Thallium
Regional Water Authority
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.
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 | 10 | 0 | ND |
| 2015 | ND | 10 | 0 | ND |
| 2016 | ND | 10 | 0 | ND |
| 2017 | ND | 11 | 0 | ND |
| 2018 | ND | 10 | 0 | ND |
| 2019 | ND | 11 | 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 |
|---|---|---|
| 2014-02-25 | IOC1 200391600 | ND |
| 2014-02-25 | IOC1 200391616 | ND |
| 2014-02-25 | IOC1 200391617 | ND |
| 2014-02-25 | IOC1 200391618 | ND |
| 2014-02-25 | IOC1 200391619 | ND |
| 2014-02-25 | IOC1 200391620 | ND |
| 2014-02-25 | IOC1 200391653 | ND |
| 2014-02-25 | IOC1 200391599 | ND |
| 2014-05-13 | IOC1 200395860 | ND |
| 2014-05-13 | IOC1 200395855 | ND |
| 2015-02-10 | IOC1 200411859 | ND |
| 2015-02-10 | IOC1 200411862 | ND |
| 2015-02-10 | IOC1 200411860 | ND |
| 2015-02-10 | IOC1 200411845 | ND |
| 2015-02-10 | IOC1 200411846 | ND |
| 2015-02-10 | IOC1 200411863 | ND |
| 2015-02-10 | IOC1 200411876 | ND |
| 2015-05-05 | IOC1 200416148 | ND |
| 2015-05-05 | IOC1 200416168 | ND |
| 2015-05-05 | IOC1 200416175 | ND |
| 2016-02-09 | IOC1 200433411 | ND |
| 2016-02-09 | IOC1 200433414 | ND |
| 2016-02-09 | IOC1 200433412 | ND |
| 2016-02-09 | IOC1 200433413 | ND |
| 2016-02-09 | IOC1 200433479 | ND |
| 2016-02-09 | IOC1 200433397 | ND |
| 2016-02-09 | IOC1 200433398 | ND |
| 2016-02-09 | IOC1 200433415 | ND |
| 2016-02-09 | IOC1 200433425 | ND |
| 2016-05-12 | IOC1 200439513 | ND |
| 2017-03-21 | IOC1 200462777 | ND |
| 2017-03-21 | IOC1 200462742 | ND |
| 2017-03-21 | IOC1 200462743 | ND |
| 2017-03-21 | IOC1 200462757 | ND |
| 2017-03-21 | IOC1 200462756 | ND |
| 2017-03-21 | IOC1 200462741 | ND |
| 2017-03-21 | IOC1 200462740 | ND |
| 2017-03-21 | IOC1 200462739 | ND |
| 2017-03-21 | IOC1 200462793 | ND |
| 2017-06-20 | IOC1 200469812 | ND |
| 2017-06-20 | IOC1 200469827 | ND |
| 2018-03-12 | IOC1 200489766 | ND |
| 2018-03-14 | IOC1 200489913 | ND |
| 2018-03-14 | IOC1 200489914 | ND |
| 2018-03-14 | IOC1 200489871 | ND |
| 2018-03-14 | IOC1 200489885 | ND |
| 2018-03-14 | IOC1 200489884 | ND |
| 2018-03-14 | IOC1 200489868 | ND |
| 2018-03-14 | IOC1 200489870 | ND |
| 2018-03-14 | IOC1 200489867 | ND |
| 2018-11-29 | IOC1 200514112 | ND |
| 2019-03-18 | IOC1 200524895 | ND |
| 2019-03-19 | IOC1 200525057 | ND |
| 2019-03-19 | IOC1 200525060 | ND |
| 2019-03-19 | IOC1 200525058 | ND |
| 2019-03-19 | IOC1 200525059 | ND |
| 2019-03-19 | IOC1 200525077 | ND |
| 2019-03-19 | IOC1 200525078 | ND |
| 2019-03-19 | IOC1 200525061 | ND |
| 2019-03-19 | IOC1 200525097 | ND |
| 2019-03-19 | IOC1 200525098 | ND |
| 2019-05-08 | IOC1 200531297 | ND |