Chromium (total)
American Falls, City of
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 | 1.25 ppb | 4 | 3 | ND - 2.00 ppb |
| 2020 | 3.00 ppb | 1 | 1 | 3.00 ppb |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 2.00 ppb | 1 | 1 | 2.00 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 |
|---|---|---|
| 2019-05-07 | II90505901 | 2.00 ppb |
| 2019-06-11 | II90614801 | ND |
| 2019-06-12 | II90617201 | 2.00 ppb |
| 2019-10-21 | II91019701 | 1.000 ppb |
| 2020-02-19 | II00210601 | 3.00 ppb |
| 2022-09-14 | II20914701 | 2.00 ppb |