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) (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
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
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)
Frequently Asked Questions (FAQ)
Is NAICS code 488390 valid in 2022? ▾
Yes, 488390 is a valid 6-digit 2022 NAICS national industry code representing 'Other Support Activities for Water Transportation' under Sector 48-49 in the official classification index.
What is the SBA size standard for NAICS code 488390? ▾
The Small Business Administration (SBA) has established a small business size standard of $47,000,000 for NAICS code 488390 (Other Support Activities for Water Transportation), calculated based on receipts.
What is the legacy SIC equivalent for NAICS 488390? ▾
According to official Census Bureau concordance tables, NAICS code 488390 (Other Support Activities for Water Transportation) maps to legacy 1987 Standard Industrial Classification (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.
Related Pages & Tools
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.
- NAICS 488390 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Other Support Activities for Water Transportation).
- 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.