MTBE
West Point, City 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.
25
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 | 0.933 ppb | 3 | 3 | 0.650 ppb - 1.33 ppb |
| 2019 | 0.503 ppb | 3 | 1 | ND - 1.51 ppb |
| 2020 | 1.02 ppb | 3 | 2 | ND - 1.78 ppb |
| 2021 | 0.887 ppb | 3 | 3 | 0.860 ppb - 0.910 ppb |
| 2022 | 0.614 ppb | 5 | 4 | ND - 0.940 ppb |
| 2023 | 0.585 ppb | 8 | 7 | ND - 0.990 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 |
|---|---|---|
| 2018-01-16 | 530842 | 1.33 ppb |
| 2018-09-24 | 571941 | 0.650 ppb |
| 2018-09-24 | 571940 | 0.820 ppb |
| 2019-01-14 | 592531 | 1.51 ppb |
| 2019-09-03 | 630428 | ND |
| 2019-09-03 | 630429 | ND |
| 2020-02-10 | 650614 | 1.78 ppb |
| 2020-09-14 | 689975 | 1.29 ppb |
| 2020-09-14 | 689974 | ND |
| 2021-01-19 | 713005 | 0.910 ppb |
| 2021-09-21 | 764409 | 0.860 ppb |
| 2021-09-21 | 764408 | 0.890 ppb |
| 2022-01-18 | 778908 | ND |
| 2022-09-12 | 822877 | 0.850 ppb |
| 2022-09-12 | 822878 | 0.940 ppb |
| 2022-12-05 | 835790 | 0.650 ppb |
| 2022-12-05 | 835789 | 0.630 ppb |
| 2023-03-06 | 851386 | 0.530 ppb |
| 2023-03-06 | 851387 | ND |
| 2023-06-19 | 864105 | 0.990 ppb |
| 2023-06-19 | 864104 | 0.550 ppb |
| 2023-09-06 | 879906 | 0.640 ppb |
| 2023-09-06 | 879907 | 0.640 ppb |
| 2023-12-05 | 891492 | 0.670 ppb |
| 2023-12-05 | 891491 | 0.660 ppb |