Chromium (total)
Hollister Ranch Estates
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 | N/A | 0 | 0 | N/A |
| 2019 | 4.05 ppb | 2 | 2 | 3.70 ppb - 4.40 ppb |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 19.7 ppb | 2 | 2 | 11.9 ppb - 27.4 ppb |
| 2023 | 12.5 ppb | 1 | 1 | 12.5 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 |
|---|---|---|
| 2019-12-09 | CA3500904_002_002-201912091255 | 3.70 ppb |
| 2019-12-09 | CA3500904_001_001-201912091238 | 4.40 ppb |
| 2022-12-12 | CA3500904_002_002-202212121255 | 27.4 ppb |
| 2022-12-12 | CA3500904_001_001-202212121240 | 11.9 ppb |
| 2023-10-10 | CA3500904_006_006-202310100910 | 12.5 ppb |