SIC Code 4941 — Water Supply

4-digit industry in the 1987 Standard Industrial Classification — still requested by banks, insurers, SEC filings and legacy systems.

Code	4941
Title	Water Supply
System	SIC 1987 (final edition — replaced by NAICS in 1997)

The SIC was last revised in 1987 and officially superseded by NAICS in 1997, but it never fully disappeared: the SEC still tags EDGAR filings with SIC codes, and many banks, insurers and legacy databases keep requesting it. That is why converting between the two systems is still routine work.

NAICS equivalents of SIC 4941

From the official U.S. Census concordance (1987 SIC → 2002 NAICS). Where the 2002 code no longer exists in NAICS 2022, the closest current code is shown.

NAICS 2002	Title (2002)	Current 2022 code
221310	Water Supply and Irrigation Systems	221310 (same code)

Other SIC codes in 49xx

• 4911 — Electric Services
• 4922 — Natural Gas Transmission
• 4923 — Natural Gas Transmission and Distribution
• 4924 — Natural Gas Distribution
• 4925 — Mixed, Manufactured, or Liquefied Petroleum Gas Production and/or Distribution
• 4931 — Electric and Other Services Combined
• 4932 — Gas and Other Services Combined
• 4939 — Combination Utilities, Not Elsewhere Classified
• 4952 — Sewerage Systems
• 4953 — Refuse Systems
• 4959 — Sanitary Services, Not Elsewhere Classified
• 4961 — Steam and Air-Conditioning Supply

Data: 1987 SIC titles (OSHA/Census) and official Census concordance — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.