Chromium (total)
Stringer Water Works
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 | ND | 2 | 0 | ND |
| 2020 | 2.70 ppb | 4 | 4 | 1.70 ppb - 3.70 ppb |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 1.35 ppb | 2 | 2 | 1.20 ppb - 1.50 ppb |
| 2023 | 0.900 ppb | 2 | 2 | 0.600 ppb - 1.20 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 |
|---|---|---|
| 2019-03-27 | 190328-025IN | ND |
| 2019-03-27 | 190328-026IN | ND |
| 2020-03-24 | 200325-031IN | 3.50 ppb |
| 2020-03-24 | 200325-032IN | 3.70 ppb |
| 2020-04-21 | 200422-023IN | 1.70 ppb |
| 2020-04-21 | 200422-024IN | 1.90 ppb |
| 2022-05-17 | IN-220518-016 | 1.50 ppb |
| 2022-05-17 | IN-220518-017 | 1.20 ppb |
| 2023-05-16 | IN-230517-013 | 1.20 ppb |
| 2023-05-16 | IN-230517-014 | 0.600 ppb |