Chromium (total)
City of The Dalles
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 | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 | V8H037502 | ND |
| 2018-08-16 | V8H037501 | ND |
| 2018-08-16 | V8H037503 | ND |
| 2019-08-14 | B9H225804-I | ND |
| 2019-08-14 | B9H225805-I | ND |
| 2019-08-14 | B9H225806-I | ND |
| 2020-08-11 | VDH027404-I | ND |
| 2020-08-11 | VDH027401-I | ND |
| 2020-08-11 | VDH027403-I | ND |
| 2020-08-11 | VDH027402-I | ND |
| 2021-08-18 | 202108190356-I | ND |
| 2021-08-18 | 202108190366-I | ND |
| 2021-08-18 | 202108190355-I | ND |
| 2021-08-18 | 202108190365-I | ND |
| 2022-08-09 | 380-15716-2-I | ND |
| 2022-08-09 | 380-15716-3-I | ND |
| 2022-08-09 | 380-15716-4-I | ND |
| 2022-08-09 | 380-15716-1-I | ND |
| 2023-08-02 | VGH0105-03-I | ND |
| 2023-08-02 | VGH0105-01-I | ND |
| 2023-08-02 | VGH0105-02-I | ND |
| 2023-08-02 | VGH0105-04-I | ND |