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EWG's Tap Water Database — 2019 UPDATE

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MTBE

Washington Aqueduct Division

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.

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND100ND
2013ND80ND
2014ND80ND
2015ND80ND
2016ND80ND
2017ND80ND

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
2012-01-01McMillanND
2012-01-01DalecarliaND
2012-04-01DalecarliaND
2012-04-01McMillanND
2012-07-01DalecarliaND
2012-07-01McMillanND
2012-08-01DalecarliaND
2012-08-01McMillanND
2012-10-01DalecarliaND
2012-10-01McMillanND
2013-01-01DalecarliaND
2013-01-01McMillanND
2013-04-01DalecarliaND
2013-04-01McMillanND
2013-07-01DalecarliaND
2013-07-01McMillanND
2013-10-01DalecarliaND
2013-10-01McMillanND
2014-01-01DalecarliaND
2014-01-01McMillanND
2014-04-01DalecarliaND
2014-04-01McMillanND
2014-07-01DalecarliaND
2014-07-01McMillanND
2014-10-01McMillanND
2014-10-01DalecarliaND
2015-01-01DalecarliaND
2015-01-01McMillanND
2015-04-01DalecarliaND
2015-04-01McMillanND
2015-07-01DalecarliaND
2015-07-01McMillanND
2015-10-01DalecarliaND
2015-10-01McMillanND
2016-01-01DalecarliaND
2016-01-01McMillanND
2016-04-01DalecarliaND
2016-04-01McMillanND
2016-07-01DalecarliaND
2016-07-01McMillanND
2016-10-01DalecarliaND
2016-10-01McMillanND
2017-01-01DalecarliaND
2017-01-01McMillanND
2017-04-01DalecarliaND
2017-04-01McMillanND
2017-07-01DalecarliaND
2017-07-01McMillanND
2017-10-01DalecarliaND
2017-10-01McMillanND