Chromium (total)
Travis Air Force Base Water Treatment Plant - Vallejo
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 | 5.10 ppb | 2 | 1 | ND - 10.2 ppb |
| 2019 | 3.06 ppb | 5 | 1 | ND - 15.3 ppb |
| 2020 | 6.60 ppb | 5 | 1 | ND - 33.0 ppb |
| 2021 | ND | 5 | 0 | ND |
| 2022 | 0.967 ppb | 3 | 1 | ND - 2.90 ppb |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-09-10 | CA4810015_001_001-201809101227 | ND |
| 2018-10-09 | CA4810015_003_003-201810090750 | 10.2 ppb |
| 2019-01-07 | CA4810015_003_003-201901070825 | ND |
| 2019-04-02 | CA4810015_003_003-201904020745 | ND |
| 2019-07-01 | CA4810015_003_003-201907010805 | 15.3 ppb |
| 2019-09-12 | CA4810015_001_001-201909121115 | ND |
| 2019-10-08 | CA4810015_003_003-201910080900 | ND |
| 2020-01-07 | CA4810015_003_003-202001070855 | ND |
| 2020-04-01 | CA4810015_003_003-202004010820 | ND |
| 2020-07-13 | CA4810015_003_003-202007130945 | ND |
| 2020-09-14 | CA4810015_001_001-202009141102 | ND |
| 2020-10-05 | CA4810015_003_003-202010050835 | 33.0 ppb |
| 2021-01-11 | CA4810015_003_003-202101110850 | ND |
| 2021-04-01 | CA4810015_003_003-202104010821 | ND |
| 2021-07-07 | CA4810015_003_003-202107070820 | ND |
| 2021-09-13 | CA4810015_001_001-202109131133 | ND |
| 2021-10-04 | CA4810015_003_003-202110040805 | ND |
| 2022-01-05 | CA4810015_003_003-202201050906 | 2.90 ppb |
| 2022-07-06 | CA4810015_003_003-202207060830 | ND |
| 2022-09-12 | CA4810015_001_001-202209121111 | ND |
| 2023-01-10 | CA4810015_003_003-202301100815 | ND |
| 2023-09-11 | CA4810015_001_001-202309111259 | ND |