Chromium (total)
Duncan Public Utilities Authority
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 0.172 ppb | 2 | 1 | ND - 0.344 ppb |
2015 | 0.434 ppb | 6 | 6 | 0.214 ppb - 0.772 ppb |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State and national drinking water standards and health guidelines
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 |
---|---|---|
2014-11-05 | 4K05130-01 | ND |
2014-11-05 | 4K05130-04 | 0.344 ppb |
2015-02-04 | 5B04146-01 | 0.214 ppb |
2015-02-04 | 5B04146-04 | 0.330 ppb |
2015-05-06 | 5E06207-04 | 0.520 ppb |
2015-05-06 | 5E06207-01 | 0.449 ppb |
2015-08-05 | 5H05200-01 | 0.318 ppb |
2015-08-05 | 5H05200-04 | 0.772 ppb |