PSC H346: Inspection – Water Purification and Sewage Treatment Equipment
H346 is the product and service code (PSC) federal agencies use for “Inspection – Water Purification and Sewage Treatment Equipment”, in the “Inspection Services” group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 1
- Federal contract spending, FY2025
- $3.6 million
- Share of contract dollars to small businesses, since FY2024
- 84%
Open count as of Oct 28, 2026, 5:43 PM ET. The search counts live, so its total can differ by a notice or two.
Open PSC H346 contracts with 2+ days to respond
- Legionella Water Testing
✦ The Department of Veterans Affairs' Network Contracting Office 22 in Long Beach, California is buying Legionella water testing (testing water systems for Legionella bacteria).
Due in 13 daysNov 10, 2026, 10:00 AM PSTThe AI summary flags this date. Check SAM.gov.
Where H346 sits in the PSC Manual
- Category: Service
- Group H: Quality Control, Test, Inspection
- Group H3: Inspection Services
- Code H346: Inspection – Water Purification and Sewage Treatment Equipment
NAICS codes used with PSC H346
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with H346 most often:
| NAICS | Industry | Spent, last 3 years | Open with PSC H346 |
|---|---|---|---|
| 562219 | Other Nonhazardous Waste Treatment and Disposal | $2 million | — |
| 541620 | Environmental Consulting Services | $1.6 million | 1 |
| 325998 | All Other Miscellaneous Chemical Product and Preparation Manufacturing | $1.3 million | — |
| 221310 | Water Supply and Irrigation Systems | $786,614 | — |
| 541380 | Testing Laboratories and Services | $478,508 | — |
| 237110 | Water and Sewer Line and Related Structures Construction | $390,911 | — |
Open contracts under each code, with any PSC: NAICS 562219 · NAICS 541620 · NAICS 325998 · NAICS 221310 · NAICS 541380 · NAICS 237110
Who buys under PSC H346
Agencies with the most contract dollars under H346 over the last three fiscal years, per USAspending.gov. Each name links to that agency's open contracts and buying history:
| Agency | Obligated |
|---|---|
| Department of Veterans Affairs | $3.7 million |
| U.S. Immigration and Customs Enforcement | $1.9 million |
| Federal Emergency Management Agency | $661,148 |
| Department of State | $394,942 |
| Department of the Air Force | $373,131 |
| National Park Service | $233,877 |
| Forest Service | $219,063 |
| Department of the Army | $205,919 |
Federal spending under PSC H346 by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $2.8 million |
| FY2025 | $3.6 million |
| FY2026 (incomplete) | $1.7 million |
Headline figures use FY2025, the last complete year. FY2026 is still incomplete and will rise until about early January 2027 as Defense data arrives: USAspending.gov publishes Defense contracts 90 days after they're signed.
Who wins PSC H346 contracts
| Company | Obligated, last 3 years |
|---|---|
| Cinka Construction & Consulting Services LLC | $1.9 million |
| Hyperion Biotechnology, Inc. | $1.4 million |
| The Maclean Group LLC | $1.3 million |
| Orenco Systems, Inc. | $390,911 |
| Environmental Construction Corp. | $270,237 |
| Barclay Water Management, Inc. | $218,470 |
| D & D Laboratory LLC | $218,371 |
| American Lady Vets Services, Inc | $167,049 |
| Kurita America Inc | $151,404 |
| HGS Engineering Inc | $146,671 |
Linked names have a FedReady profile, which shows the NAICS codes a business is registered as small under. Most large companies have none.
Large prime contractors (companies that hold the contract with the agency) subcontract part of their work to small businesses. See which primes subcontract, by NAICS code.
Research PSC H346 work
By the NAICS codes this work goes with, the one with the most spending first: who won recently, contracts ending soon, agencies' planned buys and the large primes that subcontract it, nationwide. Each code shows only the pages that exist for it:
- 562219 Other Nonhazardous Waste Treatment and Disposal: who won recently. Not available for 562219 yet: contracts ending in the next 12 months, planned buys or large primes that subcontract. Its NAICS page shows who buys it.
- 541620 Environmental Consulting Services: who won recently · planned buys · large primes that subcontract
- 325998 All Other Miscellaneous Chemical Product and Preparation Manufacturing: who won recently · contracts ending in the next 12 months · large primes that subcontract
Related PSC codes
- H310 Inspection – Weapons
- H311 Inspection – Nuclear Ordnance
- H312 Inspection – Fire Control Equipment
- H313 Inspection – Ammunition and Explosives
- H314 Inspection – Guided Missiles
- H315 Inspection – Aircraft and Airframe Structural Components
- H316 Inspection – Aircraft Components and Accessories
- H317 Inspection – Aircraft Launching, Landing, and Ground Handling Equipment
- H318 Inspection – Space Vehicles
- H319 Inspection – Ships, Small Craft, Pontoons, and Floating Docks
Frequently asked questions
What is PSC H346?
H346 is the service code in the federal Product and Service Code (PSC) Manual named “Inspection – Water Purification and Sewage Treatment Equipment”, under H (Quality Control, Test, Inspection) and H3 (Inspection Services). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC H346?
Most federal contract dollars under PSC H346 go with NAICS 562219 (Other Nonhazardous Waste Treatment and Disposal), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC H346?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. 1 open notice uses PSC H346 right now. FedReady can match new ones to your business and email you, free.
Keep going
Sources: SAM.gov Contract Opportunities, USAspending.gov and the PSC Manual. How we count.