MTBE
Georgetown Water Department
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.
61
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 | 7 | 0 | ND |
| 2019 | ND | 8 | 0 | ND |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | 0.0993 ppb | 14 | 1 | ND - 1.39 ppb |
| 2023 | 0.235 ppb | 22 | 4 | ND - 1.40 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 |
|---|---|---|
| 2018-03-14 | S769306 | ND |
| 2018-06-18 | S813747 | ND |
| 2018-06-25 | S792519 | ND |
| 2018-07-02 | S808292 | ND |
| 2018-08-30 | S824396 | ND |
| 2018-12-18 | 9948087-EVOC | ND |
| 2018-12-28 | S816944 | ND |
| 2019-01-28 | S860823 | ND |
| 2019-02-08 | L7103316-EVOC | ND |
| 2019-04-17 | S872273 | ND |
| 2019-08-22 | S848507 | ND |
| 2019-08-22 | S848509 | ND |
| 2019-09-26 | S909231 | ND |
| 2019-11-15 | S925389 | ND |
| 2019-11-15 | S925386 | ND |
| 2020-02-18 | S932571 | ND |
| 2020-05-04 | S952565 | ND |
| 2020-06-22 | S969544 | ND |
| 2020-06-22 | S969546 | ND |
| 2020-09-18 | S969760 | ND |
| 2020-10-05 | S977627 | ND |
| 2020-10-05 | S977621 | ND |
| 2021-03-17 | S1048421 | ND |
| 2021-08-10 | S1009067 | ND |
| 2021-11-12 | S1148457 | ND |
| 2022-02-16 | S1159447 | ND |
| 2022-04-07 | S1185506 | ND |
| 2022-04-07 | S1185434 | ND |
| 2022-06-30 | S1209331 | ND |
| 2022-06-30 | S1209329 | ND |
| 2022-06-30 | S1209322 | ND |
| 2022-06-30 | S1209324 | ND |
| 2022-06-30 | S1209327 | ND |
| 2022-09-16 | S1230815 | ND |
| 2022-10-06 | S1230981 | ND |
| 2022-10-06 | S1230979 | ND |
| 2022-10-06 | S1230983 | 1.39 ppb |
| 2022-10-10 | S1231009 | ND |
| 2022-10-10 | S1231007 | ND |
| 2023-03-24 | S1282875 | ND |
| 2023-03-24 | S1282873 | ND |
| 2023-03-24 | S1282871 | 1.40 ppb |
| 2023-03-24 | S1282869 | ND |
| 2023-03-24 | S1282867 | ND |
| 2023-06-26 | S1287829 | ND |
| 2023-06-26 | S1287827 | ND |
| 2023-06-26 | S1287825 | ND |
| 2023-06-30 | S1260840 | ND |
| 2023-06-30 | S1260837 | 1.21 ppb |
| 2023-09-13 | S1287683 | ND |
| 2023-09-13 | S1287695 | ND |
| 2023-09-28 | S1307835 | ND |
| 2023-09-28 | S1307841 | ND |
| 2023-09-28 | S1307839 | ND |
| 2023-09-28 | S1307837 | 1.21 ppb |
| 2023-09-28 | S1307833 | ND |
| 2023-11-21 | S1307974 | ND |
| 2023-11-21 | S1307971 | ND |
| 2023-11-21 | S1307969 | ND |
| 2023-11-21 | S1307968 | 1.36 ppb |
| 2023-11-21 | S1307966 | ND |