Chromium (hexavalent)
Golden State Water Company (GSWC) - San Dimas
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).
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 0.340 ppb | 5 | 1 | ND - 1.70 ppb |
| 2015 | ND | 39 | 36 | ND - 2.10 ppb |
| 2016 | 1.18 ppb | 5 | 3 | ND - 2.30 ppb |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
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 |
|---|---|---|
| 2014-11-04 | 9588-051-0910 | ND |
| 2014-11-04 | 9588-017-1005 | ND |
| 2014-11-04 | 9588-014-0920 | ND |
| 2014-11-04 | 9588-013-0900 | ND |
| 2014-11-04 | 9588-004-0850 | 1.70 ppb |
| 2015-01-21 | 5A21031-21A | 0.330 ppb |
| 2015-01-21 | 5A21031-09A | 0.380 ppb |
| 2015-01-21 | 5A21031-11A | 0.590 ppb |
| 2015-01-21 | 5A21031-15A | 0.370 ppb |
| 2015-01-21 | 5A21031-19A | 0.300 ppb |
| 2015-01-21 | 5A21031-03A | 0.460 ppb |
| 2015-01-21 | 5A21031-13A | 0.330 ppb |
| 2015-01-21 | 5A21031-01A | 0.110 ppb |
| 2015-01-21 | 5A21031-17A | 0.360 ppb |
| 2015-01-21 | 5A21031-07A | 0.0340 ppb |
| 2015-01-21 | 5A21031-05A | 0.510 ppb |
| 2015-04-17 | 5D17033-03A | 0.760 ppb |
| 2015-04-17 | 5D17033-01A | 0.0500 ppb |
| 2015-04-17 | 5D17033-05A | 0.0700 ppb |
| 2015-04-17 | 5D17033-07A | 0.710 ppb |
| 2015-04-17 | 5D17033-09A | 0.210 ppb |
| 2015-04-17 | 5D17033-11A | 0.240 ppb |
| 2015-04-17 | 5D17033-13A | 0.470 ppb |
| 2015-06-01 | ND* | |
| 2015-07-01 | 2706-005-1310 | 2.10 ppb |
| 2015-07-21 | 5G21057-11A | 0.650 ppb |
| 2015-07-21 | 5G21057-15A | 0.200 ppb |
| 2015-07-21 | 5G21057-17A | 0.400 ppb |
| 2015-07-21 | 5G21057-13A | 0.240 ppb |
| 2015-07-21 | 5G21057-19A | 0.220 ppb |
| 2015-07-21 | 5G21057-09A | 0.500 ppb |
| 2015-07-21 | 5G21057-21A | 0.180 ppb |
| 2015-07-21 | 5G21057-05A | 0.520 ppb |
| 2015-07-21 | 5G21057-01A | 0.0340 ppb |
| 2015-07-21 | 5G21057-03A | 0.450 ppb |
| 2015-07-21 | 5G21057-07A | 0.0350 ppb |
| 2015-09-11 | 9588-014-0905 | ND |
| 2015-10-20 | 5J21034-07A | 0.1000 ppb |
| 2015-10-20 | 5J21034-09A | 0.250 ppb |
| 2015-10-20 | 5J21034-01A | ND |
| 2015-10-20 | 5J21034-11A | 0.0340 ppb |
| 2015-10-20 | 5J21034-13A | 0.0710 ppb |
| 2015-10-20 | 5J21034-05A | 0.140 ppb |
| 2015-10-20 | 5J21034-03A | 0.280 ppb |
| 2016-03-03 | 9588-017-0815 | ND |
| 2016-05-12 | 9588-003-0910 | 1.80 ppb |
| 2016-05-12 | 9588-004-1100 | 1.80 ppb |
| 2016-05-19 | 9588-005-1055 | 2.30 ppb |
| 2016-09-14 | 9588-013-0900 | ND |
| 2017-01-05 | 9588-051-0800 | ND |
| 2018-08-20 | 9588-014-0925 | ND |
| 2019-02-11 | 9588-017-1015 | ND |
| 2019-05-22 | 9588-003-0800 | ND |
| 2019-08-14 | 9588-013-0825 | ND |
| 2019-09-25 | 9588-004-1010 | ND |
| 2019-12-30 | 9588-051-0940 | ND |
* Sample result is taken from the system's CCR report.