Chromium (total)
Gswc - Calipatria
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 | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | 70.0 ppb | 2 | 1 | ND - 140.0 ppb |
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 |
|---|---|---|
| 2018-04-26 | CA1310003_001_001-201804261127 | ND |
| 2019-07-25 | CA1310003_001_001-201907250950 | ND |
| 2020-10-23 | CA1310003_001_001-202010231115 | ND |
| 2021-02-26 | CA1310003_001_001-202102260938 | ND |
| 2022-04-27 | CA1310003_001_001-202204271340 | ND |
| 2023-07-27 | CA1310003_001_001-202307271225 | 140.0 ppb |
| 2023-10-25 | CA1310003_001_001-202310251120 | ND |