Chromium (total)
Aqua Pa Uwchlan
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 | 4.62 ppb | 6 | 6 | 3.80 ppb - 6.60 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.183 ppb | 6 | 1 | ND - 1.10 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 |
|---|---|---|
| 2018-01-16 | AF73365 | 3.80 ppb |
| 2018-01-16 | AF73366 | 4.50 ppb |
| 2018-01-29 | AF74449 | 6.60 ppb |
| 2018-01-31 | AF73819 | 4.00 ppb |
| 2018-03-14 | AF78055 | 4.00 ppb |
| 2018-03-14 | AF78056 | 4.80 ppb |
| 2021-07-09 | 24819404.00 | ND |
| 2021-08-13 | 25395396.00 | 1.10 ppb |
| 2021-08-13 | 25395416.00 | ND |
| 2021-08-13 | 25395426.00 | ND |
| 2021-08-13 | 25395436.00 | ND |
| 2021-08-16 | 25395406.00 | ND |