MTBE
Ephrata Area Joint 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.
48
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 | 5 | 0 | ND |
| 2019 | ND | 5 | 0 | ND |
| 2020 | ND | 9 | 0 | ND |
| 2021 | ND | 9 | 0 | ND |
| 2022 | ND | 10 | 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 |
|---|---|---|
| 2018-01-04 | 7020609-01 | ND |
| 2018-01-05 | 8000628-01 | ND |
| 2018-04-09 | 8007939-01 | ND |
| 2018-07-15 | 8020415-01 | ND |
| 2018-10-01 | 8028440-01 | ND |
| 2019-01-02 | 8018023-01 | ND |
| 2019-01-08 | 9000133-01 | ND |
| 2019-04-02 | 7004831-01 | ND |
| 2019-07-02 | 7011943-01 | ND |
| 2019-10-07 | 9035881-01 | ND |
| 2020-01-03 | 21627527.00 | ND |
| 2020-04-06 | 22168746.00 | ND |
| 2020-04-13 | 22168797.00 | ND |
| 2020-04-13 | 22168796.00 | ND |
| 2020-07-13 | 22753748.00 | ND |
| 2020-07-17 | 22753825.00 | ND |
| 2020-07-21 | 22753826.00 | ND |
| 2020-10-07 | 23319882.00 | ND |
| 2020-10-14 | 23319957.00 | ND |
| 2021-02-12 | 24015876.00 | ND |
| 2021-02-26 | 24015899.00 | ND |
| 2021-04-08 | 24201055.00 | ND |
| 2021-04-14 | 24390922.00 | ND |
| 2021-07-01 | 24976232.00 | ND |
| 2021-07-01 | 24976233.00 | ND |
| 2021-07-16 | 24976344.00 | ND |
| 2021-10-05 | 25545653.00 | ND |
| 2021-10-08 | 25545726.00 | ND |
| 2022-01-05 | 26077510.00 | ND |
| 2022-01-31 | 26077710.00 | ND |
| 2022-02-08 | 26247111.00 | ND |
| 2022-04-04 | 26604666.00 | ND |
| 2022-04-05 | 26604698.00 | ND |
| 2022-07-11 | 27188734.00 | ND |
| 2022-07-12 | 27188820.00 | ND |
| 2022-07-22 | 27188979.00 | ND |
| 2022-10-10 | 27782891.00 | ND |
| 2022-10-25 | 27782938.00 | ND |
| 2023-01-09 | 28307551.00 | ND |
| 2023-01-24 | 28307783.00 | ND |
| 2023-01-24 | 28307805.00 | ND |
| 2023-04-14 | 28855566.00 | ND |
| 2023-04-14 | 28855565.00 | ND |
| 2023-07-11 | 29451542.00 | ND |
| 2023-07-18 | 29451601.00 | ND |
| 2023-08-29 | 29654924.00 | ND |
| 2023-10-31 | 30028755.00 | ND |
| 2023-10-31 | 30028754.00 | ND |