Chromium (hexavalent)
City of Rockport
Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 0.0242 ppb | 6 | 4 | ND - 0.0493 ppb |
2015 | 0.0384 ppb | 2 | 2 | 0.0362 ppb - 0.0405 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
EWG Health Guideline 0.02 ppb
The EWG Health Guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
ppb = parts per billion
All test results
Date | Lab ID | Result |
---|---|---|
2014-05-18 | 4E23018-01 | 0.0333 ppb |
2014-05-18 | 4E23018-02 | 0.0311 ppb |
2014-08-21 | 4H27040-02 | ND |
2014-08-21 | 4H27040-01 | ND |
2014-11-19 | 4K21031-02 | 0.0493 ppb |
2014-11-19 | 4K21031-01 | 0.0315 ppb |
2015-02-26 | 5C04014-02 | 0.0362 ppb |
2015-02-26 | 5C04014-01 | 0.0405 ppb |