MTBE
Hemlock Mutual Water Company
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.
12
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 | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 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 |
|---|---|---|
| 2018-09-06 | CA1910053_001_001-201809060910 | ND |
| 2018-09-06 | CA1910053_002_002-201809060850 | ND |
| 2019-09-09 | CA1910053_001_001-201909091030 | ND |
| 2019-09-09 | CA1910053_002_002-201909091025 | ND |
| 2020-09-02 | CA1910053_002_002-202009020805 | ND |
| 2020-09-02 | CA1910053_001_001-202009020820 | ND |
| 2021-07-07 | CA1910053_002_002-202107071100 | ND |
| 2021-07-07 | CA1910053_001_001-202107071110 | ND |
| 2022-07-07 | CA1910053_001_001-202207071105 | ND |
| 2022-07-07 | CA1910053_002_002-202207071045 | ND |
| 2023-07-21 | CA1910053_002_002-202307210945 | ND |
| 2023-07-21 | CA1910053_001_001-202307211000 | ND |