Chromium (total)
Tesoro Viejo Master Mwc, Inc.
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 | 3 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 11 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 3 | 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 |
|---|---|---|
| 2018-08-15 | CA2010017_002_002-201808151055 | ND |
| 2018-12-06 | CA2010017_006_006-201812061040 | ND |
| 2018-12-12 | CA2010017_001_001-201812121045 | ND |
| 2019-05-15 | CA2010017_001_001-201905151345 | ND |
| 2019-06-12 | CA2010017_006_006-201906121015 | ND |
| 2019-08-21 | CA2010017_002_002-201908210955 | ND |
| 2020-02-05 | CA2010017_006_006-202002051000 | ND |
| 2020-02-19 | CA2010017_006_006-202002190915 | ND |
| 2020-03-03 | CA2010017_006_006-202003031015 | ND |
| 2020-03-03 | CA2010017_003_003-202003031020 | ND |
| 2020-03-04 | CA2010017_006_006-202003041000 | ND |
| 2020-03-04 | CA2010017_003_003-202003041030 | ND |
| 2020-03-05 | CA2010017_006_006-202003051020 | ND |
| 2020-03-05 | CA2010017_003_003-202003051025 | ND |
| 2020-06-03 | CA2010017_002_002-202006031215 | ND |
| 2020-06-09 | CA2010017_001_001-202006090845 | ND |
| 2020-06-15 | CA2010017_002_002-202006151100 | ND |
| 2021-02-03 | CA2010017_006_006-202102031045 | ND |
| 2021-02-17 | CA2010017_006_006-202102171035 | ND |
| 2021-06-09 | CA2010017_001_001-202106090845 | ND |
| 2021-06-28 | CA2010017_002_002-202106280955 | ND |
| 2022-02-16 | CA2010017_006_006-202202160920 | ND |
| 2022-06-08 | CA2010017_001_001-202206080930 | ND |
| 2022-07-06 | CA2010017_002_002-202207060900 | ND |
| 2023-02-13 | CA2010017_002_002-202302130630 | ND |
| 2023-02-14 | CA2010017_006_006-202302141040 | ND |
| 2023-06-05 | CA2010017_001_001-202306051040 | ND |
| 2023-06-20 | CA2010017_001_001-202306200755 | ND |