Chromium (total)
Aqua Pa West Chester
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 | 3.37 ppb | 3 | 3 | 1.10 ppb - 7.20 ppb |
| 2019 | 2.30 ppb | 1 | 1 | 2.30 ppb |
| 2020 | ND | 1 | 0 | ND |
| 2021 | 0.753 ppb | 3 | 2 | ND - 1.30 ppb |
| 2022 | ND | 1 | 0 | ND |
| 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 |
|---|---|---|
| 2018-01-29 | AF74444 | 7.20 ppb |
| 2018-02-22 | AF77012 | 1.80 ppb |
| 2018-03-22 | AF78070 | 1.10 ppb |
| 2019-02-21 | AG09482 | 2.30 ppb |
| 2020-01-16 | 21495554.00 | ND |
| 2021-07-14 | 24820973.00 | ND |
| 2021-08-16 | 25396938.00 | 1.30 ppb |
| 2021-08-18 | 25396928.00 | 0.960 ppb |
| 2022-01-20 | 25934806.00 | ND |
| 2023-03-23 | 28514110.00 | ND |