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EWG's Tap Water Database — 2019 UPDATE

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MTBE

California Water Service Co-leona Valley

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.

 

43

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND100ND
2013ND90ND
2014ND100ND
2015ND60ND
2016ND40ND
2017ND40ND

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
2012-01-245701-008-1250ND
2012-02-285701-006-1415ND
2012-02-285701-001-1410ND
2012-05-235701-006-1230ND
2012-05-235701-001-1215ND
2012-08-155701-006-1144ND
2012-08-155701-001-1136ND
2012-08-155701-008-1128ND
2012-11-195701-006-1210ND
2012-11-195701-001-1217ND
2013-01-225701-008-1135ND
2013-02-125701-006-1115ND
2013-02-125701-001-1100ND
2013-05-215701-001-1447ND
2013-08-265701-008-1202ND
2013-08-265701-006-1213ND
2013-08-265701-001-1220ND
2013-11-195701-006-1056ND
2013-11-195701-001-1045ND
2014-01-215701-008-1129ND
2014-02-185701-001-1113ND
2014-02-185701-006-1123ND
2014-05-275701-001-1212ND
2014-05-275701-006-1215ND
2014-08-255701-006-1055ND
2014-08-255701-008-1025ND
2014-08-255701-001-1040ND
2014-11-185701-001-1124ND
2014-11-185701-006-1130ND
2015-01-205701-008-1108ND
2015-02-175701-001-1116ND
2015-02-175701-006-1128ND
2015-05-195701-006-1021ND
2015-05-195701-001-1028ND
2015-08-185701-008-1055ND
2016-01-195701-008-1500ND
2016-05-245701-006-1238ND
2016-05-245701-001-1244ND
2016-08-039590-008-1045ND
2017-01-245701-008-1506ND
2017-05-025701-006-1241ND
2017-05-025701-001-1245ND
2017-08-225701-008-1525ND