EWG's Tap Water Database



Boh-nak Mobile Home Park

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20111.70 ppb111.70 ppb
20121.10 ppb111.10 ppb
20130.700 ppb110.700 ppb
20140.700 ppb440.600 ppb - 0.800 ppb
20150.645 ppb220.590 ppb - 0.700 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 13 ppb

The 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
2011-12-070220218_02_00318601.70 ppb
2012-04-040220218_02_00522601.10 ppb
2013-10-170220218_02_02048000.700 ppb
2014-03-060220218_02_00395600.700 ppb
2014-06-190220218_02_05503000.700 ppb
2014-08-140220218_02_00656000.800 ppb
2014-10-210220218_02_00149900.600 ppb
2015-02-120220218_02_00253100.700 ppb
2015-05-14E150035650010.590 ppb