MTBE

Artesian Water Company

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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239

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	0.0754 ppb	48	4	ND - 1.69 ppb
2015	0.294 ppb	40	10	ND - 1.74 ppb
2016	0.332 ppb	45	13	ND - 2.10 ppb
2017	0.576 ppb	37	10	ND - 3.20 ppb
2018	0.585 ppb	32	8	ND - 3.80 ppb
2019	0.514 ppb	37	8	ND - 4.10 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
2014-01-06	L4892637-1	0.310 ppb
2014-01-06	L4892639-1	ND
2014-01-06	L4892644-1	ND
2014-02-05	L4935367-1	ND
2014-02-05	L4935370-1	ND
2014-02-07	L4935658-1	ND
2014-02-07	L4935658-2	ND
2014-02-18	L4768478-VOC	ND
2014-02-20	L4768585-VOC	ND
2014-02-20	L4799695-VOC	ND
2014-02-20	L4799863-1 VOC	ND
2014-02-25	L4805909-1 VOC	ND
2014-02-27	L4805818-VOC	ND
2014-02-27	L4830599-1 VOC	ND
2014-02-27	L4830758-VOC	ND
2014-02-27	L4836771-VOC	ND
2014-03-04	L4967359-1	ND
2014-03-04	L4967359-2	ND
2014-03-04	L4967360-1VOC	ND
2014-03-20	L4836863-1 VOC	ND
2014-03-20	L4949104-1	ND
2014-03-24	L4949106-1-VOC	ND
2014-03-24	L4949108-VOC	1.69 ppb
2014-03-24	L4949110-VOC	ND
2014-03-24	L4949113-VOC	ND
2014-04-01	L4991785-1	ND
2014-04-01	L4991785-2	ND
2014-04-03	L5006062-1	ND
2014-04-04	L5006551-1	ND
2014-05-01	L5030569-1	ND
2014-05-07	L5050389-1 VOC	ND
2014-05-19	L5062269-1	ND
2014-05-19	L5062269-2	ND
2014-05-30	L5959119-1-VOC	ND
2014-07-03	L5144791-1 VOC	ND
2014-08-04	L5193431-1	ND
2014-09-02	L5231075-1	ND
2014-09-02	L5231075-2	ND
2014-09-03	L5235055-1VOC	ND
2014-09-03	L5235055-2-VOC	ND
2014-10-03	L5274679-1	ND
2014-11-04	L5314270-1	ND
2014-11-04	L5314270-2	ND
2014-11-05	L5315635-1-VOC	ND
2014-11-05	L5315635-2-VOC	1.11 ppb
2014-12-15	L5359596-1-VOC	ND
2014-12-15	L5359597-1-VOC	ND
2014-12-15	L5359597-2-VOC	0.510 ppb
2015-01-06	L5393622-1	ND
2015-01-09	L5398026-1 VOC	ND
2015-01-26	L5242398-1 VOC	ND
2015-01-26	L5242399-1	ND
2015-01-26	L5242404-1 VOC	ND
2015-01-29	L524205-1 VOC	ND
2015-01-29	L5242406-1 VOC	0.890 ppb
2015-01-29	L5242407-1-VOC	ND
2015-01-29	L5242895-1-VOC	ND
2015-01-30	L5242896-1 VOC	ND
2015-01-30	L5250627-1 VOC	0.650 ppb
2015-01-30	L5250713-1 VOC	ND
2015-02-26	L5286929-1 VOC	ND
2015-03-02	L5287047-1-VOC	ND
2015-03-02	L5293036-1 VOC	1.000 ppb
2015-03-02	L5293104-1-VOC	ND
2015-03-31	L5511077-1	ND
2015-04-01	L5513705-1-VOC	ND
2015-04-15	L5536821-1-VOC	ND
2015-04-15	L5537277-1 VOC	1.30 ppb
2015-06-01	L5611916-1	ND
2015-06-01	L5611916-2	ND
2015-06-04	L5628778-1	ND
2015-06-22	L5661471-1	1.74 ppb
2015-07-01	L5676946-1	ND
2015-07-06	L5692593-1	1.21 ppb
2015-09-01	L5800237-1	ND
2015-09-01	L5800237-2	ND
2015-09-02	L5802388-1	ND
2015-09-02	L5802391-1	1.39 ppb
2015-09-23	L5534590-1 VOC	ND
2015-10-01	L5835730-1 VOC	0.770 ppb
2015-10-02	L5836565-1 VOC	1.69 ppb
2015-10-02	L5836566-1 VOC	1.10 ppb
2015-10-07	L5853905-1 VOC	ND
2015-11-02	L5899917-1	ND
2015-11-02	L5899917-2	ND
2015-12-10	L5590066-1 VOC	ND
2015-12-10	L5956173-1	ND
2015-12-10	L5956173-2	ND
2016-01-04	L5988545-1	0.900 ppb
2016-01-04	L5988546-1	ND
2016-01-04	L5988546-2	ND
2016-01-04	L5988547-1	ND
2016-01-05	L6006215-1	0.520 ppb
2016-01-05	L6006223-1	0.820 ppb
2016-01-15	L5762486-1 VOC	ND
2016-01-15	L5820919-1 VOC	ND
2016-01-15	L5863869-1 VOC	ND
2016-01-29	L6019360-1 VOC	ND
2016-01-29	L6019361-1 VOC	ND
2016-01-29	L6019362-1 VOC	ND
2016-02-01	L6053158-1	ND
2016-02-01	L6053158-2	ND
2016-02-17	L6019363-1 VOC	ND
2016-02-17	L6019364-1 VOC	ND
2016-02-17	L6019365-1 VOC	1.30 ppb
2016-02-23	L6019366-1 VOC	ND
2016-02-23	L6019367-1 VOC	ND
2016-02-23	L6019368-1 VOC	1.40 ppb
2016-02-23	L6019369-1 VOC	ND
2016-02-23	L6019370- VOC	ND
2016-03-28	L6142373-1 VOC	ND
2016-04-04	L6166403-1 VOC	ND
2016-04-07	L6170166-1 VOC	ND
2016-05-20	L6019372-1 VOC	ND
2016-06-06	L6019374-1 VOC	ND
2016-06-06	L6302168-1	ND
2016-06-10	L6307130-1	1.80 ppb
2016-06-16	L6319857-1	ND
2016-06-16	L6319857-2	ND
2016-06-21	L6326398-1	0.900 ppb
2016-07-06	L6359964-1	1.10 ppb
2016-07-08	L6361949-1	ND
2016-07-11	L6363789-1	0.600 ppb
2016-07-11	L6363789-2 VOC	0.600 ppb
2016-07-11	L6363790-1	ND
2016-07-11	L6363793-1	1.70 ppb
2016-08-05	L6390073-1 VOC	ND
2016-09-09	L6461769-1	ND
2016-10-04	L6499891-1	ND
2016-10-04	L6499893-1	ND
2016-10-05	L6502154-1	2.10 ppb
2016-10-05	L6502181-1	ND
2016-10-05	L6502183-1	1.20 ppb
2017-01-04	L6630039-1	3.20 ppb
2017-01-04	L6630041-1	ND
2017-01-06	L6631632-1	1.40 ppb
2017-01-18	L6547052-1 VOC	ND
2017-01-20	L6469070-1 VOC	ND
2017-01-20	L6469144-1 VOC	ND
2017-01-23	L6485710-1VOC	ND
2017-01-23	L6547102-1 VOC	ND
2017-01-23	L6553141-1 VOC	ND
2017-01-25	L6476340-1 VOC	ND
2017-01-25	L6476416-1 VOC	1.20 ppb
2017-01-25	L6476488-1 VOC	3.20 ppb
2017-01-25	L6476525-1 VOC	ND
2017-01-31	L6371963-1 VOC	ND
2017-01-31	L6372370-1 VOC	ND
2017-01-31	L6378581-1 VOC	ND
2017-03-06	L6485639-1 VOC	ND
2017-03-09	L6568580-1 VOC	ND
2017-04-04	L6752338-1 VOC	ND
2017-04-05	L6753806-1 VOC	3.20 ppb
2017-04-05	L6753806-2	ND
2017-04-06	L6754970-1 VOC	1.000 ppb
2017-04-13	L6763126-1 524	ND
2017-05-03	L6791948-1 VOC	ND
2017-06-13	L6851464-1	ND
2017-07-06	L6895433-1 VOC	3.00 ppb
2017-07-10	L6899909-1	0.900 ppb
2017-07-12	L6903562-1	ND
2017-07-14	L6904370-1	ND
2017-08-04	L6932965-1	ND
2017-09-13	L6950001-1	ND
2017-10-03	L6957608-1	ND
2017-10-03	L6957609-1	ND
2017-10-10	L6959282-1	1.10 ppb
2017-10-10	L6959284-1	3.10 ppb
2017-11-07	L6968999-1	ND
2017-12-06	7114325-01 VOC	ND
2018-01-05	8011810-01	ND
2018-01-05	8011820-01	ND
2018-01-10	8011813-01	0.920 ppb
2018-01-10	8011818-01	3.80 ppb
2018-01-26	8014291-01 VOC	ND
2018-01-26	8014295-01 VOC	ND
2018-03-01	8024104-01 VOC	ND
2018-03-01	8030886-01 VOC	ND
2018-03-01	8030887-01 VOC	ND
2018-03-05	8030881-01 VOC	ND
2018-03-05	8030882-01 VOC	ND
2018-03-05	8030888-01 VOC	ND
2018-03-06	8030883-01 VOC	3.80 ppb
2018-03-06	8030884-01 VOC	ND
2018-03-27	8034448-01 VOC	ND
2018-03-27	8034449-01 VOC	ND
2018-04-04	8034691-01	3.50 ppb
2018-04-09	8034683-01	ND
2018-04-20	8034686-01 VOC	1.000 ppb
2018-04-24	8044900-01	ND
2018-05-23	8053616-01 VOC	ND
2018-06-12	8061422-01	ND
2018-07-06	8071563-01 VOC	1.000 ppb
2018-07-06	8071568-01 VOC	3.40 ppb
2018-07-09	8071570-01 VOC	ND
2018-09-20	8093895-01 VOC	ND
2018-10-08	8101733-01 VOC	ND
2018-10-08	8101752-01 VOC	ND
2018-10-09	8101743-01 VOC	ND
2018-10-16	8101736-01 VOC	1.30 ppb
2018-10-16	8101741-01 VOC	ND
2018-11-21	8105267-01 VOC	ND
2019-01-04	8124609-01 SUVO	ND
2019-01-04	8124611-01 SUVO	ND
2019-01-10	8124601-01 SUVO	ND
2019-01-25	8122188-01 SUVO	ND
2019-01-25	8122189-01 SUVO	ND
2019-01-28	8122190-01 SUVO	ND
2019-01-30	8105269-01 SUVO	3.30 ppb
2019-02-27	9020961-01 SUVO	ND
2019-03-07	9014984-01 SUVO	ND
2019-03-07	9031310-01 SUVO	0.940 ppb
2019-03-07	9032813-01 SUVO	ND
2019-03-12	9020956-01 SUVO	ND
2019-03-14	9020955-01 SUVO	ND
2019-03-15	9020957-01 SUVO	ND
2019-03-15	9020959-01 SUVO	ND
2019-03-15	9020960-01 SUVO	ND
2019-03-21	9033622-01 SUVO	ND
2019-03-21	9033623-01 SUVO	ND
2019-03-28	9033626-01 SUVO	ND
2019-03-28	9034331-01 SUVO	ND
2019-04-10	9041997-01 SUVO	ND
2019-04-10	9042005-01 SUVO	4.10 ppb
2019-04-10	9043383-01 SUVO	ND
2019-04-12	9042017-01 SUVO	ND
2019-04-18	9042000-01 SUVO	0.980 ppb
2019-04-25	9045411-01 SUVO	ND
2019-07-03	9071966-01 SUVO	ND
2019-07-10	9071964-01 SUVO	3.60 ppb
2019-07-10	9071976-01 SUVO	ND
2019-07-11	9071956-01 SUVO	ND
2019-07-16	9071959-01 SUVO	1.10 ppb
2019-09-16	9085950-01 SUVO	ND
2019-10-02	9101662-01 SUVO	3.90 ppb
2019-10-04	9101657-01 SUVO	1.10 ppb
2019-10-08	9101674-01 SUVO	ND
2019-10-10	9101664-01 SUVO	ND
2019-10-18	9101655-01 SUVO	ND