MTBE
Geary
MTBE was used as gasoline oxygenation additive to boost the octane number. In 2005, MTBE was replaced by ethanol as a gasoline additive. MTBE causes cancers in rats.
8
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 |
|---|---|---|---|---|
| 2018 | ND | 4 | 0 | ND |
| 2019 | ND | 3 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 13 ppb
The EWG Health Guideline of 13 ppb for MTBE 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 |
|---|---|---|
| 2018-01-30 | SDWA-1228010-00 | ND |
| 2018-04-04 | SDWA-1251685-00 | ND |
| 2018-07-10 | SDWA-1280192-00 | ND |
| 2018-10-19 | SDWA-1313571-03 | ND |
| 2019-02-06 | SDWA-1338860-00 | ND |
| 2019-04-02 | SDWA-1361027-00 | ND |
| 2019-08-05 | SDWA-1392180-00 | ND |
| 2020-02-11 | SDWA-1456751-00 | ND |