Chromium (hexavalent)
City of Hillsboro
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 |
---|---|---|---|---|
2013 | 0.124 ppb | 4 | 4 | 0.115 ppb - 0.143 ppb |
2014 | 0.167 ppb | 4 | 4 | 0.113 ppb - 0.204 ppb |
2015 | N/A | 0 | 0 | N/A |
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 |
---|---|---|
2013-07-15 | WA97-SE1-13-1251 | 0.115 ppb |
2013-07-15 | WA97-SE1-13-1251 | 0.116 ppb |
2013-10-14 | WA97-SE2-13-1968 | 0.143 ppb |
2013-10-14 | WA97-SE2-19683-4 | 0.122 ppb |
2014-01-06 | WA97-SE3-14-0026 | 0.154 ppb |
2014-01-06 | WA97-SE3-14-0026 | 0.113 ppb |
2014-04-16 | WA97-SE4-14-0665 | 0.196 ppb |
2014-04-16 | WA97-SE4-14-0665 | 0.204 ppb |