Chromium (total)
Smackover Waterworks
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | 0.420 ppb | 5 | 1 | ND - 2.10 ppb |
| 2022 | 7.90 ppb | 3 | 3 | 1.20 ppb - 12.7 ppb |
| 2023 | 4.97 ppb | 3 | 3 | 1.10 ppb - 12.3 ppb |
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 |
|---|---|---|
| 2018-01-30 | Y180320010 | ND |
| 2020-01-27 | Y200300007 | ND |
| 2020-01-27 | Y200300006 | ND |
| 2020-09-15 | Y202610054 | ND |
| 2020-11-16 | Y203240059 | ND |
| 2021-01-26 | Y210280032 | ND |
| 2021-01-26 | Y210280038 | ND |
| 2021-06-07 | Y211610002 | ND |
| 2021-08-23 | Y212380061 | 2.10 ppb |
| 2021-11-08 | Y213160011 | ND |
| 2022-05-24 | Y221460057 | 9.80 ppb |
| 2022-08-16 | Y222300063 | 12.7 ppb |
| 2022-11-07 | Y223130073 | 1.20 ppb |
| 2023-01-31 | Y230330009 | 1.50 ppb |
| 2023-01-31 | Y230330010 | 1.10 ppb |
| 2023-05-31 | Y231520036 | 12.3 ppb |