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EWG's Tap Water Database — 2021 UPDATE

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MTBE

East Lyme Water & Sewer Commission

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.

MORE ABOUT THIS CONTAMINANT

 

74

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.444 ppb165ND - 2.50 ppb
20150.294 ppb164ND - 2.30 ppb
20160.217 ppb123ND - 1.30 ppb
20170.380 ppb102ND - 2.50 ppb
20180.430 ppb103ND - 1.50 ppb
20190.350 ppb103ND - 1.20 ppb

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
2014-03-0692331CHND
2014-03-0692332CHND
2014-03-0692333CH1.000 ppb
2014-03-0692330CHND
2014-05-1493438CHND
2014-05-1493439CHND
2014-05-1493440CHND
2014-05-1493441CH2.50 ppb
2014-07-1794365CHND
2014-07-1794367CHND
2014-07-1794366CHND
2014-07-1794364CHND
2014-10-2795928CH0.700 ppb
2014-10-2795929CHND
2014-10-2795930CH0.700 ppb
2014-10-2795931CH2.20 ppb
2015-02-0597295CHND
2015-02-0597297CH0.700 ppb
2015-02-0597296CHND
2015-02-0597294CHND
2015-05-0898758CH0.500 ppb
2015-05-0898759CHND
2015-05-0898760CHND
2015-05-0898761CH2.30 ppb
2015-08-12100413CHND
2015-08-12100414CHND
2015-08-12100415CHND
2015-08-12100416CH1.20 ppb
2015-10-15101616CHND
2015-10-15101617CHND
2015-10-15101618CHND
2015-10-15101619CHND
2016-02-04103394CHND
2016-02-04103395CHND
2016-02-04103396CH1.30 ppb
2016-02-04103392CHND
2016-02-04103391CHND
2016-02-04103393CHND
2016-05-02104825CHND
2016-05-02104826CH0.200 ppb
2016-08-01106398GEND
2016-08-01106399GEND
2016-12-06108644GEND
2016-12-06108645GE1.10 ppb
2017-01-31109466GEND
2017-01-31109465GEND
2017-05-09111182GEND
2017-05-09111183GEND
2017-05-09111184GEND
2017-05-09111185GE1.30 ppb
2017-09-14113544GEND
2017-09-14113545GE2.50 ppb
2017-12-11115013GEND
2017-12-11115014GEND
2018-02-06115853GEND
2018-02-06115856GE1.50 ppb
2018-02-06115854GEND
2018-02-06115855GEND
2018-05-22117860GEND
2018-05-22117861GEND
2018-09-07120043ND
2018-09-071200441.30 ppb
2018-12-18121897ND
2018-12-181218981.50 ppb
2019-03-06123279ND
2019-03-06123278ND
2019-06-27125673ND
2019-06-271256741.20 ppb
2019-09-10127389ND
2019-09-10127390ND
2019-09-10127391ND
2019-12-181294751.20 ppb
2019-12-18129476ND
2019-12-181294771.10 ppb