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NAICS 221320

Sewage Treatment Facilities

Key Figures

Establishments
538
Census CBP · 2023
Employment
6,989
Census CBP · 2023
Market size
$2.4B
Census Economic Census · 2022

Figures are published for NAICS 221320 directly.

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Official definition

This industry comprises establishments primarily engaged in operating sewer systems or sewage treatment facilities that collect, treat, and dispose of waste.

Source: US Census Bureau, 2017 NAICS Definitions. Public domain.

Which code does this activity belong in?

Sewage treatment facilities operate systems that collect, treat, and dispose of waste through sewer networks and treatment plants. The boundary with water supply systems lies in the direction of flow: sewage treatment handles waste leaving communities, whereas water supply and irrigation systems deliver clean water to users. Steam and air-conditioning supply operates entirely separate utility infrastructure for heating and cooling purposes, not wastewater management.

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Where this sits

22 Utilities221 Utilities2213 Water, Sewage and Other Systems22132 Sewage Treatment Facilities