Chromium (total)
Brandon-irene Water Supply Corporation
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 | 1.50 ppb | 1 | 1 | 1.50 ppb |
| 2019 | 2.20 ppb | 2 | 2 | 1.20 ppb - 3.20 ppb |
| 2020 | 1.10 ppb | 1 | 1 | 1.10 ppb |
| 2021 | ND | 1 | 0 | ND |
| 2022 | 10.7 ppb | 2 | 2 | 8.40 ppb - 13.0 ppb |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2018-06-12 | Q1823232010 | 1.50 ppb |
| 2019-01-14 | Q1901731010 | 3.20 ppb |
| 2019-04-04 | Q1913766010 | 1.20 ppb |
| 2021-10-11 | Q2128067008 | ND |
| 2022-10-18 | Q2231550008 | 13.0 ppb |
| 2022-10-18 | Q2231550009 | 8.40 ppb |