Chromium (total)
Valley Utilities Water Company Glendale
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 | 10.5 ppb | 4 | 4 | 8.90 ppb - 12.0 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 9.75 ppb | 2 | 2 | 9.50 ppb - 10.00 ppb |
| 2022 | 7.80 ppb | 1 | 1 | 7.80 ppb |
| 2023 | 10.00 ppb | 1 | 1 | 10.00 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 |
|---|---|---|
| 2018-03-01 | 201803010276I | 12.0 ppb |
| 2018-03-01 | 201803010277I | 11.0 ppb |
| 2018-03-07 | 201803070704I | 9.90 ppb |
| 2018-03-07 | 201803070705I | 8.90 ppb |
| 2021-03-03 | 202103040011I | 9.50 ppb |
| 2021-03-03 | 202103040012I | 10.00 ppb |
| 2022-02-02 | 202202030108I | 7.80 ppb |
| 2023-02-02 | 380-36417-3 | 10.00 ppb |