Chromium (hexavalent)
Swta - Main 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).
44
Samples
0
Samples exceeding legal limit (MCL)
41
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.269 ppb | 18 | 17 | ND - 0.600 ppb |
| 2014 | 0.317 ppb | 26 | 24 | ND - 0.800 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 |
|---|---|---|
| 2013-12-10 | 1062890016 | 0.280 ppb |
| 2013-12-10 | 1062890025 | 0.560 ppb |
| 2013-12-10 | 1062890001 | 0.330 ppb |
| 2013-12-10 | 1062890004 | ND |
| 2013-12-10 | 1062890022 | 0.370 ppb |
| 2013-12-10 | 1062890010 | 0.150 ppb |
| 2013-12-10 | 1062890019 | 0.160 ppb |
| 2013-12-10 | 1062890013 | 0.600 ppb |
| 2013-12-10 | 1062890007 | 0.380 ppb |
| 2013-12-17 | 1063809009 | 0.250 ppb |
| 2013-12-17 | 1063809015 | 0.280 ppb |
| 2013-12-17 | 1063809011 | 0.140 ppb |
| 2013-12-17 | 1063809013 | 0.180 ppb |
| 2013-12-17 | 1063809003 | 0.310 ppb |
| 2013-12-17 | 1063809007 | 0.240 ppb |
| 2013-12-17 | 1063809005 | 0.160 ppb |
| 2013-12-17 | 1063809001 | 0.300 ppb |
| 2013-12-17 | 1063809017 | 0.160 ppb |
| 2014-03-14 | 1076354001 | 0.230 ppb |
| 2014-03-14 | 1076356001 | 0.220 ppb |
| 2014-03-14 | 1076354003 | 0.450 ppb |
| 2014-03-14 | 1076356003 | 0.440 ppb |
| 2014-06-13 | 2012492031 | 0.170 ppb |
| 2014-06-13 | 2012492018 | 0.290 ppb |
| 2014-06-13 | 2012492043 | 0.600 ppb |
| 2014-06-13 | 2012492008 | 0.170 ppb |
| 2014-06-13 | 2012492033 | ND |
| 2014-06-13 | 2012492003 | 0.430 ppb |
| 2014-06-13 | 2012492013 | 0.150 ppb |
| 2014-06-13 | 2012492038 | 0.570 ppb |
| 2014-06-13 | 2012492021 | 0.160 ppb |
| 2014-06-13 | 2012492011 | 0.310 ppb |
| 2014-06-13 | 2012492016 | 0.310 ppb |
| 2014-06-13 | 2012492036 | 0.250 ppb |
| 2014-06-13 | 2012492041 | 0.260 ppb |
| 2014-06-13 | 2012492023 | 0.320 ppb |
| 2014-06-13 | 2012492006 | 0.230 ppb |
| 2014-06-13 | 2012492028 | ND |
| 2014-06-13 | 2012492001 | 0.340 ppb |
| 2014-06-13 | 2012492026 | 0.200 ppb |
| 2014-10-03 | 2032672005 | 0.290 ppb |
| 2014-10-03 | 2032672001 | 0.280 ppb |
| 2014-10-03 | 2032672007 | 0.800 ppb |
| 2014-10-03 | 2032672003 | 0.780 ppb |