On Site Systems Inc.
Webster Groves, MO
- UEI
- STLMHDJNX5C7
- CAGE
- 1QSS9
- Primary NAICS
- 541511 Custom Computer Programming 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
- 8780 Big Bend Blvd Ste D, Webster Groves, MO 63119, USA
- Website
- hpassist.com
- Employees
- 1-10
- Estimated annual revenue
- $1M-$10M
- Industry
-
- Industrials
- Capital Goods
- Construction & Engineering
- Construction
- 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 |
|---|---|---|---|
| OU15-FY26-008-new | National Institute of Standards and Technology | $36,865 | |
| Aftac environmental health and safety assistant software tool | Air Combat Command | $52,325 | |
| Software upgrade and annual service | Uniformed Services University of the Health Sciences | $123,094 | |
| Ehsa software | National Institute of Environmental Health Sciences | $115,700 | |
| Purchase of HP assist software | CDC Pittsburgh | $14,300 |
About On Site Systems Inc.
On Site Systems Inc. is a for-profit manufacturing and software services company headquartered in Webster Groves, Missouri, that has been registered to receive federal awards since January 2002. The company specializes in developing and delivering software solutions tailored to the operational and compliance needs of federal defense and civilian agencies. On Site Systems Inc. has established itself as a reliable provider of environmental health and safety software tools, along with broader IT infrastructure support and software maintenance services across multiple departments within the federal government.
The company's federal contract portfolio demonstrates substantial experience supporting defense and health-related agencies. On Site Systems Inc. was awarded a $52,325 firm fixed-price purchase order by the Air Force Space Command on August 31, 2025, for the development and delivery of an Environmental Health and Safety Assistant Software Tool for the Air Force Technical Applications Center, with performance at Patrick Space Force Base in Florida and completion targeted for August 30, 2026. The company also holds a $309,380 firm fixed-price purchase order awarded by the Uniformed Services University of the Health Sciences on September 15, 2023, for software upgrade and annual service work performed in Bethesda, Maryland, extending through September 14, 2026. Additionally, On Site Systems Inc. was awarded a $115,700 firm fixed-price purchase order by the National Institute of Environmental Health Sciences on September 24, 2022, for EHSA software renewal and maintenance services, with an ultimate completion date of September 23, 2027. All three contracts were awarded without small business set-asides, reflecting the company's established capabilities and track record. The cumulative ceiling value of these identified awards totals $477,405, and the company's contracting history indicates prior delivery of software upgrades, maintenance, and support services to the Department of Defense, Department of Health and Human Services, the National Institutes of Health, the Centers for Disease Control and Prevention, and the Office of Naval Research.
SBA capabilities narrative
Software Development, specializing in Web Based Radioactive material management, Hazardous Chemical Safety, Biological Safety & Protocol Tracking. We also have other Web based Safety programs
Quick answers
What is On Site Systems Inc.'s UEI?
On Site Systems Inc.'s Unique Entity ID (UEI) in SAM.gov is STLMHDJNX5C7.
What is On Site Systems Inc.'s CAGE code?
On Site Systems Inc.'s CAGE code is 1QSS9.
What is On Site Systems Inc.'s primary NAICS code?
On Site Systems Inc.'s primary NAICS code is 541511 (Custom Computer Programming Services).
Where is On Site Systems Inc. located?
On Site Systems Inc.'s physical address in SAM.gov is 8780 Big Bend Blvd Ste D, Webster Groves, MO 63119, USA.
Is On Site Systems Inc. registered in SAM.gov?
Yes. On Site Systems Inc.'s SAM.gov registration is active through July 14, 2027.
What is On Site Systems Inc.'s most recent federal award?
On Site Systems Inc.'s most recent federal contract award is OU15-FY26-008-new (1333ND26PNB150375), from National Institute of Standards and Technology, on September 1, 2026.
On GovTribe
See On Site Systems Inc.'s full federal record
- Federal contract awards
- IDV awards
- Funding analysis by agency, NAICS and set-aside
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