Chromium (hexavalent)
City of Nacogdoches
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 | 0.0645 ppb | 10 | 8 | ND - 0.0957 ppb |
2015 | 0.0678 ppb | 2 | 2 | 0.0650 ppb - 0.0706 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 |
---|---|---|
2014-06-09 | 4F11008-01 | 0.0881 ppb |
2014-06-09 | 4F11008-04 | 0.0957 ppb |
2014-06-09 | 4F11008-02 | ND |
2014-06-09 | 4F11008-03 | 0.0902 ppb |
2014-09-16 | 4I19017-01 | 0.0723 ppb |
2014-09-16 | 4I19017-02 | 0.0643 ppb |
2014-12-03 | 4L05010-04 | 0.0763 ppb |
2014-12-03 | 4L05010-02 | ND |
2014-12-03 | 4L05010-03 | 0.0740 ppb |
2014-12-03 | 4L05010-01 | 0.0836 ppb |
2015-03-11 | 5C18005-01 | 0.0706 ppb |
2015-03-11 | 5C18005-02 | 0.0650 ppb |