Official definition
This Canadian industry comprises establishments primarily engaged in operating sewer systems and sewage treatment facilities that collect, treat and dispose of wastewater.
Canadian industry
221320 Sewage treatment facilities
Installations d'épuration des eaux usées
Official classification fields for this page
Official classification fields taken from the current StatCan source bundle.
| Characteristic | Description |
|---|---|
| Official title | Sewage treatment facilities |
| Classification | NAICS Canada 2022 Version 1.0 |
| Publishing authority | Statistics Canada |
| Hierarchical level | Canadian industry |
| Parent code | 22132 - Sewage treatment facilities |
| International correspondence | E3700* |
| Source | https://www.statcan.gc.ca/en/subjects/standard/naics/2022/v1/index |
| Source verification | 2026-08-13 |
Canada-wide tax and filing context
Canada-wide business, tax, and filing context from the local country pack and tax pack.
| Characteristic | Description |
|---|---|
| Tax authority | Canada Revenue Agency (CRA) |
| Business identifier | Business Number (BN): 9-digit identifier with program account suffixes such as RT0001 for GST/HST, RP0001 for payroll, and RC0001 for corporate income tax. |
| Filing requirements | Business Number registration; Form T2125 (Statement of Business or Professional Activities) attached to T1; Form T2 (Corporation Income Tax Return); Form T5013; Form GST34 |
| Sector authority | No cluster authority recorded in the local country pack. |
Exclusions
- operating waste treatment or disposal facilities, other than wastewater (See 56221 Waste treatment and disposal (US))
Examples
- operating sewage treatment or disposal facilities
- operating sewage treatment or disposal facilities
- sewage treatment facilities
Who is this code for
This code typically applies to:
Also relevant for
Source: STATCAN_TITLE, 2026-08-13
Classification Confidence Score
5 of 6 factors passing
8/ 10
Verified official source — naics-scian-2022-structure-v1-eng.csv (2026-08-13)
International crosswalk — ISIC Rev. 4 mapping: E3700*
Previous edition migration — NAICS 2017 to 2022 continuity confirmed
Complete hierarchy — 5 levels confirmed in hierarchy
Size or threshold documented — SME thresholds documented in federal tax pack
Trade or export match — No direct HS code correspondence in current bundle
Legacy crosswalk — Legacy system (SIC 1980) retired in this region
Business Profiles
When you might need code 221320
These role examples come from the official title and example wording attached to this code.
01
221320
Sewage treatment facilities
Use this page when the business is directly described by the official title or definition for 221320 Sewage treatment facilities. It is the closest source-backed checkpoint before BN registration, GST/HST review, banking onboarding, or internal classification work.
02
221320
operating sewage treatment or disposal facilities
Use this page when the activity is described in the official StatCan example wording as operating sewage treatment or disposal facilities. Compare the definition, exclusions, and nearby codes here before attaching 221320 Sewage treatment facilities to a business file.
Business categories in this branch
A rotating set of business activity examples linked to this part of the Canadian hierarchy.
In this section
- 221320Sewage treatment facilities
Commonly confused with
56221 — Waste treatment and disposal
operating waste treatment or disposal facilities, other than wastewater (See 56221 Waste treatment...
ISIC Rev. 4 correspondence
E3700*Sewerage
Approximate correspondence
Sewage treatment facilities
US NAICS reference221320 - Sewage Treatment Facilities
Source row
221320Sewage treatment facilities
This page mirrors the source row from the structure CSV and the matching rows from the elements and crosswalk files.
Frequently asked questions
What does code 221320 cover?
Sewage treatment facilities: This Canadian industry comprises establishments primarily engaged in operating sewer systems and sewage treatment facilities that collect, treat and dispose of wastewater.
Which level of the hierarchy is 221320?
It is a canadian industry page in the NAICS Canada 2026 hierarchy.
What is the parent of 221320?
It rolls up to 22132 Sewage treatment facilities.
Should I stop at 221320 or go lower?
This page already points to the exact six-digit Canadian industry in the current site structure.
Are official inclusion notes attached to 221320?
No inclusion rows are attached to this page in the local elements file.
Are there exclusion notes for 221320?
Yes. 1 exclusion note(s) help separate this page from nearby codes.
Does 221320 include illustrative examples?
Yes. 3 example row(s) are available for boundary checking.
What kinds of businesses often start from this page?
Examples in this branch include Gas supply, Water systems, Power distribution, Utility maintenance.
Is there an ISIC mapping for 221320?
Yes. The page shows E3700* Sewerage.
Does this page show a US NAICS reference?
Yes. A same-code US reference is attached: Sewage Treatment Facilities.
Why are both English and French titles shown?
NAICS Canada is bilingual, so the page keeps both language titles visible for comparison and lookup.
Where does the page text come from?
From the local StatCan structure file, elements file, ISIC crosswalk, and the bundled US 6-digit reference workbook.