Chromium (hexavalent)
City of Norfolk
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).
16
Samples
0
Samples exceeding legal limit (MCL)
15
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.0398 ppb | 4 | 3 | ND - 0.0890 ppb |
| 2014 | 0.0476 ppb | 12 | 12 | 0.0310 ppb - 0.0780 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 |
|---|---|---|
| 2013-11-12 | 201311130387AM | 0.0350 ppb |
| 2013-11-12 | 201311130370AM | ND |
| 2013-11-12 | 201311130383AM | 0.0350 ppb |
| 2013-11-20 | 201311220209AM | 0.0890 ppb |
| 2014-02-11 | 201402120444AM | 0.0640 ppb |
| 2014-02-11 | 201402120421AM | 0.0360 ppb |
| 2014-02-11 | 201402120434AM | 0.0320 ppb |
| 2014-02-11 | 201402120440AM | 0.0410 ppb |
| 2014-05-13 | 201405140747AM | 0.0390 ppb |
| 2014-05-13 | 201405140534AM | 0.0660 ppb |
| 2014-05-13 | 201405140491AM | 0.0420 ppb |
| 2014-05-13 | 201405140708AM | 0.0780 ppb |
| 2014-08-12 | 201408130844AM | 0.0350 ppb |
| 2014-08-12 | 201408130861AM | 0.0500 ppb |
| 2014-08-12 | 201408130358AM | 0.0570 ppb |
| 2014-08-12 | 201408130644AM | 0.0310 ppb |