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EWG's Tap Water Database — 2019 UPDATE

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MTBE

Clayton County Water Authority

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.

 

14

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND20ND
2014ND20ND
2015ND20ND
2016ND20ND
2017ND20ND

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
2012-03-05AH54187ND
2012-03-05AH54186ND
2012-07-25AH71225ND
2012-10-22AH82285ND
2013-04-16AH99124ND
2013-04-16AH99123ND
2014-02-10AI27791ND
2014-02-10AI27790ND
2015-02-17AI64998ND
2015-02-17AI64997ND
2016-02-05AJ05933ND
2016-02-05AJ05932ND
2017-04-18AJ53561ND
2017-04-18AJ53560ND