Chromium (hexavalent)
California Water Service (CWS) - King City
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).
29
Samples
0
Samples exceeding legal limit (MCL)
20
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | 0.757 ppb | 9 | 9 | 0.660 ppb - 1.000 ppb |
| 2014 | 0.498 ppb | 15 | 9 | ND - 1.40 ppb |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | 0.440 ppb | 5 | 2 | ND - 1.20 ppb |
| 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 |
|---|---|---|
| 2013-11-11 | 201311130398AM | 0.720 ppb |
| 2013-11-12 | 201311130391AM | 0.700 ppb |
| 2013-11-19 | 201311200662AM | 0.700 ppb |
| 2013-11-19 | 201311200645AM | 0.710 ppb |
| 2013-11-21 | 201311220583AM | 0.800 ppb |
| 2013-11-21 | 201311220567AM | 0.760 ppb |
| 2013-11-21 | 201311220573AM | 1.000 ppb |
| 2013-11-22 | 201311260225AM | 0.760 ppb |
| 2013-11-22 | 201311260216AM | 0.660 ppb |
| 2014-05-08 | 201405090478AM | 0.780 ppb |
| 2014-05-08 | 201405090489AM | 1.40 ppb |
| 2014-05-08 | 201405090470AM | 0.660 ppb |
| 2014-05-08 | 201405090504AM | 0.660 ppb |
| 2014-05-08 | 201405090510AM | 0.660 ppb |
| 2014-05-14 | 201405160444AM | 0.960 ppb |
| 2014-05-14 | 201405150134AM | 0.790 ppb |
| 2014-05-15 | 201405160462AM | 0.900 ppb |
| 2014-05-15 | 201405160454AM | 0.660 ppb |
| 2014-07-17 | 9590-015-1005 | ND |
| 2014-07-17 | 9590-014-1056 | ND |
| 2014-07-17 | 9590-008-1150 | ND |
| 2014-08-20 | 9590-012-1010 | ND |
| 2014-08-20 | 9590-007-1055 | ND |
| 2014-08-20 | 9590-006-1130 | ND |
| 2017-11-28 | 9590-012-1025 | ND |
| 2017-11-28 | 9590-008-1053 | 1.000 ppb |
| 2017-11-28 | 9590-007-0958 | ND |
| 2017-11-29 | 9590-014-1041 | 1.20 ppb |
| 2017-11-29 | 9590-006-1003 | ND |