MTBE
Gander Woods Pump District
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.
24
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 | 3.32 ppb | 1 | 1 | 3.32 ppb |
| 2019 | 3.19 ppb | 5 | 5 | 1.88 ppb - 4.41 ppb |
| 2020 | 2.88 ppb | 4 | 4 | 2.54 ppb - 3.31 ppb |
| 2021 | 2.97 ppb | 4 | 4 | 1.94 ppb - 3.70 ppb |
| 2022 | 2.42 ppb | 5 | 5 | 2.08 ppb - 3.04 ppb |
| 2023 | 1.81 ppb | 5 | 4 | ND - 2.76 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 |
|---|---|---|
| 2018-11-13 | S770725 | 3.32 ppb |
| 2019-01-29 | S812529 | 4.41 ppb |
| 2019-04-29 | S847907 | 3.50 ppb |
| 2019-08-13 | S865159 | 2.97 ppb |
| 2019-08-13 | S900434 | 3.18 ppb |
| 2019-10-15 | S895862 | 1.88 ppb |
| 2020-01-08 | S920014 | 2.78 ppb |
| 2020-04-16 | S901920 | 3.31 ppb |
| 2020-08-25 | S901704 | 2.88 ppb |
| 2020-10-13 | S998171 | 2.54 ppb |
| 2021-01-26 | S1035134 | 3.70 ppb |
| 2021-04-28 | S1066480 | 3.39 ppb |
| 2021-07-26 | S1086024 | 2.86 ppb |
| 2021-10-22 | S1121011 | 1.94 ppb |
| 2022-01-10 | S1136749 | 2.18 ppb |
| 2022-04-05 | S1120952 | 3.04 ppb |
| 2022-07-29 | S1199099 | 2.64 ppb |
| 2022-08-19 | S1206469 | 2.15 ppb |
| 2022-10-13 | S1230647 | 2.08 ppb |
| 2023-01-30 | S1257225 | 2.60 ppb |
| 2023-04-28 | S1257101 | 2.76 ppb |
| 2023-07-31 | 810-72350-9 | 1.80 ppb |
| 2023-10-31 | 810-83409-1 | 1.90 ppb |
| 2023-10-31 | 810-83409-2 | ND |