Chromium (total)
Quinlan North Subdivision
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 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | 2.30 ppb | 1 | 1 | 2.30 ppb |
| 2021 | 1.10 ppb | 1 | 1 | 1.10 ppb |
| 2022 | ND | 1 | 0 | ND |
| 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 |
|---|---|---|
| 2018-05-08 | AE28126 | ND |
| 2019-06-05 | Q1932126005 | ND |
| 2020-02-19 | Q2006393004 | 2.30 ppb |
| 2021-02-23 | Q2104582004 | 1.10 ppb |
| 2022-02-25 | Q2206628002 | ND |
| 2023-05-17 | Q2318657004 | ND |