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EWG's Tap Water Database — 2021 UPDATE

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MTBE

Monrovia 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.

MORE ABOUT THIS CONTAMINANT

 

32

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND50ND
2015ND50ND
2016ND50ND
2017ND50ND
2018ND70ND
2019ND50ND

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
2014-07-079588-008-0925ND
2014-07-079588-005-0930ND
2014-07-079588-004-0940ND
2014-07-079588-003-0900ND
2014-07-079588-002-0910ND
2015-07-159588-005-0910ND
2015-07-159588-008-0945ND
2015-07-159588-002-0955ND
2015-07-159588-004-0920ND
2015-07-159588-003-0930ND
2016-07-139588-002-0920ND
2016-07-139588-008-0905ND
2016-07-139588-005-0930ND
2016-07-139588-003-0910ND
2016-12-199588-004-0905ND
2017-08-079588-005-0940ND
2017-08-079588-008-1000ND
2017-08-079588-002-0950ND
2017-08-079588-003-0905ND
2017-10-179588-004-0920ND
2018-04-109588-008-0920ND
2018-04-109588-002-0850ND
2018-07-129588-005-0925ND
2018-07-129588-003-0915ND
2018-07-129588-008-0905ND
2018-07-129588-002-0950ND
2018-10-039588-004-0945ND
2019-07-169588-005-1035ND
2019-07-169588-002-1055ND
2019-07-169588-008-1115ND
2019-07-169588-003-1105ND
2019-10-219588-004-0825ND