Wastewater collection and transfer systems must be classified in one of five classes. Classifications must be based on population served, design population, type of collection and transfer system, and the character and volume of wastes to be handled. Systems may be classified at the discretion of the department by reason of the incorporation in the system of special design features or complex features or characteristics unusually difficult to operate, conditions of flow, or a combination of such conditions and circumstances.

1. Class IA. All wastewater collection and transfer systems serving a population of less than five hundred persons.

2. Class I. All wastewater collection and transfer systems serving a population of five hundred to one thousand five hundred persons.

3. Class II. All wastewater collection and transfer systems serving a population of one thousand five hundred to fifteen thousand persons.

4. Class III. All wastewater collection and transfer systems serving a population of fifteen thousand to fifty thousand persons.

5. Class IV. All wastewater collection and transfer systems serving a population of fifty thousand persons or more.

History: Effective January 1, 2019; amended effective April 1, 2026.

General Authority: NDCC 23.1-07-06

Law Implemented: NDCC 23.1-07-03, 23.1-07-06