Chromium (total)
Metropolitan Utilities District
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 | N/A | 0 | 0 | N/A |
| 2019 | 1.49 ppb | 3 | 3 | 0.986 ppb - 1.82 ppb |
| 2020 | 1.53 ppb | 5 | 5 | 1.25 ppb - 1.83 ppb |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 1.24 ppb | 2 | 2 | 1.07 ppb - 1.41 ppb |
| 2023 | 0.870 ppb | 2 | 1 | ND - 1.74 ppb |
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 |
|---|---|---|
| 2019-06-10 | 603528 | 1.66 ppb |
| 2019-06-10 | 603527 | 0.986 ppb |
| 2019-07-15 | 622141 | 1.82 ppb |
| 2020-05-20 | 668835 | 1.26 ppb |
| 2020-05-20 | 668834 | 1.59 ppb |
| 2020-05-20 | 668831 | 1.71 ppb |
| 2020-05-20 | 668832 | 1.25 ppb |
| 2020-05-20 | 668833 | 1.83 ppb |
| 2022-04-11 | 792920 | 1.07 ppb |
| 2022-07-11 | 810012 | 1.41 ppb |
| 2023-01-17 | 844830 | 1.74 ppb |
| 2023-04-05 | 855771 | ND |