Chromium (total)
Triple R Mutual Water Company
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 | ND | 10 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 3.33 ppb | 6 | 1 | ND - 20.0 ppb |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2019-12-11 | CA5400670_008_008-201912111255 | ND |
| 2019-12-11 | CA5400670_010_010-201912111225 | ND |
| 2019-12-11 | CA5400670_011_011-201912111210 | ND |
| 2019-12-11 | CA5400670_005_005-201912111140 | ND |
| 2019-12-11 | CA5400670_007_007-201912111210 | ND |
| 2019-12-11 | CA5400670_004_004-201912110955 | ND |
| 2019-12-11 | CA5400670_002_002-201912111155 | ND |
| 2019-12-11 | CA5400670_001_001-201912111035 | ND |
| 2019-12-11 | CA5400670_006_006-201912111100 | ND |
| 2019-12-11 | CA5400670_009_009-201912111115 | ND |
| 2022-12-28 | CA5400670_007_007-202212281115 | ND |
| 2022-12-28 | CA5400670_009_009-202212281210 | ND |
| 2022-12-28 | CA5400670_008_008-202212281100 | ND |
| 2022-12-28 | CA5400670_006_006-202212281030 | ND |
| 2022-12-28 | CA5400670_001_001-202212281000 | 20.0 ppb |
| 2022-12-28 | CA5400670_011_011-202212281150 | ND |
| 2023-06-30 | CA5400670_005_005-202306301130 | ND |