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EWG's Tap Water Database — 2021 UPDATE

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MTBE

City of San Jose - EVG/EDV/COY

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.

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35

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND120ND
2015ND50ND
2016ND20ND
2017ND80ND
2018ND40ND
2019ND40ND

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
2014-01-219590-005-0914ND
2014-01-219590-006-0839ND
2014-02-189588-012-0902ND
2014-03-271610-001-1130ND
2014-03-271610-002-1000ND
2014-03-271610-003-0810ND
2014-03-271610-004-0900ND
2014-04-151610-013-0852ND
2014-04-151610-011-0935ND
2014-06-251610-004-1130ND
2014-06-251610-003-0735ND
2014-08-051610-007-0920ND
2015-03-031610-005-1045ND
2015-03-031610-006-1015ND
2015-03-031610-007-0945ND
2015-06-091610-003-0740ND
2015-09-081610-004-0826ND
2016-06-141610-003-0750ND
2016-09-131610-004-0852ND
2017-01-171610-002-0835ND
2017-01-171610-004-0925ND
2017-01-171610-001-1036ND
2017-01-311610-003-0819ND
2017-05-021610-011-1006ND
2017-05-161610-012-1145ND
2017-09-125867-004-0943ND
2017-09-261610-013-1030ND
2018-01-161610-007-1140ND
2018-01-161610-006-1015ND
2018-01-161610-005-0855ND
2018-05-291610-003-0815ND
2019-01-151610-007-0830ND
2019-01-151610-006-0930ND
2019-01-151610-005-0845ND
2019-05-141610-012-0949ND