Chromium (hexavalent)
North Reading Water Department
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).
20
Samples
0
Samples exceeding legal limit (MCL)
20
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.0798 ppb | 10 | 10 | 0.0540 ppb - 0.1000 ppb |
| 2015 | 0.0746 ppb | 10 | 10 | 0.0620 ppb - 0.1000 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 | Result |
|---|---|
| 2014-09-17 | 0.0880 ppb |
| 2014-09-17 | 0.0980 ppb |
| 2014-09-17 | 0.1000 ppb |
| 2014-09-17 | 0.0910 ppb |
| 2014-09-23 | 0.0920 ppb |
| 2014-09-23 | 0.0950 ppb |
| 2014-10-08 | 0.0570 ppb |
| 2014-10-08 | 0.0660 ppb |
| 2014-12-10 | 0.0540 ppb |
| 2014-12-10 | 0.0570 ppb |
| 2015-03-17 | 0.0760 ppb |
| 2015-03-17 | 0.0670 ppb |
| 2015-03-17 | 0.0620 ppb |
| 2015-03-17 | 0.0920 ppb |
| 2015-03-18 | 0.0620 ppb |
| 2015-03-18 | 0.0720 ppb |
| 2015-03-18 | 0.0710 ppb |
| 2015-03-18 | 0.1000 ppb |
| 2015-06-17 | 0.0640 ppb |
| 2015-06-17 | 0.0800 ppb |