No significant health risk

possible health risk

high health risk

 

West Thumb Rock Well
Click on the name of the contaminant for more information about possible health risks associated with that contaminant

Metal Contaminants

Danger
Name
Amount
Safe Limit*
Aluminum 39.0 1000
Arsenic 7.9 10
Barium 147.0 1000
Cadmium 0.0 5
Chromium 0.0 100
Iron 0.0 300
Lead 2.8 15
Mercury 0.0 2
Selenium 5.1 50
Thallium 0.0 2

all numbers are in micrograms per Liter

Radioactive Contaminants

Danger
Name
Amount
Safe Limit*
Lead-210 0.00 0.047*
Radium-226 0.00 5
Radium-228 0.00 5
Thorium-228 0.20 0.21*
Thorium-230 0.20 1.3*
Thorium-232 0.20 1.5*
Uranium-234 16.80 20
Uranium-235 0.90 20
Uranium-238 15.10 20
Alpha particles

12.20

 15
Beta paricles 14.10

50

all numbers are in picocuries per Liter

* The Safe Limit values for Lead-210, Thorium-228, Thorium-230, and Thorium-232 are based on the Preliminary Remediation Goals(PRG) for cleaning up contaminated sites. All other Safe Limit values are based on Maximum Contaminant Levels(MCL). Both values are determined by the USEPA.

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