Chromium (total)
City Of Glen Rose
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 | 4 | 0 | ND |
| 2020 | 2.40 ppb | 1 | 1 | 2.40 ppb |
| 2021 | 2.50 ppb | 1 | 1 | 2.50 ppb |
| 2022 | 0.875 ppb | 4 | 1 | ND - 3.50 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 |
|---|---|---|
| 2019-05-01 | Q1917515005 | ND |
| 2019-05-01 | Q1917515006 | ND |
| 2019-05-01 | Q1917515018 | ND |
| 2019-05-01 | Q1917515019 | ND |
| 2022-02-22 | Q2206242003 | 3.50 ppb |
| 2022-11-03 | Q2233476001 | ND |
| 2022-11-03 | Q2233476004 | ND |
| 2022-11-03 | Q2233476005 | ND |
| 2023-01-11 | Q2301770005 | ND |