Rhithron Associates Inc.
Missoula, MT
- UEI
- D21EKF7FZJ25
- CAGE
- 3FQ91
- Primary NAICS
- 541620 Environmental Consulting Services
- SAM.gov registration
- Active through
Company facts
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- NAICS codes registered in SAM.gov
- SAM.gov registration date
- Physical address
- 33 Fort Missoula Rd, Missoula, MT 59804, USA
- Website
- rhithron.com
- Employees
- 1-10
- Estimated annual revenue
- $0-$1M
- Profiles
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Recent federal awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| Macroinvertebrates analysis, klamath inventory network & monitoring network, jackson county, oregon | Pacific West Region | $18,050 | |
| Macroinvertebrates analysis, klamath inventory network & monitoring network, jackson county, oregon | Pacific West Region | $24,750 | |
| The national park service (NPS) at klamath inventory & monitoring network (klmn) has a requirement for the sampling… | Pacific West Region | $18,000 | |
| NR-IMD-170 romn stream BIO lab analysis | National Office | $15,000 | |
| Analysis of drift samples per the attached statement of need | National Oceanic and Atmospheric Administration | $0 |
About Rhithron Associates Inc.
Rhithron Associates Inc. is a woman-owned small business and self-certified small disadvantaged business located in Missoula, Montana, specializing in environmental consulting services with a focus on freshwater ecology and aquatic ecosystem monitoring. The company provides specialized scientific services to federal agencies, with a primary emphasis on macroinvertebrate analysis, inventory, and monitoring services. Registered in SAM.gov since 2003, Rhithron Associates Inc. has established itself as a key contractor for various federal agencies seeking ecological and biological assessment services.
The company has secured multiple federal contract awards primarily from agencies such as the National Park Service, U.S. Department of the Interior, National Oceanic and Atmospheric Administration, and USDA Forest Service. These contracts, ranging in value from $2,100 to $146,960, consistently involve macroinvertebrate sample processing, taxonomic identification, and aquatic habitat assessment services. Most of these contracts were awarded on a firm fixed-price basis, with some utilizing the Multiple Award Schedule (MAS) contract vehicle. While most awards were not set aside for specific small business programs, some contracts were designated as total small business set-asides, particularly those with the USDA Forest Service Southwestern Region and National Park Service.
In terms of grant activities, Rhithron Associates Inc. has engaged in sub-grant work, with a notable example being a $40,320 sub-award from the Environmental Management department of Indiana. This sub-grant involved complex scientific tasks including sample processing, organism identification, and creating a synoptic reference collection. The sub-grant required detailed taxonomic work, specifically processing Kicka samples with a minimum 300-organism count, identifying specimens to the lowest possible taxonomic level, and ensuring quality control through internal taxonomic review. This grant work demonstrates the company's capacity to perform intricate scientific research and analysis across different ecological monitoring projects.
Contract vehicles
SBA capabilities narrative
Taxonomic determinations of aquatic invertebrates; algae, periphyton, diatoms, phytoplankton, zooplankton, fish diet analyses, metric calculations; interpretive reports; statistical analysis of bio/habitat data; study design/consultation regarding sampling, analysis, and QA; field sampling.
Quick answers
What is Rhithron Associates Inc.'s UEI?
Rhithron Associates Inc.'s Unique Entity ID (UEI) in SAM.gov is D21EKF7FZJ25.
What is Rhithron Associates Inc.'s CAGE code?
Rhithron Associates Inc.'s CAGE code is 3FQ91.
What is Rhithron Associates Inc.'s primary NAICS code?
Rhithron Associates Inc.'s primary NAICS code is 541620 (Environmental Consulting Services).
Where is Rhithron Associates Inc. located?
Rhithron Associates Inc.'s physical address in SAM.gov is 33 Fort Missoula Rd, Missoula, MT 59804, USA.
Is Rhithron Associates Inc. registered in SAM.gov?
Yes. Rhithron Associates Inc.'s SAM.gov registration is active through September 15, 2027.
Which contract vehicles does Rhithron Associates Inc. hold?
Rhithron Associates Inc. holds a place on 2 federal contract vehicles, including MAS and PSS.
What is Rhithron Associates Inc.'s most recent federal award?
Rhithron Associates Inc.'s most recent federal contract award is Macroinvertebrates analysis, klamath inventory network & monitoring network, jackson county, oregon (140P8426P0066), from Pacific West Region, on August 28, 2026.
On GovTribe
See Rhithron Associates Inc.'s full federal record
- Federal contract awards
- IDV awards
- Contract vehicles
- Funding analysis by agency, NAICS and set-aside
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