Chromium (total)
Purcellville, Town of
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 | 2 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 6 | 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 |
|---|---|---|
| 2018-02-27 | E180100341 | ND |
| 2018-05-23 | E180303856 | ND |
| 2019-03-21 | E190302939 | ND |
| 2019-03-21 | E190302950 | ND |
| 2019-05-29 | E190304845 | ND |
| 2020-02-25 | E191203660 | ND |
| 2020-05-20 | E200302299 | ND |
| 2020-05-20 | E200302297 | ND |
| 2020-06-16 | E200302293 | ND |
| 2021-03-15 | E210100126 | ND |
| 2021-05-17 | E210400644 | ND |
| 2021-10-28 | E211003146 | ND |
| 2022-04-11 | E220303685 | ND |
| 2023-04-27 | E230305391 | ND |
| 2023-04-27 | E230305400 | ND |
| 2023-04-27 | E230305405 | ND |
| 2023-04-27 | E230305417 | ND |
| 2023-05-01 | E230305410 | ND |
| 2023-11-01 | E230904711 | ND |