Chromium (total)
Heritage Ranch Community Services District
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-05-10 | CA4010012_001_001-201805101300 | ND |
| 2018-05-10 | CA4010012_002_002-201805101306 | ND |
| 2018-11-01 | CA4010012_002_002-201811011318 | ND |
| 2018-11-01 | CA4010012_001_001-201811011307 | ND |
| 2019-05-09 | CA4010012_001_001-201905091217 | ND |
| 2019-05-09 | CA4010012_002_002-201905091240 | ND |
| 2019-11-04 | CA4010012_002_002-201911041315 | ND |
| 2019-11-04 | CA4010012_001_001-201911041310 | ND |
| 2020-05-07 | CA4010012_001_001-202005071035 | ND |
| 2020-05-07 | CA4010012_002_002-202005071053 | ND |
| 2020-11-19 | CA4010012_001_001-202011191330 | ND |
| 2021-06-10 | CA4010012_001_001-202106101322 | ND |
| 2021-11-18 | CA4010012_002_002-202111181030 | ND |
| 2021-11-18 | CA4010012_001_001-202111181020 | ND |
| 2022-05-12 | CA4010012_001_001-202205120944 | ND |
| 2022-05-12 | CA4010012_002_002-202205120953 | ND |
| 2022-11-03 | CA4010012_001_001-202211031053 | ND |
| 2022-11-03 | CA4010012_002_002-202211031059 | ND |
| 2023-05-18 | CA4010012_002_002-202305180948 | ND |
| 2023-05-18 | CA4010012_001_001-202305180931 | ND |
| 2023-11-09 | CA4010012_001_001-202311091019 | ND |
| 2023-11-09 | CA4010012_002_002-202311091028 | ND |