Chromium (total)
Sublette, 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 | 1.88 ppb | 5 | 5 | 1.30 ppb - 3.60 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 2.22 ppb | 5 | 5 | 1.20 ppb - 3.80 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 |
|---|---|---|
| 2019-04-16 | 1138822 | 1.80 ppb |
| 2019-04-16 | 1138823 | 1.40 ppb |
| 2019-04-16 | 1138824 | 1.30 ppb |
| 2019-04-16 | 1138825 | 1.30 ppb |
| 2019-06-18 | 1188300 | 3.60 ppb |
| 2022-04-05 | 2231153 | 3.20 ppb |
| 2022-04-05 | 2231155 | 3.80 ppb |
| 2022-04-05 | 2231154 | 1.40 ppb |
| 2022-04-05 | 2231151 | 1.20 ppb |
| 2022-05-10 | 2255277 | 1.50 ppb |