Chromium (total)
City of Tualatin
NOTE: City of Tualatin purchases water from Portland Water Bureau which is required to test for chromium (total). Sample information shown below was taken by Portland Water Bureau.
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 | 2 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 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
NOTE: City of Tualatin purchases water from Portland Water Bureau which is required to test for chromium (total). Sample information shown below was taken by Portland Water Bureau.
| Date | Lab ID | Result |
|---|---|---|
| 2018-03-15 | BC03118-I | ND |
| 2018-04-03 | BC04117-I | ND |
| 2019-04-02 | BC21049-I | ND |
| 2019-07-15 | BC25289-I | ND |
| 2020-05-12 | BC38533-I | ND |
| 2020-08-05 | BC41646-I | ND |
| 2021-04-06 | BC53668-I | ND |
| 2021-08-04 | BC60213-I | ND |
| 2022-04-05 | BC75262-I | ND |
| 2022-08-03 | BC85642-I | ND |
| 2023-04-04 | BC96020-I | ND |
| 2023-08-29 | BD02264-I | ND |