022-06-09 | E2201076701 | ND |
| 2022-06-09 | E2201076704 | ND |
| 2022-07-28 | 76283 | ND |
| 2022-07-28 | 76284 | ND |
| 2022-07-28 | 78597 | ND |
| 2023-04-18 | 78596 | ND |
| 2023-04-18 | 78597-A | ND |