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EWG's Tap Water Database — 2019 UPDATE

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MTBE

City of Hewitt

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
2012ND10ND
2013ND10ND
2014ND10ND
2015ND30ND
2016ND30ND
2017ND30ND

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
2012-01-12AB77664ND
2013-02-121302396002ND
2014-01-14AC38665ND
2015-03-23AC85649ND
2015-03-23AC85645ND
2015-03-23AC85655ND
2016-01-20AD19012ND
2016-01-20AD19002ND
2016-04-06AD32129ND
2017-04-03AD78087ND
2017-10-09AD99814ND
2017-10-31AE03236ND