MTBE
Walnut Grove Utilities
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.
29
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 | N/A | 0 | 0 | N/A |
| 2021 | ND | 11 | 0 | ND |
| 2022 | ND | 8 | 0 | ND |
| 2023 | ND | 10 | 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 |
|---|---|---|
| 2021-03-18 | 7364282001V | ND |
| 2021-03-18 | 7364280001 | ND |
| 2021-04-22 | 7368589001 | ND |
| 2021-05-13 | 7371332001V | ND |
| 2021-07-21 | 7380944003A | ND |
| 2021-08-12 | 1085142-01 | ND |
| 2021-08-16 | 7384685001V | ND |
| 2021-09-07 | 7387721001A | ND |
| 2021-12-21 | 810-11047-1 | ND |
| 2021-12-21 | 810-11087-1 | ND |
| 2021-12-21 | 810-11089-1 | ND |
| 2022-03-14 | FWC0176-01V | ND |
| 2022-03-23 | 810-18980-1 | ND |
| 2022-07-11 | FWG0306 | ND |
| 2022-07-11 | FWG0324 | ND |
| 2022-07-11 | FWG0325A | ND |
| 2022-10-26 | FWJ0181-01 | ND |
| 2022-11-14 | FWJ0184 | ND |
| 2022-11-15 | FWJ0191 | ND |
| 2023-02-07 | FXB0061-01 | ND |
| 2023-02-07 | FXB0070-01 | ND |
| 2023-02-09 | FXB0077-01 | ND |
| 2023-04-04 | FXC0510 | ND |
| 2023-04-04 | FXC0539-01 | ND |
| 2023-04-05 | FXC0546-01 | ND |
| 2023-04-05 | FXC0561-01 | ND |
| 2023-04-06 | FXC0504-01 | ND |
| 2023-04-06 | FXD0264-01 | ND |
| 2023-08-02 | FXF0580-01 | ND |