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EWG's Tap Water Database — 2019 UPDATE

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MTBE

Concord Water Department

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND40ND
2014ND40ND
2015ND50ND
2016ND50ND
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
2012-08-16113258.01ND
2012-10-23115341.01ND
2012-10-23115341.02ND
2012-10-23115341.03ND
2012-10-23115341.04ND
2013-10-23125755.04ND
2013-10-23125755.03ND
2013-10-23125755.02ND
2013-10-23125755.01ND
2014-10-31137495.01ND
2014-10-31137495.02ND
2014-10-31137495.03ND
2014-10-31137495.04ND
2015-08-07146612.01ND
2015-10-15149110.01ND
2015-10-15149110.02ND
2015-10-15149110.03ND
2015-10-15149110.04ND
2016-08-05159131.01ND
2016-10-07161374.05ND
2016-10-07161374.04ND
2016-10-07161374.03ND
2016-10-07161374.02ND
2017-11-13175839.02ND
2017-11-13175839.03ND
2017-11-13175839.04ND
2017-11-13175839.05ND