MTBE

Rockford

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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100

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	21	ND
2015	ND	14	ND
2016	ND	6	ND
2017	ND	24	ND
2018	ND	26	ND
2019	ND	9	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
2014-01-21	4012700-06	ND
2014-01-21	4012700-05	ND
2014-01-22	4012700-02	ND
2014-01-27	4013503-02	ND
2014-01-31	4020631-01	ND
2014-01-31	4020631-02	ND
2014-01-31	4020631-03	ND
2014-02-18	4022291-01	ND
2014-02-18	4022294-01	ND
2014-02-25	4023202-01	ND
2014-04-03	4040726-01	ND
2014-04-03	4040814-01	ND
2014-04-16	4042720-05	ND
2014-04-16	4042720-03	ND
2014-04-16	4042720-02	ND
2014-04-16	4042720-04	ND
2014-04-16	4042720-01	ND
2014-10-17	4103510-02	ND
2014-10-17	4103510-03	ND
2014-10-28	4104356-01	ND
2014-12-05	4121752-01	ND
2015-02-06	5021724-01	ND
2015-04-08	5041268-01	ND
2015-04-15	5042507-02	ND
2015-04-22	5043417-01	ND
2015-05-12	5051947-04	ND
2015-05-12	5051947-02	ND
2015-05-12	5051947-01	ND
2015-05-20	5053045-02	ND
2015-06-17	5062896-01	ND
2015-06-23	5063877-01	ND
2015-10-27	5104115-02	ND
2015-11-04	5110645-06	ND
2015-11-04	5110645-05	ND
2015-11-18	5112827-01	ND
2016-04-13	6042243-01	ND
2016-04-26	6044110-02	ND
2016-08-10	6082098-01	ND
2016-08-17	6083403-01	ND
2016-10-12	6102040-01	ND
2016-11-09	6111726-03	ND
2017-01-06	7011622-02	ND
2017-01-06	7011622-01	ND
2017-01-13	7012600-02	ND
2017-01-13	7012603-03	ND
2017-01-13	7012603-01	ND
2017-01-20	7013468-02	ND
2017-01-20	7013468-01	ND
2017-01-20	7013468-04	ND
2017-01-20	7013468-03	ND
2017-01-27	7020195-01	ND
2017-02-03	7021369-02	ND
2017-02-10	7022427-01	ND
2017-03-15	7032200-01	ND
2017-05-26	7060081-03	ND
2017-05-26	7060081-01	ND
2017-06-09	7062750-05	ND
2017-06-27	7064968-01	ND
2017-06-28	7065205-01	ND
2017-09-22	7094621-01	ND
2017-10-20	7104443-01	ND
2017-10-20	7104443-02	ND
2017-10-27	7110218-01	ND
2017-12-06	7121184-04	ND
2017-12-06	7121184-01	ND
2018-01-29	18A0571-02_02	ND
2018-01-29	18A0571-01_02	ND
2018-02-02	8021162-01	ND
2018-03-16	8033673-02	ND
2018-03-16	8033673-01	ND
2018-04-06	8042289-03	ND
2018-04-06	8042289-02	ND
2018-04-06	8042289-01	ND
2018-05-04	8051899-02	ND
2018-05-04	8051899-01	ND
2018-05-23	8054284-03	ND
2018-05-23	8054284-02	ND
2018-05-23	8054284-01	ND
2018-05-25	8055076-02	ND
2018-05-25	8055076-01	ND
2018-05-30	18E1190-01_02	ND
2018-06-12	8062624-01	ND
2018-06-15	8063760-01	ND
2018-09-12	8092119-03	ND
2018-09-12	8092119-02	ND
2018-09-12	8092119-01	ND
2018-10-31	18K0014-01_02	ND
2018-11-02	8111425-02	ND
2018-12-05	18L0178-01_02	ND
2018-12-18	8123625-03	ND
2018-12-18	8123625-01	ND
2019-03-13	9032319-02	ND
2019-03-13	9032319-01	ND
2019-04-26	9050293-03	ND
2019-04-26	9050293-01	ND
2019-04-26	9050293-02	ND
2019-05-20	9054685-02	ND
2019-05-20	9054685-01	ND
2019-11-08	9112291-02	ND
2019-11-08	9112291-01	ND