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EWG's Tap Water Database — 2019 UPDATE

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MTBE

Lafayette

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND20ND
2014ND20ND
2015ND20ND
2016ND20ND
2017ND20ND

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2012-05-08AH59996ND
2012-05-08AH59995ND
2013-05-21AI02051ND
2013-05-21AI02050ND
2014-05-14AI40539ND
2014-05-14AI40538ND
2015-04-07AI74280ND
2015-04-07AI74279ND
2016-05-11AJ12003ND
2016-05-11AJ12002ND
2017-06-21AJ58196ND
2017-06-21AJ58195ND