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Industry Code 3700 for Sewerage and Wastewater Treatment, updated according to Decision 36/2025/QD-TTg. To learn more about the details of industry code 3700, please refer to this article by VN Law Firm!

1. What is a business industry code?

A business industry code is a series of numbers coded to represent a specific business industry. Organizations and individuals, when preparing business registration documents, must use this business industry code table for registration. A 4-digit industry code (level 4) is the code used for business registration.

The Vietnam Standard Industrial Classification (VSIC) system, promulgated under Decision 36/2025/QD-TTg, has a hierarchical structure with 5 levels, from general to specific:

Level	Name	Code	Number
Level 1	First-level economic industry	1 letter (A to V)	22 industries
Level 2	Second-level economic industry	2 digits (based on Level 1)	87 industries
Level 3	Third-level economic industry	3 digits (based on Level 2)	259 industries
Level 4	Fourth-level economic industry	4 digits (based on Level 3)	495 industries
Level 5	Fifth-level economic industry	5 digits (based on Level 4)	743 industries

Example of industry code structure: Taking the food manufacturing industry as an example:

Level 1: C (Manufacturing)
Level 2: 10 (Food processing and manufacturing)
Level 3: 107 (Manufacture of other food products)
Level 4: 1075 (Manufacture of prepared meals and dishes)
Level 5: 10751 (Manufacture of prepared meals and dishes from meat)

2. Regulations on Industry Code 3700 for Sewerage and Wastewater Treatment

Industry Code	Industry Name
3700	Sewerage and Wastewater Treatment
37001	Sewerage
37002	Wastewater Treatment

Industry Code 3700 for Sewerage and Wastewater Treatment

37001: Sewerage

This group includes:

– Operation of sewerage systems including drainage networks (pipelines, sewers, canals, ditches, regulating lakes, etc.), stormwater and wastewater pumping stations, wastewater treatment facilities, and other auxiliary works for the purpose of collecting, transporting, draining stormwater and wastewater, preventing flooding, and treating wastewater;

– Collection and transportation of wastewater from users, for example in urban areas, industrial parks, economic zones, export processing zones, high-tech zones, concentrated rural residential areas through sewerage systems.

– Maintenance and upkeep of sewerage systems, including sewer cleaning.

This group also includes:

– Emptying and cleaning of cesspools, septic tanks, sumps, wastewater holding tanks, etc.;

– Industrial cleaning services.

Exclusions:

– Construction or repair of sewerage systems is classified under group 42220 (Construction of water supply and sewerage works);

– Cleaning and unblocking of drainage pipes in buildings is classified under group 43221 (Installation of water supply, sewerage, heating, and air-conditioning systems);

– Rental of portable toilets with direct water supply is classified under group 77309 (Rental of other machinery, equipment, and tangible goods without operator, not elsewhere classified).

37002: Wastewater Treatment

This group includes:

– Operation of wastewater and sludge treatment facilities for reuse, e.g., agricultural wastewater, industrial wastewater, street washing water, rainwater… or for artificial replenishment of groundwater;

– Treatment of wastewater and sludge (including domestic wastewater and other wastewater) using wastewater and sludge treatment facilities, e.g., sludge drying during wastewater treatment…;

– Maintenance and upkeep of wastewater and sludge treatment facilities.

Exclusions:

– Treatment of sludge generated from wastewater treatment processes using treatment technologies such as composting or biological decomposition like aerobic composting, anaerobic digestion, incineration… with or without energy recovery is classified under group 38302 (Recycling of non-metal waste and scrap);

– Treatment of polluted surface water and groundwater is classified under group 39000 (Remediation activities and other waste management services).

Industry Code 3700 Drainage and Wastewater Treatment

3. Suggestions for recording Industry Code 3700 for Sewerage and Wastewater Treatment

– When registering a new enterprise, when notifying changes to business lines, or when requesting a new Business Registration Certificate, the enterprise founder or enterprise selects the four-digit economic industry code from the Vietnam Standard Industrial Classification to record the business line(s) in the enterprise registration dossier. The business registration authority guides, cross-references, and records the enterprise’s business lines in the National Business Registration Database.

– For conditional business lines stipulated in other legal documents, the business lines are recorded according to the regulations in those legal documents.

Suggestions for recording Industry Code 3700 for Sewerage and Wastewater Treatment:

Case 1: General

Industry Code	Industry Name
3700	Sewerage and Wastewater Treatment

Case 2: Detailed

Industry Code	Industry Name
3700	Sewerage and Wastewater Treatment Details: Wastewater treatment (not operating at headquarters). Sewerage (not operating at headquarters).

Case 3: Detailed

Industry Code	Industry Name
3700	Sewerage and Wastewater Treatment Details: Sewerage and wastewater treatment activities

Case 4: Detailed

Industry Code	Industry Name
3700	Sewerage and Wastewater Treatment Details: Management and operation of urban, industrial, and rural sewerage systems; waste treatment and recycling systems. Management and operation of wastewater treatment plants.

Case 5: Detailed

Industry Code	Industry Name
3700	Sewerage and Wastewater Treatment Details: Investment in, and management of, sewerage systems.

Case 6: Detailed

Industry Code	Industry Name
3700	Sewerage and Wastewater Treatment Details: Sewerage and wastewater treatment (including domestic wastewater, common industrial wastewater, and hazardous wastewater)

Note: Depending on the specific industry code and local regulations, it may be necessary to provide detailed descriptions for the 4-digit industry code or commit to operating according to regulations.

4. Business Line Change Services for Companies and Enterprises at VN Law Firm

Business line change services for companies and enterprises at VN Law Firm significantly save clients time and effort. With VN Law Firm, you will receive business line change services for companies and enterprises, including:

Consultation on procedures for changing and supplementing business lines;
Advising clients on preparing necessary documents;
Drafting and submitting on behalf of clients the dossier for changing or supplementing the company’s or enterprise’s business lines at the Business Registration Office;
Monitoring the dossier, supplementing or amending the dossier (if any) as requested by the specialist;
Performing the procedure for publicly announcing enterprise registration information on the Information Portal;
Delivering the confirmation of business line change;
Guiding clients on necessary procedures to note after changing business lines…