MTBE
Hartford
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.
14
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 | 1.65 ppb | 4 | 3 | ND - 2.50 ppb |
| 2019 | 1.35 ppb | 4 | 4 | 0.780 ppb - 2.40 ppb |
| 2020 | 1.53 ppb | 3 | 3 | 1.40 ppb - 1.70 ppb |
| 2021 | 2.20 ppb | 1 | 1 | 2.20 ppb |
| 2022 | 5.80 ppb | 1 | 1 | 5.80 ppb |
| 2023 | 4.60 ppb | 1 | 1 | 4.60 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 |
|---|---|---|
| 2018-01-15 | 8012323-01 | 1.90 ppb |
| 2018-05-15 | 8052957-01 | 2.50 ppb |
| 2018-07-23 | 8074417-01 | ND |
| 2018-10-16 | 8103480-01 | 2.20 ppb |
| 2019-01-14 | 9012448-01 | 2.40 ppb |
| 2019-05-20 | 9054161-01 | 1.20 ppb |
| 2019-07-16 | 9073599-01 | 0.780 ppb |
| 2019-11-18 | 9113327-01 | 1.000 ppb |
| 2020-01-27 | 0014692-01 | 1.40 ppb |
| 2020-05-20 | 0053840-01 | 1.50 ppb |
| 2020-08-11 | 0082578-01 | 1.70 ppb |
| 2021-09-21 | EI04364-01 | 2.20 ppb |
| 2022-08-31 | FI00240-01 | 5.80 ppb |
| 2023-07-24 | GG04303-01 | 4.60 ppb |