Chromium (total)
Bonney Lake Water Department
NOTE: Bonney Lake Water Department purchases water from City of Tacoma which is required to test for chromium (total). Sample information shown below was taken by City of Tacoma.
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 | 4 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 8 | 0 | ND |
| 2023 | ND | 3 | 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: Bonney Lake Water Department purchases water from City of Tacoma which is required to test for chromium (total). Sample information shown below was taken by City of Tacoma.
| Date | Lab ID | Result |
|---|---|---|
| 2019-12-05 | ND | |
| 2021-06-21 | 4136300 | ND |
| 2021-06-21 | 4136298 | ND |
| 2021-06-21 | 4136296 | ND |
| 2021-06-21 | 4136297 | ND |
| 2021-06-30 | 4143413 | ND |
| 2021-07-21 | 4159325 | ND |
| 2022-09-15 | 4371197 | ND |
| 2022-10-11 | 4371889 | ND |
| 2022-11-15 | 4384533 | ND |
| 2022-12-27 | 4400688 | ND |
| 2022-12-27 | 4400688 | ND |
| 2022-12-27 | 4400688 | ND |
| 2022-12-27 | 4400688 | ND |
| 2022-12-27 | 4400688 | ND |
| 2023-07-12 | 4499689 | ND |
| 2023-07-12 | 4499687 | ND |
| 2023-10-20 | 4549137 | ND |