Asbestos
San Francisco Regional Water System
Asbestos is a mineral fiber introduced into water by the dissolution of asbestos-containing minerals and from decay of asbestos cement in water mains. Asbestos causes cancer when ingested or inhaled.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | N/A | 0 | 0 | N/A |
2015 | ND | 1 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | N/A | 0 | 0 | N/A |
2019 | ND | 5 | 0 | ND |
MFL = million fibers per liter
State and national drinking water standards and health guidelines
EPA Maximum Contaminant
Level (MCL) 7 MFL
The legal limit for asbestos, established in 1991, was based on toxicity studies in laboratory animals conducted in the 1980s.
MFL = million fibers per liter
All test results
Date | Lab ID | Result |
---|---|---|
2015-05-27 | 9590-001-1235 | ND |
2019-06-24 | 9590-034-1035 | ND |
2019-06-24 | 9590-035-1137 | ND |
2019-06-26 | 9590-031-1430 | ND |
2019-06-26 | 9590-032-0925 | ND |
2019-06-26 | 9590-033-1125 | ND |