Chromium (total)
Hughson, City Of
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 | 1.06 ppb | 3 | 2 | ND - 1.68 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 2.02 ppb | 3 | 2 | ND - 3.53 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2018-08-15 | CA5010008_005_005-201808151150 | ND |
| 2018-08-15 | CA5010008_003_003-201808151046 | 1.49 ppb |
| 2018-08-15 | CA5010008_014_014-201808150910 | 1.68 ppb |
| 2021-07-20 | CA5010008_014_014-202107201345 | 2.53 ppb |
| 2021-07-20 | CA5010008_005_005-202107200920 | ND |
| 2021-07-20 | CA5010008_003_003-202107200910 | 3.53 ppb |
| 2023-05-18 | CA5010008_016_016-202305181354 | ND |
| 2023-05-18 | CA5010008_017_017-202305181335 | ND |