Chromium (total)
South Middleton Twp Water Authority
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 | 2.00 ppb | 3 | 3 | 1.000 ppb - 3.00 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 1.33 ppb | 3 | 3 | 1.000 ppb - 2.00 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-02-15 | 8022500-01 | 1.000 ppb |
| 2018-02-15 | 8022500-02 | 2.00 ppb |
| 2018-02-15 | 8022500-03 | 3.00 ppb |
| 2021-02-17 | 24006882.00 | 1.000 ppb |
| 2021-02-17 | 24006870.00 | 1.000 ppb |
| 2021-02-17 | 24006894.00 | 2.00 ppb |