California Code of Regulations
Title 23 - Waters
Division 3 - State Water Resources Control Board and Regional Water Quality Control Boards
Chapter 26 - Wastewater Treatment Plant Classification, Operator Certification, and Contract Operator Registration
Article 2 - Classification of Wastewater Treatment Plants, Owner Reporting Requirements, and Criteria for a Class I Wastewater Treatment Plant
Section 3675 - Classification of Wastewater Treatment Plants
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Within 45 days of receiving the information required pursuant to section 3676(b) or (c), the Office of Operator Certification shall classify a wastewater treatment plant according to the following criteria:
WASTEWATER TREATMENT PLANT CLASSIFICATION TABLE
| Class | Wastewater Treatment Process | Design Flow (in million gallons per day) | |
| I | Primary.......................... | 1.0 or less | |
| Conventional Treatment Pond.......................... | All | ||
| II | Primary.......................... | Greater than 1.0 through 5.0 | |
| Biofiltration.......................... | 1.0 or less | ||
| Modified Treatment Pond.......................... | All | ||
| III | Primary.......................... | Greater than 5.0 through 20.0 | |
| Biofiltration.......................... | Greater than 1.0 through 10.0 | ||
| Activated Sludge.......................... | 5.0 or less | ||
| Sequencing Batch Reactor.......................... | 1.0 or less | ||
| Tertiary.......................... | 1.0 or less | ||
| IV | Primary.......................... | Greater than 20.0 | |
| Biofiltration.......................... | Greater than 10.0 through 30.0 | ||
| Activated Sludge.......................... | Greater than 5.0 through 20.0 | ||
| Sequencing Batch Reactor.......................... | Greater than 1.0 through 10.0 | ||
| Tertiary.......................... | Greater than 1.0 through 10.0 | ||
| V | Biofiltration.......................... | Greater than 30.0 | |
| Activated Sludge.......................... | Greater than 20.0 | ||
| Sequencing Batch Reactor.......................... | Greater than 10.0 | ||
| Tertiary.......................... | Greater than 10.0 |
(b) A wastewater treatment plant may be classified other than as indicated in subdivision (a) if:
(c) Satellite plants shall not be classified separately. A satellite plant and the main wastewater treatment plant shall be classified as a single wastewater treatment plant.
(d) Within 45 days of receiving written notice of any change in reportable items in section 3676(b) or (c), the Office of Operator Certification shall either reclassify the wastewater treatment plant or make a determination that the change does not result in a need for reclassification.
1. Amendment of article heading and section filed 6-24-92; operative 6-24-92 pursuant to Government Code section 11346.2(d) (Register 92, No. 26).
2. Editorial correction of subsection (b)(2) (Register 98, No. 13).
3. Amendment of section heading and subsections (a) and (b)(1) filed 3-27-98; operative 4-26-98 (Register 98, No. 13).
4. Amendment of article heading and section filed 1-28-2013; operative 4-1-2013 (Register 2013, No. 5).
Note: Authority cited: Sections 1058 and 13626, Water Code. Reference: Section 13626, Water Code.
