Thallium

South Island PSD

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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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	12	ND
2015	N/A	0	N/A
2016	N/A	0	N/A
2017	ND	12	ND
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 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
2014-02-04	AD35232	ND
2014-02-04	AD35252	ND
2014-02-04	AD35253	ND
2014-02-04	AD35231	ND
2014-02-10	AD35465	ND
2014-02-10	AD35468	ND
2014-02-10	AD35474	ND
2014-02-10	AD35475	ND
2014-04-14	AD38363	ND
2014-04-14	AD38376	ND
2014-04-14	AD38374	ND
2014-04-14	AD38360	ND
2017-01-26	AD88868	ND
2017-01-26	AD88859	ND
2017-01-26	AD88869	ND
2017-01-26	AD88856	ND
2017-01-26	AD88865	ND
2017-01-26	AD88870	ND
2017-01-26	AD88858	ND
2017-01-26	AD88866	ND
2017-01-26	AD88864	ND
2017-01-26	AD88863	ND
2017-01-26	AD88857	ND
2017-01-26	AD88867	ND