MTBE

Beacon City

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.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2013	N/A	0	N/A
2014	ND	5	ND
2015	N/A	0	N/A
2016	ND	6	ND
2017	ND	8	ND
2018	ND	6	ND
2019	ND	8	ND

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
2014-04-02	420-76358-1	ND
2014-04-29	420-77175-2	ND
2014-04-29	420-77175-3	ND
2014-04-29	420-77175-1	ND
2014-05-28	420-78159-1	ND
2016-05-25	CB161094	ND
2016-11-29	CB164135	ND
2016-11-29	CB164133	ND
2016-11-29	CB164132	ND
2016-11-29	CB164131	ND
2016-11-29	CB164134	ND
2017-01-27	CB170251	ND
2017-01-27	CB170253	ND
2017-01-27	CB170252	ND
2017-11-29	CB172976	ND
2017-11-29	CB172979	ND
2017-11-29	CB172980	ND
2017-11-29	CB172978	ND
2017-11-29	CB172977	ND
2018-11-28	CB182680	ND
2018-11-28	CB182677	ND
2018-11-28	CB182678	ND
2018-11-28	CB182679	ND
2018-12-07	CB182842	ND
2018-12-07	CB182841	ND
2019-01-16	19A0608-02	ND
2019-01-16	19A0608-01	ND
2019-04-16	CB190937	ND
2019-07-17	19G0769-01	ND
2019-10-23	CB192647	ND
2019-10-23	CB192646	ND
2019-10-23	CB192649	ND
2019-10-23	CB192648	ND