Naphthalene
San Francisco City Water System
Naphthalene is a polycyclic aromatic hydrocarbon, or PAH, released from combustion of fossil fuels and waste incinerators, and also used as a moth repellent. PAHs increase the risk of cancer; damage the immune, nervous and reproductive systems; and can harm developing fetuses.
14
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | ND | 1 | 0 | ND |
| 2018 | ND | 13 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2017-06-19 | 9553-001-1015 | ND |
| 2018-01-11 | 9590-007-1115 | ND |
| 2018-03-06 | 9590-004-1031 | ND |
| 2018-03-06 | 9590-008-0914 | ND |
| 2018-03-08 | 9590-006-0925 | ND |
| 2018-04-17 | 9590-007-1055 | ND |
| 2018-06-12 | 9590-004-1058 | ND |
| 2018-06-12 | 9590-006-1012 | ND |
| 2018-06-12 | 9590-008-0930 | ND |
| 2018-07-17 | 9590-007-0519 | ND |
| 2018-09-18 | 9590-004-0855 | ND |
| 2018-09-18 | 9590-006-0945 | ND |
| 2018-09-18 | 9590-008-1025 | ND |
| 2018-10-17 | 9590-007-0730 | ND |