Chromium (total)
City of Lancaster
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 | 2 | 0 | ND |
| 2020 | 1.000 ppb | 2 | 1 | ND - 2.00 ppb |
| 2021 | 0.500 ppb | 2 | 1 | ND - 1.000 ppb |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-04-23 | 2311696001 | ND |
| 2018-04-23 | 2311696002 | ND |
| 2019-01-31 | 3013972001 | ND |
| 2019-01-31 | 3013972003 | ND |
| 2020-04-30 | 22366206.00 | ND |
| 2020-04-30 | 22366218.00 | 2.00 ppb |
| 2021-05-13 | 24591444.00 | ND |
| 2021-05-13 | 24591457.00 | 1.000 ppb |
| 2022-03-22 | 26421129.00 | ND |
| 2022-03-22 | 26421141.00 | ND |
| 2023-03-29 | 28856087.00 | ND |
| 2023-03-29 | 28856088.00 | ND |