MTBE
East Walnut Grove [sws]
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.
7
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 | 1 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
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 |
|---|---|---|
| 2018-05-07 | CA3400106_007_007-201805070930 | ND |
| 2019-05-09 | CA3400106_007_007-201905090855 | ND |
| 2019-08-05 | CA3400106_001_001-201908051020 | ND |
| 2022-05-02 | CA3400106_007_007-202205020830 | ND |
| 2022-08-15 | CA3400106_001_001-202208150822 | ND |
| 2023-08-15 | CA3400106_001_001-202308151000 | ND |
| 2023-08-15 | CA3400106_007_007-202308151015 | ND |