MTBE
Marston PWS
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.
38
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 | 6.05 ppb | 4 | 4 | 4.72 ppb - 6.73 ppb |
| 2019 | 2.82 ppb | 4 | 2 | ND - 5.77 ppb |
| 2020 | 2.65 ppb | 6 | 3 | ND - 6.59 ppb |
| 2021 | 7.47 ppb | 8 | 8 | 5.07 ppb - 10.1 ppb |
| 2022 | 4.90 ppb | 8 | 6 | ND - 7.91 ppb |
| 2023 | 7.61 ppb | 8 | 8 | 6.43 ppb - 8.78 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 |
|---|---|---|
| 2018-03-06 | AD17523 | 6.70 ppb |
| 2018-05-02 | AD18671 | 6.73 ppb |
| 2018-07-11 | AD29590 | 6.03 ppb |
| 2018-10-11 | AD35068 | 4.72 ppb |
| 2019-01-08 | AD38381 | 5.50 ppb |
| 2019-04-10 | AD46672 | ND |
| 2019-07-11 | AD52717 | 5.77 ppb |
| 2019-10-17 | AD57379 | ND |
| 2020-01-12 | AD60699 | ND |
| 2020-01-12 | AD60698 | 6.59 ppb |
| 2020-07-15 | 2011774 | ND |
| 2020-07-15 | 2012319 | ND |
| 2020-10-18 | 2016644 | 4.20 ppb |
| 2020-10-18 | 2016645 | 5.13 ppb |
| 2021-01-10 | 2020243 | 5.07 ppb |
| 2021-01-10 | 2020244 | 6.63 ppb |
| 2021-04-12 | 2103857 | 10.1 ppb |
| 2021-04-12 | 2103856 | 8.05 ppb |
| 2021-07-11 | 2113867 | 9.17 ppb |
| 2021-07-11 | 2113866 | 7.29 ppb |
| 2021-10-18 | 2118176 | 7.37 ppb |
| 2021-10-18 | 2118175 | 6.05 ppb |
| 2022-01-12 | 2121678 | 7.54 ppb |
| 2022-01-12 | 2121677 | 5.93 ppb |
| 2022-04-13 | 2204414 | 6.42 ppb |
| 2022-04-13 | 2204415 | 7.91 ppb |
| 2022-07-18 | 2214867 | 5.00 ppb |
| 2022-07-18 | 2214868 | 6.38 ppb |
| 2022-10-10 | 2219710 | ND |
| 2022-10-10 | 2219709 | ND |
| 2023-01-08 | 2223379 | 7.96 ppb |
| 2023-01-08 | 2223378 | 6.48 ppb |
| 2023-04-12 | 2303545 | 8.78 ppb |
| 2023-04-12 | 2303544 | 8.01 ppb |
| 2023-07-19 | 2311776 | 7.44 ppb |
| 2023-07-19 | 2311777 | 7.96 ppb |
| 2023-10-18 | 2316887 | 6.43 ppb |
| 2023-10-18 | 2316888 | 7.83 ppb |