Chromium (total)
Collegeville Trappe Joint Public Works Department
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 | 7 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.500 ppb | 10 | 4 | ND - 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 |
|---|---|---|
| 2018-03-05 | 8032060-02 | ND |
| 2018-03-05 | 8032060-03 | ND |
| 2018-03-05 | 8032060-04 | ND |
| 2018-03-05 | 8032060-05 | ND |
| 2018-03-05 | 8032060-06 | ND |
| 2018-03-05 | 8032060-07 | ND |
| 2018-03-05 | 8032060-01 | ND |
| 2021-01-18 | 23711148.00 | ND |
| 2021-01-18 | 23711158.00 | ND |
| 2021-01-18 | 23711168.00 | ND |
| 2021-01-18 | 23711178.00 | ND |
| 2021-01-18 | 23711188.00 | ND |
| 2021-02-03 | 23887250.00 | 1.000 ppb |
| 2021-02-03 | 23887240.00 | 2.00 ppb |
| 2021-02-03 | 23887230.00 | 1.000 ppb |
| 2021-02-03 | 23887220.00 | 1.000 ppb |
| 2021-04-19 | 24246150.00 | ND |