MTBE

The Village On Chopmist Hill

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	Detections	Range of results
2014	ND	3	0	ND
2015	ND	3	0	ND
2016	0.650 ppb	6	3	ND - 1.50 ppb
2017	0.467 ppb	3	1	ND - 1.40 ppb
2018	0.733 ppb	6	3	ND - 2.10 ppb
2019	0.400 ppb	3	1	ND - 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
2014-03-04	1401665-02_TO12	ND
2014-03-04	1401665-03_TO12	ND
2014-12-23	1406013-01_TO12	ND
2015-03-02	1501438-03_TO12	ND
2015-03-02	1501438-02_TO12	ND
2015-10-06	1504354-01_TO12	ND
2016-03-07	1601400-04_TO12	ND
2016-03-07	1601400-03_TO12	1.50 ppb
2016-04-04	1601696-01_TO12	ND
2016-09-19	1604661-01_TO12	1.20 ppb
2016-12-13	1605558-01_TO12	1.20 ppb
2016-12-13	1605558-02_TO12	ND
2017-03-06	1701380-01_TO12	ND
2017-03-06	1701380-02_TO12	1.40 ppb
2017-12-20	1705368-01_TO12	ND
2018-03-12	1801351-03_TO12	2.10 ppb
2018-03-12	1801351-02_TO12	ND
2018-06-27	1802743-01_TO12	1.20 ppb
2018-08-22	1803794-01_TO12	1.10 ppb
2018-12-27	1805033-01_TO12	ND
2018-12-27	1805033-02_TO12	ND
2019-03-11	1901295-03_TO12	ND
2019-03-11	1901295-02_TO12	1.20 ppb
2019-12-18	1905167-01_TO12	ND