MTBE

Dover City PWS

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	20	ND
2015	ND	18	ND
2016	N/A	0	N/A
2017	N/A	0	N/A
2018	N/A	0	N/A
2019	N/A	0	N/A

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
2014-02-13	14021078	ND
2014-02-13	14021077	ND
2014-02-13	14021076	ND
2014-02-13	14021075	ND
2014-05-13	14051938	ND
2014-05-13	14051937	ND
2014-05-13	14051936	ND
2014-05-13	14051935	ND
2014-05-13	14051934	ND
2014-08-12	14081806	ND
2014-08-12	14081804	ND
2014-08-12	14081807	ND
2014-08-12	14081808	ND
2014-08-12	14081809	ND
2014-11-13	14111835	ND
2014-11-13	14111836	ND
2014-11-13	14111838	ND
2014-11-13	14111839	ND
2014-11-13	14111840	ND
2014-11-14	14111837	ND
2015-02-11	15021556	ND
2015-02-11	15021557	ND
2015-02-11	15021558	ND
2015-02-11	15021559	ND
2015-02-11	15021560	ND
2015-02-11	15021555	ND
2015-05-12	15052230	ND
2015-05-12	15052227	ND
2015-05-12	15052228	ND
2015-05-12	15052229	ND
2015-05-12	15052231	ND
2015-05-12	15052232	ND
2015-08-11	15081254	ND
2015-08-11	15081253	ND
2015-08-11	15081252	ND
2015-08-11	15081251	ND
2015-08-11	15081250	ND
2015-08-11	15081249	ND