MTBE
Smithville
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.
10
Samples
0
Samples exceeding legal limit (MCL)
7
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 2 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 14.5 ppb | 4 | 4 | 12.0 ppb - 16.0 ppb |
| 2022 | 17.0 ppb | 2 | 2 | 16.0 ppb - 18.0 ppb |
| 2023 | 15.5 ppb | 2 | 2 | 15.0 ppb - 16.0 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 |
|---|---|---|
| 2018-05-15 | AJ89544 | ND |
| 2018-05-15 | AJ89545 | ND |
| 2021-11-11 | AK90633 | 16.0 ppb |
| 2021-11-11 | AK90634 | 15.0 ppb |
| 2021-12-08 | AK92237 | 12.0 ppb |
| 2021-12-08 | AK92238 | 15.0 ppb |
| 2022-05-02 | AL00129 | 18.0 ppb |
| 2022-05-02 | AL00130 | 16.0 ppb |
| 2023-03-07 | AL26835 | 15.0 ppb |
| 2023-03-07 | AL26836 | 16.0 ppb |