MTBE
Chester Water Authority
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.
13
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 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2018-01-09 | 2287664001 | ND |
| 2019-07-10 | 3044796001 | ND |
| 2020-02-03 | 21499840.00 | ND |
| 2020-05-01 | 22019657.00 | ND |
| 2020-07-01 | 22412575.00 | ND |
| 2021-04-09 | 24244246.00 | ND |
| 2021-07-28 | 24825588.00 | ND |
| 2022-04-29 | 26461082.00 | ND |
| 2022-08-09 | 27230367.00 | ND |
| 2022-11-08 | 27819907.00 | ND |
| 2023-07-12 | 29299111.00 | ND |
| 2023-11-08 | 30068041.00 | ND |
| 2023-11-15 | 30068564.00 | ND |