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)
- Other NAICS codes 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 .
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $0 |
| FY2026 | $60,005 |
| FY2025 | $91,263 |
| FY2024 | $38,938 |
| FY2023 | $114,638 |
Top agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of Commerce | $36,865 | |
| 2 | Department of Health and Human Services | $23,140 |
Contract awards
Latest 5 listed here. See the rest on GovTribe.
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About the company
On Site Systems Inc., a Webster Groves, Missouri–based for-profit software manufacturer, sells environmental health and safety software tools, software maintenance and renewal services, and specialized radiation safety modules to federal civilian and defense health agencies as a prime contractor competing full-and-open with no set-aside designations across 42 awards totaling $1.9 million in combined potential value.
The vendor's customer base concentrates in health and medical IT. The top five customer organizations account for 57% of awards by count and 45% of combined potential value, anchored by the Uniformed Services University of the Health Sciences (9 awards, $366 thousand), the National Institute of Environmental Health Sciences (3 awards, $246 thousand), and the Army Medical Command (6 awards, $89 thousand). A gap separates award frequency from dollar concentration: USDA trails NIH NIEHS in award volume but carries nearly equal dollar value, signaling higher per-order magnitude. The Defense Health Agency, Veterans Health Administration Veterans Integrated Service Network 22, and the Air Force Space Command round out the active customer set.
Representative work includes a $309.4 thousand firm fixed-price purchase order from the Uniformed Services University of the Health Sciences (awarded September 2023, completing September 2026) for software upgrade and annual service work performed in Bethesda, Maryland; a $115.7 thousand EHSA software renewal and maintenance order from the National Institute of Environmental Health Sciences (awarded September 2022, completing September 2027); a $52.3 thousand Air Force Space Command purchase order (awarded August 2025, completing August 2026) for an Environmental Health and Safety Assistant Software Tool at Patrick Space Force Base, Florida; and a $39.8 thousand National Institute of Standards and Technology order (awarded September 2026, completing August 2028) for a Radiation Safety Assistance Module performed in Webster Groves. Award activity is sparse and episodic — one award per year across 2022–2023 and 2025–2026, with two awards recompeting inside the next twenty-four months carrying $156 thousand in combined potential value. The vendor operates entirely as a prime contractor with no subcontract footprint.
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
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 CAGE code?
On Site Systems Inc.'s CAGE code is 1QSS9, and its Unique Entity ID (UEI) is STLMHDJNX5C7.
How much has On Site Systems Inc. received in federal contracts?
Federal contracts obligated $91,263 to On Site Systems Inc. in fiscal year 2025 and $304,844 in fiscal years 2023 through 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
- Similar vendors