West Thumb Rock Well

Overview

Map of West Thumb Rock Well:

Longitude: -109 5 8.59        Latitude: 36 27 48.54


Image of West Thumb Rock Well:
Non-Radioactive Contaminants:
None
Radioactive Contaminants:
None


About this data: This data was collected by the US Army Corps of Engineers (USACE) and published by the US Environmental Protection Agency (US EPA) between 1994 and 2000. All raw data displayed on this website is in the public domain. An indication of "NA" for a particular contaminant means that contaminant was not tested for. The limits cited come from US EPA Maximum Contaminant Levels (MCLs). For those contaminants which do not have EPA MCLs (as indicated by a star), the preliminary remediation goals of the USACE availble were used instead. Information about health effects is derived from US government websites, to learn more, click the link next to each one. Please Note: Navajo Nation policy is that livestock-use-only wells are not to be used for human drinking water. Additionally, this website does not contain information about other possible contaminants this water source may have, such as E coli and various bacteria.

Raw Data

"MCL" stands for Maximum Contaminant Level, the highest allowable amount of a given contaminant in public drinking
water, as set by the US EPA. For those contaminants which do not have EPA MCLs (as indicated by a star), the preliminary
remediation goals of the US Army Corps of Engineers were used instead.

Download the EPA's dataset which includes this water source (large PDF file)
Stable Metallic Contaminants
Measurements in Micrograms per Liter (µg/L)
Contaminant Amount MCL
Aluminum (Al) 39.0 1,000
Antimony (Sb) 0 6
Arsenic (As) 7.9 50
Barium (Ba) 147.0 1,000
Beryllium (Be) 0 4
Cadmium (Cd) 0 5
Chromium (Cr) 0 100
Copper (Cu) 4.3 1,300
Iron (Fe) 0 300
Lead (Pb) 0 15
Manganese (Mn) 0 50
Mercury (Hg) 0 2
Nickel (Ni) 0 730*
Selenium (Se) 5.1 50
Silver (Ag) 0 100
Thallium (Th) 0 2
Vanadium (V) 21.3 260*
Zinc (Zn) 24.0 5,000
Radioactive Metallic Contaminants
Measurements in Pico-curies per Liter (pCi/L)
Contaminant Amount MCL
Alpha Particles 12.20 15
Beta Particles 14.10 50
Lead210 -0.20 0.047*
Radium226 0 5
Radium228 -1.900 5
Thorium228 0.200 0.21*
Thorium230 0.200 1.3*
Thorium232 0.200 1.5*
Uranium234 16.80 20
Uranium235 0.900 20
Uranium238 15.10 20
About this data: This data was collected by the US Army Corps of Engineers (USACE) and published by the US Environmental Protection Agency (US EPA) between 1994 and 2000. All raw data displayed on this website is in the public domain. The limits cited come from US EPA Maximum Contaminant Levels (MCLs). For those contaminants which did not have EPA MCLs (as indicated by a star), the preliminary remediation goals of the USACE availble were used instead. Information about health effects is derived from US government websites, to learn more, click the link next to each one. Please Note: Navajo Nation policy is that livestock-use-only wells are not to be used for human drinking water. Additionally, this website does not contain information about other possible contaminants this water source may have, such as E coli and various bacteria.

One comment about this water source so far:

  1. Brenda Holdridge says:

    Good morning, I live in Northwest Ohio and saw a segment on tv last sunday about the lack of water on the Navajo Reservation… I would like to help bring light to the problem in anyway I can if it’s possible. If you need grassroots volunteers or can direct me to any sites, I would appreciate it as this coverage brought tears to my eyes. Sincerely, Brenda Holdridge

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