NAICS Code 488390 — Other Support Activities for Water Transportation

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is the only national industry under 48839 (Other Support Activities for Water Transportation).

Code	488390
Title	Other Support Activities for Water Transportation
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	$47 million in average annual receipts

Official definition (2022 NAICS)

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

Is a business under 488390 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 488390 qualifies as a small business if it does not exceed $47 million in average annual receipts. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — receipts are averaged over the latest 5 fiscal years.

Where 488390 sits in the hierarchy

Level	Code	Title
Sector	48-49	Transportation and Warehousing
Subsector	488	Support Activities for Transportation
Industry Group	4883	Support Activities for Water Transportation
NAICS Industry	48839	Other Support Activities for Water Transportation
National Industry	488390	Other Support Activities for Water Transportation

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
3731	Ship Building and Repairing
4499	Water Transportation Services, Not Elsewhere Classified
4785	Fixed Facilities and Inspection and Weighing Services for Motor Vehicle Transportation
7699	Repair Shops and Related Services, Not Elsewhere Classified

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.