Naphthalene
Treasure Island
NOTE: Treasure Island purchases water from San Francisco City Water System which is required to test for naphthalene. Sample information shown below was taken by 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.
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 | ND | 1 | 0 | ND |
| 2018 | ND | 13 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
All test results
NOTE: Treasure Island purchases water from San Francisco City Water System which is required to test for naphthalene. Sample information shown below was taken by San Francisco City Water System.
| 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 |