Chromium (total)
City of Chubbuck
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 | 8.60 ppb | 5 | 4 | ND - 13.0 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 11.0 ppb | 2 | 2 | 8.00 ppb - 14.0 ppb |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2019-01-16 | II90110901 | 12.0 ppb |
| 2019-03-28 | II90320401 | 9.00 ppb |
| 2019-04-10 | II90408601 | 9.00 ppb |
| 2019-06-04 | II90604901 | 13.0 ppb |
| 2019-07-10 | II90712501 | ND |
| 2022-07-11 | II20710901 | 8.00 ppb |
| 2022-07-27 | II20740701 | 14.0 ppb |