Chromium (total)
Starr Water Supply Corporation
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 | 2.78 ppb | 4 | 3 | ND - 4.10 ppb |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 3.50 ppb | 4 | 1 | ND - 14.0 ppb |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-10-04 | Q1839859009 | 3.50 ppb |
| 2018-10-04 | Q1839859010 | ND |
| 2018-10-04 | Q1839859011 | 3.50 ppb |
| 2018-10-04 | Q1839859012 | 4.10 ppb |
| 2021-05-19 | Q2113143004 | 14.0 ppb |
| 2021-11-17 | Q2132246010 | ND |
| 2021-11-17 | Q2132246011 | ND |
| 2021-11-17 | Q2132246012 | ND |