Chromium (hexavalent)
Layton City Water System
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).
14
Samples
0
Samples exceeding legal limit (MCL)
14
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.435 ppb | 5 | 5 | 0.182 ppb - 0.629 ppb |
| 2014 | 0.396 ppb | 5 | 5 | 0.102 ppb - 0.507 ppb |
| 2015 | 0.429 ppb | 4 | 4 | 0.219 ppb - 0.550 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 |
|---|---|
| 2013-09-10 | 0.310 ppb |
| 2013-09-10 | 0.182 ppb |
| 2013-09-10 | 0.486 ppb |
| 2013-12-13 | 0.568 ppb |
| 2013-12-13 | 0.629 ppb |
| 2014-03-12 | 0.494 ppb |
| 2014-03-12 | 0.507 ppb |
| 2014-03-12 | 0.475 ppb |
| 2014-06-12 | 0.102 ppb |
| 2014-06-12 | 0.401 ppb |
| 2015-03-26 | 0.454 ppb |
| 2015-10-15 | 0.219 ppb |
| 2015-10-15 | 0.550 ppb |
| 2015-12-17 | 0.491 ppb |