Chromium (hexavalent)
City of Concord
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 | 0.185 ppb | 9 | 9 | 0.0480 ppb - 0.430 ppb |
2015 | 0.340 ppb | 3 | 3 | 0.210 ppb - 0.410 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 |
---|---|---|
2014-04-14 | 35134253005AM | 0.120 ppb |
2014-04-14 | 35134253003AM | 0.0480 ppb |
2014-04-14 | 35134253001AM | 0.0640 ppb |
2014-07-15 | 35146563005AM | 0.220 ppb |
2014-07-15 | 35146563003AM | 0.190 ppb |
2014-07-15 | 35146563001AM | 0.0510 ppb |
2014-10-14 | 35159414005AM | 0.430 ppb |
2014-10-14 | 35159414003AM | 0.380 ppb |
2014-10-14 | 35159414001AM | 0.160 ppb |
2015-01-21 | 35172516005AM | 0.400 ppb |
2015-01-21 | 35172516003AM | 0.410 ppb |
2015-01-21 | 35172516001AM | 0.210 ppb |