MTBE
Palmer Center Ugarc
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.
30
Samples
0
Samples exceeding legal limit (MCL)
4
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 3 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | 17.9 ppb | 9 | 3 | ND - 112.0 ppb |
| 2021 | 1.22 ppb | 5 | 1 | ND - 6.10 ppb |
| 2022 | 19.0 ppb | 5 | 4 | ND - 58.6 ppb |
| 2023 | 0.820 ppb | 4 | 1 | ND - 3.28 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 |
|---|---|---|
| 2018-01-10 | UG180098POC | ND |
| 2018-05-09 | PC180872 | ND |
| 2018-10-09 | PC182388 | ND |
| 2019-01-07 | PC190059 | ND |
| 2019-04-24 | WD190998 | ND |
| 2019-07-17 | 07171903 | ND |
| 2019-10-14 | 10151907 | ND |
| 2020-01-06 | 01072016-POC | ND |
| 2020-04-22 | 04222018 | 44.4 ppb |
| 2020-05-12 | 05122005 | ND |
| 2020-06-01 | 06012004 | ND |
| 2020-07-01 | 07012020 | 112.0 ppb |
| 2020-07-20 | 07202003 | 4.70 ppb |
| 2020-08-11 | 08112028-1-RAW | ND |
| 2020-08-11 | 08112028-2-DS | ND |
| 2020-10-01 | 10012002-2 | ND |
| 2021-01-05 | 01052119-P | ND |
| 2021-01-25 | EHS2100013303P | ND |
| 2021-04-05 | 04052105N | ND |
| 2021-07-01 | 07012103 | ND |
| 2021-10-04 | 10042113 | 6.10 ppb |
| 2022-01-04 | 01042211 | 9.13 ppb |
| 2022-04-05 | 04052212 | ND |
| 2022-07-05 | 07052229 | 12.3 ppb |
| 2022-08-01 | 08012215-1 | 14.9 ppb |
| 2022-10-04 | 10042216-2 | 58.6 ppb |
| 2023-01-03 | 01032324-1 | 3.28 ppb |
| 2023-04-03 | 04032305 | ND |
| 2023-07-05 | PC232245 | ND |
| 2023-10-18 | 5530295 | ND |