PSC H991

Overview

The Product Service Code (PSC) framework is a four-character, government‑wide taxonomy used to classify goods, services, and research and development acquired by U.S. federal agencies. PSCs are the standardized reporting codes used in systems such as the Federal Procurement Data System (FPDS) and SAM to enable consistent tracking, analysis, and reporting of procurement actions; the PSC Manual is the authoritative list and management reference. ¹

PSC H991 is an H‑group service code in the PSC Manual titled “Other Quality Control, Testing, and Inspection‑ Fuels, Lubricants, Oils, and Waxes.” It is intended to classify residual-category quality‑control, testing, or inspection services specifically related to fuels, lubricants, oils, and waxes for federal reporting and contracting purposes. Use of H991 is appropriate when the predominant contract line item is QC, test, or inspection services for these product types that do not fit a narrower H‑group code. ¹

See also on G2X:

• PSC H991
• PSC H391
• NAICS 541380

What this PSC covers

• Quality‑control services for fuel samples and fuel storage.¹
• Laboratory testing of lubricants and oils (chemical and physical analysis).¹
• Inspection and condition assessment of fuel systems and dispensing equipment.¹
• Testing and verification of waxes and specialty oils.¹
• Documentation, reporting, and certification tied to QC/test activities for fuels and oils.¹

Related NAICS and PSC codes

Type | Code | Descriptor

• | -: | - PSC | 9140 | Fuel Oils (product PSC listed in Group 91).
  PSC | 9150 | Oils and Greases: Cutting, Lubricating, and Hydraulic (product PSC).
  PSC | H391 | Inspection‑ Fuels, Lubricants, Oils, and Waxes (inspection service PSC related by subject area).

These related PSC entries are drawn from the Group 91 listings in the PSC Manual; specific NAICS crosswalks are determined per award and line item reporting. ¹

Typical federal use cases

• Contract line items for independent laboratory fuel‑quality testing and reporting (sample collection, lab analysis, final report) used by logistics or depot organizations.²
• Inspection and certification of above‑ground and underground fuel storage tanks, including fuel‑quality sampling and documentation.¹
• Condition assessment and routine QC programs for fuels and lubricants supporting fleet, aviation, or vessel operations.²

Frequently asked questions

• Q: What does PSC H991 specifically denote?
  A: PSC H991 denotes “Other Quality Control, Testing, and Inspection‑ Fuels, Lubricants, Oils, and Waxes” and serves as the residual H‑group code for QC, test, or inspection services focused on those product types when no narrower H‑code applies. ¹

• Q: Where is the authoritative definition of H991 published?
  A: The authoritative listing and text for H991 are in the Product and Service Codes (PSC) Manual published on Acquisition.gov, which is the official PSC reference for contracting and reporting. ¹

• Q: Which NAICS codes commonly appear with H991 in award reporting?
  A: NAICS choices vary by requirement, but testing and laboratory NAICS such as 541380 (Testing Laboratories) commonly pair with H991 on awards where laboratory analysis is the predominant effort; FPDS reporting shows examples of such pairings. ²

• Q: How should contracting officers choose H991 versus H391 or a numeric Group‑91 PSC?
  A: Choose the PSC that best represents the predominant work. Use the inspection‑specific PSC such as H391 for direct inspection tasks, use H991 for other QC/test/inspection activities that do not match narrower H‑codes, and select numeric product PSCs (for example, 9140) when the acquisition is primarily a supply purchase. Official guidance is in the PSC Manual. ¹

Useful resources

• G2X — PSC H991 overview (internal).
• Product and Service Codes (PSC) Manual — authoritative listing and definitions.¹
• FPDS‑NG Data Dictionary — description of FPDS elements and where PSC is reported.²
• FPDS ezSearch / help — search federal awards to see H991 usage examples.³

References

1. PSC Manual April 2025 (Product and Service Codes Manual, U.S. GSA). https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf

2. FPDS‑NG Data Dictionary (FPDS.gov). https://fpds.gov/wiki/index.php/V1.4_FPDS-NG_Data_Dictionary

3. FPDS ezSearch / help (FPDS.gov). https://www.fpds.gov/help/index.jsp