Chromium (total)
Woodstock Ranch
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 | 17.0 ppb | 1 | 1 | 17.0 ppb |
| 2019 | 25.0 ppb | 2 | 2 | 13.0 ppb - 37.0 ppb |
| 2020 | 10.00 ppb | 1 | 1 | 10.00 ppb |
| 2021 | 16.0 ppb | 1 | 1 | 16.0 ppb |
| 2022 | 22.0 ppb | 2 | 2 | 13.0 ppb - 31.0 ppb |
| 2023 | 35.0 ppb | 1 | 1 | 35.0 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 |
|---|---|---|
| 2018-06-14 | CA4200807_003_003-201806140750 | 17.0 ppb |
| 2019-03-27 | CA4200807_007_007-201903270915 | 37.0 ppb |
| 2019-09-19 | CA4200807_008_008-201909190955 | 13.0 ppb |
| 2020-06-04 | CA4200807_009_009-202006040816 | 10.00 ppb |
| 2021-03-02 | CA4200807_003_003-202103021150 | 16.0 ppb |
| 2022-02-08 | CA4200807_008_008-202202080910 | 13.0 ppb |
| 2022-02-08 | CA4200807_007_007-202202080940 | 31.0 ppb |
| 2023-01-19 | CA4200807_009_009-202301190910 | 35.0 ppb |