Alpha-hexachlorocyclohexane
California Water Service - San Carlos
NOTE: California Water Service - San Carlos purchases water from San Francisco Regional Water System which is required to test for alpha-hexachlorocyclohexane. Sample information shown below was taken by San Francisco Regional Water System.
Alpha-HCH is a byproduct of the production of the insecticide lindane, which is no longer used in the U.S. The International Agency for Research on Cancer has classified all forms of this chemical as possibly carcinogenic to humans.
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 | N/A | 0 | 0 | N/A |
| 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 | ND | 2 | 0 | ND |
ppb = parts per billion
All test results
NOTE: California Water Service - San Carlos purchases water from San Francisco Regional Water System which is required to test for alpha-hexachlorocyclohexane. Sample information shown below was taken by San Francisco Regional Water System.
| Date | Lab ID | Result |
|---|