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EWG's Tap Water Database — 2019 UPDATE

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Thallium

Connecticut Water Company - Shoreline Region-chester System

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.

 

9

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND10ND
20140.467 ppb31ND - 1.40 ppb
2015ND10ND
2016ND20ND
2017ND10ND

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
2012-01-04071IOC1ND
2013-01-08247IOC1ND
2014-01-29140130CWCFIOC1ND
2014-08-13BG93531IOC1ND
2014-12-04BH49355IOC11.40 ppb
2015-02-12BH73176IOC1ND
2016-01-27BK58353IOC1ND
2016-05-25BN40398IOC1ND
2017-01-18BX33132IOC1ND