MTBE
Cherry Creek Valley
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.
9
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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | 6.28 ppb | 1 | 1 | 6.28 ppb |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | 1.30 ppb | 3 | 3 | 1.000 ppb - 1.77 ppb |
| 2023 | 1.33 ppb | 5 | 5 | 1.000 ppb - 1.67 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 |
|---|---|---|
| 2020-03-02 | S943496 | 6.28 ppb |
| 2022-06-03 | S1185432 | 1.77 ppb |
| 2022-09-22 | S1230839 | 1.14 ppb |
| 2022-12-08 | S1256466 | 1.000 ppb |
| 2023-03-20 | S1277196 | 1.32 ppb |
| 2023-04-10 | S1282919 | 1.65 ppb |
| 2023-07-12 | S1287916 | 1.67 ppb |
| 2023-09-21 | S1288006 | 1.01 ppb |
| 2023-10-06 | S1313193 | 1.000 ppb |