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EWG's Tap Water Database — 2019 UPDATE

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MTBE

Three Valleys Municipal Water District

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.

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND70ND
2014ND50ND
2015ND40ND
2016ND40ND
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
2012-03-213761-004-1033ND
2012-03-213761-002-1100ND
2012-07-183761-004-0752ND
2012-07-183761-002-1015ND
2012-10-173761-002-0950ND
2013-03-053761-004-1045ND
2013-03-053761-002-1040ND
2013-07-163761-004-1005ND
2013-07-163761-002-1100ND
2013-09-173761-002-0000ND
2013-10-083761-004-0726ND
2013-10-083761-002-0920ND
2014-03-113761-004-1000ND
2014-03-113761-002-1030ND
2014-08-263761-004-1000ND
2014-08-263761-002-1020ND
2014-09-163761-002-1100ND
2015-03-103761-004-0000ND
2015-03-103761-002-0930ND
2015-07-143761-002-0840ND
2015-09-223761-002-0905ND
2016-03-153761-004-0915ND
2016-03-153761-002-0900ND
2016-07-193761-002-0930ND
2016-09-133761-002-1000ND
2017-03-213761-004-1100ND
2017-07-183761-002-0830ND
2017-09-123761-002-0900ND