Thallium

Utilities Inc. - North Park Water Supply

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.

MORE ABOUT THIS CONTAMINANT

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	2	ND
2015	N/A	0	N/A
2016	ND	10	ND
2017	ND	2	ND
2018	N/A	0	N/A
2019	ND	12	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
2014-02-19	AD89203	ND
2014-02-19	AD89203	ND
2016-05-17	AE06354	ND
2016-05-17	AE06350	ND
2016-05-17	AE06366	ND
2016-05-17	AE06362	ND
2016-05-17	AE06358	ND
2016-05-17	AE06350	ND
2016-05-17	AE06354	ND
2016-05-17	AE06358	ND
2016-05-17	AE06362	ND
2016-05-17	AE06366	ND
2017-01-23	AE12899	ND
2017-01-23	AE12899	ND
2019-02-26	B1900784-001	ND
2019-02-26	B1900784-005	ND
2019-02-26	B1900784-004	ND
2019-02-26	B1900784-003	ND
2019-02-26	B1900784-002	ND
2019-02-26	B1900784-001	ND
2019-02-26	B1900784-005	ND
2019-02-26	B1900784-004	ND
2019-02-26	B1900784-003	ND
2019-02-26	B1900784-002	ND
2019-10-15	B1904643-001	ND
2019-10-15	B1904643-001	ND