Thallium

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Thalium is a naturally occurring metal released into the environment from metal smelting and coal burning. Exposure to too much thalium can cause hair loss, liver damage, reduced sperm motility and nervous system impairment.

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205

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	30	0	ND
2015	ND	41	0	ND
2016	0.0553 ppb	30	1	ND - 1.66 ppb
2017	ND	31	0	ND
2018	ND	41	0	ND
2019	ND	32	0	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for thallium 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 harm to internal organs.

EPA Maximum Contaminant
Level (MCL) 2 ppb

The legal limit for thallium, established in 1992, was based on analytical detection limits at the time that the standard was set.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-01-06	C316051-01	ND
2014-01-09	C316075-01	ND
2014-01-16	C316057-01	ND
2014-01-20	C316036-01	ND
2014-01-27	C316043-01	ND
2014-02-04	C316006-01	ND
2014-02-04	C316006-02	ND
2014-02-04	C316006-03	ND
2014-02-04	C316012-01	ND
2014-02-24	C316040-01	ND
2014-02-24	C316040-02	ND
2014-02-26	C316016-01	ND
2014-04-03	C404032-01	ND
2014-04-10	C403006-01	ND
2014-04-15	C404039-01	ND
2014-04-22	C404024-01	ND
2014-05-08	C402985-01	ND
2014-07-08	C407788-01	ND
2014-07-10	C407790-01	ND
2014-07-16	C407806-01	ND
2014-07-16	C407806-02	ND
2014-07-16	C408013-01	ND
2014-07-21	C407811-01	ND
2014-07-21	C408792-01	ND
2014-07-31	C407800-01	ND
2014-08-04	C409899-01	ND
2014-08-04	C409899-02	ND
2014-08-20	C407812-01	ND
2014-08-27	C410829-02	ND
2014-09-17	C411467-01	ND
2015-01-07		ND
2015-01-07		ND
2015-01-07		ND
2015-01-15		ND
2015-01-15		ND
2015-01-19		ND
2015-01-19		ND
2015-01-19		ND
2015-01-20		ND
2015-01-28		ND
2015-01-28		ND
2015-01-28		ND
2015-01-28		ND
2015-01-28		ND
2015-01-29		ND
2015-01-30		ND
2015-01-30		ND
2015-02-03		ND
2015-03-24		ND
2015-03-24		ND
2015-04-06		ND
2015-04-08		ND
2015-04-20		ND
2015-04-23		ND
2015-04-24		ND
2015-05-06		ND
2015-07-16		ND
2015-07-21		ND
2015-07-23		ND
2015-10-07		ND
2015-10-07		ND
2015-10-07		ND
2015-10-07		ND
2015-10-07		ND
2015-10-07		ND
2015-10-14		ND
2015-10-21		ND
2015-10-21		ND
2015-11-18		ND
2015-12-03		ND
2015-12-10		ND
2016-01-04	C515806-01	ND
2016-01-06	C515770-01	ND
2016-01-07	C515766-01	1.66 ppb
2016-01-07	C515772-01	ND
2016-01-07	C515776-01	ND
2016-01-07	C515782-01	ND
2016-01-07	C515787-01	ND
2016-01-07	C515824-01	ND
2016-01-13	C515801-01	ND
2016-01-13	C515801-02	ND
2016-03-17	C515831-01	ND
2016-03-23	CZ02853-01	ND
2016-04-18	CZ03128-01	ND
2016-04-19	CZ03119-02	ND
2016-04-20	CZ03124-02	ND
2016-04-20	CZ03163-01	ND
2016-04-20	CZ03163-02	ND
2016-04-25	CZ05708-01	ND
2016-05-03	CZ03137-02	ND
2016-05-16	CZ03159-01	ND
2016-05-17	CZ07300-01	ND
2016-05-19	CZ07383-01	ND
2016-06-14	CZ09075-01	ND
2016-07-21	CZ08296-01	ND
2016-10-03	CZ13730-01	ND
2016-10-12	CZ13735-01	ND
2016-10-14	CZ13738-01	ND
2016-10-14	CZ13741-01	ND
2016-11-09	CZ13736-01	ND
2016-11-09	CZ13736-02	ND
2017-01-16	CZ18688-01	ND
2017-01-17	CZ18653-01	ND
2017-01-17	CZ18675-01	ND
2017-01-17	CZ18682-01	ND
2017-01-17	CZ19034-01	ND
2017-01-18	CA00819-01	ND
2017-01-18	CZ18679-01	ND
2017-01-18	CZ18679-02	ND
2017-01-19	CZ18713-01	ND
2017-01-20	CZ18657-01	ND
2017-03-29	CZ18694-01	ND
2017-03-30	CA05012-01	ND
2017-04-17	CA02813-01	ND
2017-04-17	CA02835-01	ND
2017-05-05	CA02840-01	ND
2017-05-17	CA02858-01	ND
2017-06-02	CA02817-01	ND
2017-07-10	CA07666-02	ND
2017-07-13	CA07689-01	ND
2017-07-19	CA07674-01	ND
2017-07-19	CA07679-01	ND
2017-07-19	CA07690-01	ND
2017-07-19	CA07690-02	ND
2017-07-19	CA07690-03	ND
2017-07-19	CA07693-01	ND
2017-07-20	CA07879-01	ND
2017-07-21	CA11119-01	ND
2017-08-02	CA07684-02	ND
2017-08-09	CA07672-01	ND
2017-08-16	CA12508-01	ND
2017-08-30	CA12467-01	ND
2018-01-15	CA18133-01	ND
2018-01-15	CA18134-01	ND
2018-01-15	CA18134-02	ND
2018-01-22	CA18130-02	ND
2018-01-23	CA18132-01	ND
2018-01-23	CA18132-02	ND
2018-01-23	CB00989-01RE2	ND
2018-01-24	CA18116-01	ND
2018-01-29	CA18141-01	ND
2018-01-31	CA18114-01	ND
2018-01-31	CA18139-01	ND
2018-01-31	CA18193-04	ND
2018-02-01	CB01533-01	ND
2018-02-01	CB01533-02	ND
2018-02-20	CB02384-01	ND
2018-02-21	CA18175-01	ND
2018-02-21	CA18187-01	ND
2018-02-22	CA18171-01	ND
2018-02-22	CA18173-01	ND
2018-04-02	CB03258-01	ND
2018-04-16	CB03266-01	ND
2018-04-18	CB03229-01	ND
2018-04-18	CB03247-01	ND
2018-04-19	CB03222-01	ND
2018-04-25	CB03262-01	ND
2018-07-20	CB08096-01	ND
2018-07-25	CB08090-01	ND
2018-07-25	CB08097-01	ND
2018-09-25	CB14498-01	ND
2018-10-16	CB14299-01	ND
2018-10-23	CB14302-01	ND
2018-10-23	CB14304-01	ND
2018-10-26	CB14301-01	ND
2018-10-26	CB14301-02	ND
2018-10-26	CB14301-03	ND
2018-10-26	CB14301-04	ND
2018-10-26	CB14301-05	ND
2018-10-26	CB14301-06	ND
2018-10-26	CB14301-07	ND
2018-10-26	CB14301-08	ND
2018-10-26	CB14301-09	ND
2019-01-15	CB18633-01	ND
2019-01-15	CB18633-02	ND
2019-01-16	CB18616-01	ND
2019-01-23	CB18599-01	ND
2019-01-23	CB18603-01	ND
2019-01-23	CB18605-01	ND
2019-01-31	CB18609-01	ND
2019-02-05	CB18664-01	ND
2019-02-15	CB18657-01	ND
2019-02-21	CB18620-01	ND
2019-03-12	CB18636-01	ND
2019-03-26	CB19049-01	ND
2019-04-15	CC04000-01	ND
2019-04-15	CC04000-02	ND
2019-04-15	CC04000-03	ND
2019-04-17	CC04012-01	ND
2019-04-17	CC04051-01	ND
2019-04-17	CC04051-02	ND
2019-04-24	CC04047-01	ND
2019-04-25	CC06328-01	ND
2019-05-08	CC04006-01	ND
2019-05-08	CC04006-02	ND
2019-05-08	CC04022-01	ND
2019-05-08	CC04022-02	ND
2019-06-04	CC08605-01	ND
2019-09-16	CC10478-01	ND
2019-10-30	CC15776-01	ND
2019-10-31	CC15774-01	ND
2019-10-31	CC15774-02	ND
2019-11-07	CC15778-01	ND
2019-12-20	CC15769-01	ND
2019-12-30	CC15772-01	ND