Chromium (hexavalent)
Wilmington 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)
15
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.440 ppb | 20 | 15 | ND - 0.900 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 | Result |
|---|---|
| 2014-01-21 | ND |
| 2014-01-21 | 0.710 ppb |
| 2014-01-21 | 0.480 ppb |
| 2014-01-21 | 0.790 ppb |
| 2014-01-21 | 0.450 ppb |
| 2014-01-21 | 0.0570 ppb |
| 2014-04-29 | ND |
| 2014-04-29 | 0.900 ppb |
| 2014-04-29 | 0.580 ppb |
| 2014-04-29 | 0.560 ppb |
| 2014-07-23 | 0.570 ppb |
| 2014-07-23 | ND |
| 2014-07-23 | ND |
| 2014-07-23 | 0.860 ppb |
| 2014-07-28 | 0.510 ppb |
| 2014-07-28 | 0.830 ppb |
| 2014-10-22 | 0.250 ppb |
| 2014-10-22 | 0.630 ppb |
| 2014-10-22 | 0.620 ppb |
| 2014-10-22 | ND |