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Industry Code 4222 Construction of water supply and drainage works, updated according to Decision 36/2025/QD-TTg. To learn more about the details of industry code 4222, please refer to this article by VN Law Firm!

1. What is a business industry code?

Business industry codes are a series of numbers encoded to represent a specific business industry. Organizations and individuals, when preparing business registration documents, must use this business industry code table for registration. Level 4 industry codes (with 4 digits) are the codes used for business registration.

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

Level	Name	Code	Quantity
Level 1	Economic industry level 1	1 letter (from A to V)	22 industries
Level 2	Economic industry level 2	2 digits (following level 1)	87 industries
Level 3	Economic industry level 3	3 digits (following level 2)	259 industries
Level 4	Economic industry level 4	4 digits (following level 3)	495 industries
Level 5	Economic industry level 5	5 digits (following level 4)	743 industries

Example of industry code structure: Taking the example of the Food Production industry:

Level 1: C (Manufacturing)
Level 2: 10 (Food processing and production)
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 4222 Construction of water supply and drainage works

Industry Code	Industry Name
4222	Construction of water supply and drainage works

Industry Code 4222 Construction of water supply and drainage works

This group includes:

– Construction of pipelines and water systems such as:

+ Irrigation systems (canals), for example: irrigation works, clean water supply works, etc.;

+ Reservoirs.

– Construction of works for:

+ Wastewater drainage systems, including repair,

+ Wastewater treatment plants,

+ Pumping stations.

– Drilling for water sources, well drilling.

Excluded: Project management activities related to civil engineering construction works are classified under group 7110 (Architectural and related technical consulting activities).

3. Suggestions for recording Industry Code 4222 Construction of water supply and drainage works

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

– For conditional business investment lines regulated by other legal documents, the business line is recorded according to the regulations in those legal documents.

Suggestions for recording Industry Code 4222 Construction of water supply and drainage works:

Case 1: General

Industry Code	Industry Name
4222	Construction of water supply and drainage works

Case 2: Detailed

Industry Code	Industry Name
4222	Construction of water supply and drainage works Details: Construction of irrigation works

Case 3: Detailed

Industry Code	Industry Name
4222	Construction of water supply and drainage works Details: Construction, repair and installation of water supply and wastewater drainage systems

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

4. Services for changing business lines for companies and enterprises at VN Law Firm

The service of changing business lines for companies and enterprises at VN Law Firm helps clients save a significant amount of time and effort. With VN Law Firm, you will be provided with services for changing business lines for companies and enterprises, including:

Consulting on the process and procedures for changing and supplementing business lines;
Consulting clients on preparing necessary documents;
Drafting and on behalf of clients submitting documents for changing and supplementing the company’s or enterprise’s business lines at the Business Registration Office;
Monitoring documents, supplementing or correcting documents (if any) as required by the specialist;
Performing procedures to publish business registration information on the Information Portal;
Handing over the certificate of change in business lines;
Guiding clients on procedures to note after changing business lines…