Chromium (total)
Paw Blue Mountain Division
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 | 2 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 5 | 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 |
|---|---|---|
| 2018-08-01 | 40645801 | ND |
| 2018-08-01 | 40644901 | ND |
| 2019-07-16 | 45238801 | ND |
| 2019-08-05 | 45828801 | ND |
| 2020-07-20 | 22668219.00 | ND |
| 2020-07-20 | 22668206.00 | ND |
| 2020-08-17 | 22861766.00 | ND |
| 2020-08-17 | 22861753.00 | ND |
| 2021-08-09 | 25083719.00 | ND |
| 2021-08-09 | 25083705.00 | ND |
| 2021-09-13 | 25278079.00 | ND |
| 2021-09-13 | 25278109.00 | ND |
| 2021-09-13 | 25278095.00 | ND |
| 2022-08-03 | 27300400.00 | ND |
| 2022-08-04 | 27300397.00 | ND |
| 2022-08-22 | 27300643.00 | ND |
| 2022-08-29 | 27300659.00 | ND |
| 2023-07-24 | 29363611.00 | ND |
| 2023-07-24 | 29363597.00 | ND |
| 2023-10-02 | 29944331.00 | ND |
| 2023-10-03 | 29944351.00 | ND |