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 Three Forks, Montana (Round 2)

Site Information
Location: Three Forks, MT
Population: 1,728
Address: P.O. Box 187
Three Forks, MT 59752
Contact: Randy Johnston, Superintendent  
Demonstration Site: Well #2
Enclosed Space: None
Source Water: Ground Water
Maximum Daily Flow: 250 gpm
Existing Treatment: None
Arsenic Removal Technology: Kinetico Iron Removal Oxidation, Macrolite Filtration
Disposal Option: Gravity Sewer to Lagoon


Project Status
Cooperative Research and Development Agreement (CRADA) signed Completed
CRADA approved by legal Completed
EPA/contractor site visit Completed
Contractor/system agreement Completed
Plans submitted Completed
Plans approved Completed
Equipment installed Completed
Study began Completed
Study completed N/A
Six-month report cleared N/A
Final report cleared N/A


Source Water Quality
Analysis mg/L Analysis mg/L
Total As 0.072 pH – Units 7.4
As (III) N/A Ca N/A
As (V) N/A Mg 13.1
Fe <0.03 Na N/A
Mn N/A Chloride 19
PO4 0.86 Hardness as CaCO3 246
SiO2 49 T. Alkalinity as CaCO3 N/A
SO4 N/A TOC 65
NO3 – N 11.5 TDS 692

Note: All data provided by utility except as noted.
N/A = Not available


Tom Sorg

See Also

EPA’s Water Treatment Demonstration Project to Reduce Amount of Arsenic in Three Forks, MT, Drinking Water (PDF) (2 pp, 112 KB) June 2006

Federal Register Environmental Documents: Arsenic Treatment Demonstrations

How to Participate

Demo Site Information form (PDF) (2 pp, 57 KB)

Frequently Asked Questions

Publications on Arsenic

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