488390 — Other Support Activities for Water Transportation
Description
This industry comprises establishments primarily engaged in providing services to water transportation (except port and harbor operations; marine cargo handling services; and navigational services to shipping).
Illustrative Examples
- Floating drydocks (i.e., routine repair and maintenance of ships)
- Ship scaling services
- Marine cargo checkers and surveyors
Exclusions & Cross-References
- Ship painting--are classified in Industry 238320, Painting and Wall Covering Contractors;
- Providing ship janitorial services--are classified in Industry 561720, Janitorial Services;
- Operating port, harbor, or canal facilities--are classified in Industry 488310, Port and Harbor Operations;
- Providing dredging services--are classified in Industry 237990, Other Heavy and Civil Engineering
- Construction;
- Providing stevedoring and other marine cargo handling services (except warehousing)--are classified in
- Industry 488320, Marine Cargo Handling;
- Providing navigational services to shipping--are classified in Industry 488330, Navigational Services to
- Shipping;
- Providing ship overhauling or repairs in a shipyard--are classified in U.S. Industry 336611, Ship Building
- and Repairing; and
- Providing towing services on inland waters--are classified in U.S. Industry 483211, Inland Water Freight
Overview Facts
| NAICS Code | 488390 |
|---|---|
| Industry Title | Other Support Activities for Water Transportation |
| SBA Size Standard | $47,000,000 |
| U.S. Establishments | 759 (Census CBP, 2023) |
| IRS PBA Code | 488300 (rolled-up match) |
| Sectors Hierarchy | Sector 48-49 → 488 → 4883 |
| Source / Verified | US Census 2022 NAICS Manual, Census CBP / 2026-06-28 |
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 3731 - Ship Building and Repairing (via SIC1987:3731→NAICS1997:48839→2002:488390→2007:488390→2012:488390→2017:488390→2022:488390)
- SIC 4499 - Water Transportation Services, NEC (via SIC1987:4499→NAICS1997:48839→2002:488390→2007:488390→2012:488390→2017:488390→2022:488390)
- SIC 4785 - Fixed Facilities and Inspection and Weighing Services for Motor Vehicle Transportation (via SIC1987:4785→NAICS1997:48839→2002:488390→2007:488390→2012:488390→2017:488390→2022:488390)
- SIC 7699 - Repair Shops and Related Services, NEC (via SIC1987:7699→NAICS1997:48839→2002:488390→2007:488390→2012:488390→2017:488390→2022:488390)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC 1930 — Barges and Lighters, Cargo
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Related Resources & Compliance Guides
Further regulatory reference links for NAICS code 488390:
- Sector 48-49 Directory Hub — List of related industries in the Transportation and Warehousing sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.
Related Industries in 4883
Frequently Asked Questions (FAQ)
Is 488390 a valid 2022 NAICS code?
NAICS 488390 is 'Other Support Activities for Water Transportation', a 2022 U.S. national industry under Sector 48-49 (Transportation and Warehousing); the SBA small-business size standard is $47,000,000.
What is the SBA size standard for NAICS 488390?
The SBA small business size standard for NAICS 488390 is $47,000,000 (based on receipts).
What is the legacy SIC code mapping for 488390?
NAICS code 488390 maps to the legacy 1987 SIC codes: 3731 - Ship Building and Repairing, 4499 - Water Transportation Services, NEC, 4785 - Fixed Facilities and Inspection and Weighing Services for Motor Vehicle Transportation, 7699 - Repair Shops and Related Services, NEC.