MTBE
Ridge Spring, Town of
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.
19
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 | 2.20 ppb | 4 | 4 | 1.48 ppb - 2.57 ppb |
| 2019 | 2.66 ppb | 4 | 4 | 2.29 ppb - 2.93 ppb |
| 2020 | 2.20 ppb | 3 | 3 | 1.41 ppb - 2.68 ppb |
| 2021 | 1.64 ppb | 4 | 4 | 1.43 ppb - 1.99 ppb |
| 2022 | 1.74 ppb | 3 | 3 | 0.930 ppb - 2.27 ppb |
| 2023 | 2.56 ppb | 1 | 1 | 2.56 ppb |
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 |
|---|---|---|
| 2018-01-17 | AE06217 | 2.39 ppb |
| 2018-05-02 | AE11636 | 1.48 ppb |
| 2018-07-18 | AE15231 | 2.57 ppb |
| 2018-10-17 | AE19864 | 2.35 ppb |
| 2019-02-27 | AE26426 | 2.61 ppb |
| 2019-04-02 | AE28055 | 2.29 ppb |
| 2019-07-16 | AE33704 | 2.93 ppb |
| 2019-11-25 | AE40764 | 2.82 ppb |
| 2020-02-11 | AE44279 | 2.50 ppb |
| 2020-04-22 | AE47574 | 2.68 ppb |
| 2020-12-09 | AE58678 | 1.41 ppb |
| 2021-02-24 | AE61854 | 1.99 ppb |
| 2021-06-24 | AE67917 | 1.49 ppb |
| 2021-07-21 | AE69291 | 1.43 ppb |
| 2021-11-17 | AE75295 | 1.65 ppb |
| 2022-01-12 | AE77416 | 2.27 ppb |
| 2022-04-20 | AE82499 | 2.02 ppb |
| 2022-11-16 | AE93064 | 0.930 ppb |
| 2023-10-18 | AF10384 | 2.56 ppb |