Chromium (total)
Bethany Special Utility District
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 | 2.80 ppb | 5 | 5 | 1.70 ppb - 6.30 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 8.53 ppb | 4 | 4 | 6.50 ppb - 10.00 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 |
|---|---|---|
| 2019-02-07 | Q1905767002 | 1.90 ppb |
| 2019-02-07 | Q1905767003 | 1.90 ppb |
| 2019-02-07 | Q1905767008 | 1.70 ppb |
| 2019-02-07 | Q1905767009 | 2.20 ppb |
| 2019-12-10 | Q1979572004 | 6.30 ppb |
| 2022-10-19 | Q2231823011 | 8.90 ppb |
| 2022-10-19 | Q2231823012 | 8.70 ppb |
| 2022-10-19 | Q2231823013 | 10.00 ppb |
| 2022-10-19 | Q2231823014 | 6.50 ppb |