Know Your Environment. Protect Your Health.

MTBE

Theresa Waterworks

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.

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.40 ppb112.40 ppb
20192.60 ppb332.10 ppb - 3.30 ppb
20202.95 ppb222.70 ppb - 3.20 ppb
20213.60 ppb223.00 ppb - 4.20 ppb
2022N/A00N/A
2023N/A00N/A

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
2018-09-1210801032.40 ppb
2019-07-0211320202.10 ppb
2019-07-0211320192.40 ppb
2019-07-1611347833.30 ppb
2020-08-1212066062.70 ppb
2020-08-1212065543.20 ppb
2021-04-1212482544.20 ppb
2021-07-2012663143.00 ppb