Chromium (hexavalent)
California Water Service (CWS) - Los Altos Suburban
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).
72
Samples
0
Samples exceeding legal limit (MCL)
62
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.952 ppb | 46 | 46 | 0.0650 ppb - 2.60 ppb |
| 2014 | 0.948 ppb | 12 | 8 | ND - 2.60 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | 1.09 ppb | 13 | 8 | ND - 2.60 ppb |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2013-06-04 | 201306060115AM | 1.50 ppb |
| 2013-06-04 | 201306060102AM | 0.300 ppb |
| 2013-06-04 | 201306060238AM | 1.60 ppb |
| 2013-06-05 | 201306060172AM | 1.60 ppb |
| 2013-06-05 | 201306060244AM | 1.30 ppb |
| 2013-06-05 | 201306060217AM | 0.290 ppb |
| 2013-06-10 | 201306110155AM | 0.0840 ppb |
| 2013-06-10 | 201306110109AM | 1.50 ppb |
| 2013-06-10 | 201306110142AM | 0.650 ppb |
| 2013-06-10 | 201306110205AM | 0.780 ppb |
| 2013-06-10 | 201306110393AM | 0.520 ppb |
| 2013-06-10 | 201306110409AM | 1.50 ppb |
| 2013-06-10 | 201306110088AM | 0.520 ppb |
| 2013-06-10 | 201306110199AM | 0.760 ppb |
| 2013-06-12 | 201306130095AM | 2.60 ppb |
| 2013-06-13 | 201306140049AM | 0.790 ppb |
| 2013-06-13 | 201306140054AM | 0.870 ppb |
| 2013-06-13 | 201306140063AM | 0.450 ppb |
| 2013-06-18 | 201306190306AM | 1.90 ppb |
| 2013-06-18 | 201306190285AM | 0.940 ppb |
| 2013-06-18 | 201306190263AM | 1.20 ppb |
| 2013-09-11 | 201309120307AM | 0.190 ppb |
| 2013-09-11 | 201309120300AM | 0.0960 ppb |
| 2013-12-03 | 201312040596AM | 1.60 ppb |
| 2013-12-03 | 201312040579AM | 0.630 ppb |
| 2013-12-03 | 201312040603AM | 1.40 ppb |
| 2013-12-03 | 201312040562AM | 2.00 ppb |
| 2013-12-03 | 201312040591AM | 0.130 ppb |
| 2013-12-04 | 201312050165AM | 0.860 ppb |
| 2013-12-05 | 201312060285AM | 0.0650 ppb |
| 2013-12-09 | 201312100212AM | 1.60 ppb |
| 2013-12-09 | 201312100193AM | 0.650 ppb |
| 2013-12-09 | 201312100231AM | 1.60 ppb |
| 2013-12-09 | 201312100221AM | 0.460 ppb |
| 2013-12-09 | 201312100254AM | 0.470 ppb |
| 2013-12-10 | 201312110715AM | 2.60 ppb |
| 2013-12-10 | 201312110680AM | 0.240 ppb |
| 2013-12-11 | 201312120622AM | 0.540 ppb |
| 2013-12-16 | 201312170383AM | 1.80 ppb |
| 2013-12-16 | 201312170373AM | 0.340 ppb |
| 2013-12-16 | 201312170437AM | 0.470 ppb |
| 2013-12-16 | 201312170411AM | 0.420 ppb |
| 2013-12-16 | 201312170404AM | 0.150 ppb |
| 2013-12-17 | 201312180645AM | 1.70 ppb |
| 2013-12-17 | 201312180737AM | 1.20 ppb |
| 2013-12-18 | 201312200052AM | 0.910 ppb |
| 2014-03-05 | 201403060234AM | 1.20 ppb |
| 2014-03-05 | 201403060205AM | 0.0850 ppb |
| 2014-06-04 | 201406050007AM | 0.990 ppb |
| 2014-08-12 | 5810-035-1330 | ND |
| 2014-08-12 | 5810-016-1123 | 1.70 ppb |
| 2014-08-19 | 5810-057-1117 | ND |
| 2014-08-19 | 5810-029-0910 | 1.40 ppb |
| 2014-08-19 | 5810-022-1310 | 1.90 ppb |
| 2014-10-07 | 9590-013-1145 | 2.60 ppb |
| 2014-10-07 | 9590-010-1000 | 1.50 ppb |
| 2014-10-07 | 9590-008-1022 | ND |
| 2014-12-10 | 9590-023-1140 | ND |
| 2017-08-09 | 9590-057-1300 | ND |
| 2017-08-09 | 9590-022-1200 | 1.80 ppb |
| 2017-08-09 | 9590-029-1520 | 1.30 ppb |
| 2017-08-09 | 9590-030-1510 | 1.60 ppb |
| 2017-09-07 | 9590-023-1110 | ND |
| 2017-11-28 | 9590-013-1020 | 2.30 ppb |
| 2017-11-28 | 9590-016-1210 | 1.90 ppb |
| 2017-11-28 | 9590-010-1140 | 1.50 ppb |
| 2017-11-28 | 9590-008-1105 | ND |
| 2017-11-28 | 9590-024-1440 | ND |
| 2017-11-28 | 9590-032-1500 | 1.20 ppb |
| 2017-11-28 | 9590-035-1510 | ND |
| 2017-11-28 | 9590-037-1405 | 2.60 ppb |
| 2019-10-09 | 9590-024-1018 | ND |