Know Your Environment. Protect Your Health.

MTBE

City of Gustine

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
20191.50 ppb111.50 ppb
20201.20 ppb111.20 ppb
20212.50 ppb112.50 ppb
20221.60 ppb111.60 ppb
20231.50 ppb111.50 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
2018-02-27AE16039ND
2019-02-28AE566261.50 ppb
2020-04-21AF073731.20 ppb
2021-04-15AF503702.50 ppb
2022-05-19AF977841.60 ppb
2023-10-11AG594471.50 ppb