Notice: Industrial Pretreatment General Permit Issuances
The contributors to the Montville Sewers will need to adhere to the following:
The Department of Energy and Environmental Protection (DEEP) is pleased to announce the issuance of two updated General Pretreatment Permits designed to support Publicly Owned Treatment Works (POTWs) and improve compliance management:
- General Pretreatment Permit for Significant Industrial User, Dewatering, and Remediation Discharges (SIU GP) – previously the General Permit for Discharges of Wastewaters from Significant Industrial Users.
- General Pretreatment Permit for Non-Significant Industrial User Discharges to POTWs (Non-SIU GP) – previously the General Permit for Discharges from Miscellaneous Industrial Users (MIU GP).
These updated permits provide key benefits for POTWs, including:
Enhanced infrastructure protection and operational control
- More protective pH limits
- Temperature limits added
- Stronger prohibitions on PCBs and mercury
Comprehensive pollutant monitoring and source identification
- PFAS monitoring and minimization requirements
- Enhanced overall monitoring requirements
- More robust technical foundation for monitoring waivers
Improved administrative oversight and data collection
- Expanded permit coverage and application requirements
- Alignment of SIU and Non-SIU GP monitoring requirements
Streamlined digital application submissions
- New online form for Non-SIU GP
- Reduced administrative burden for POTWs
Key Dates for Both Permits
Issuance Date: October 29, 2025
Expiration Date: October 28, 2030
Applications Due: March 1, 2026 (For Existing Permittees)
Applications may be submitted starting December 1, 2025
New Resource for Town Officials: Pretreatment Permitting & Compliance Assistance Website
DEEP has launched a redesigned set of websites to help facilities and municipal staff navigate permit requirements and maintain compliance efficiently. These tools are designed to reduce uncertainty, build confidence, and streamline communication with DEEP staff.
Why This Matters to Your Town:
Reduce uncertainty: Clear, organized guidance helps you and your permittees understand obligations upfront.
Empower your staff: Step-by-step instructions give users confidence before reaching out to DEEP.
Streamline operations: Quick access to forms, guidance, and contacts saves time and resources.
These websites are invaluable for both new and experienced permittees and POTW Authorities, ensuring consistent, accurate, and efficient compliance with DEEP programs.
CT DEEP Industrial Pretreatment Program
Top Features for City Officials and Staff:
- Quick Links & Navigation: Easily access information for Industrial Users, Significant Industrial Users, Groundwater/Soil Remediation, and Construction/Dewatering projects.
- Self-Service Tools: Online forms, decision charts, and contact links simplify compliance tasks.
- Permit Guidance: Clear comparison of Individual vs. General Permits, helping determine the correct pathway.
- Compliance Instructions: Step-by-step guidance on reporting noncompliance, including online submissions and timelines.
- Step-by-Step Instructions: Clear guidance for applying, complying, and reporting.
- Helpful References: Direct links to forms, guidance, and program contacts.
- Transparency: Clear deadlines, reporting requirements, and enforcement expectations to avoid surprises.
- Confidence Builder: Staff and first-time applicants know exactly who to contact, what to do, and when — ensuring smooth compliance.
Learn more: Pretreatment Program, Pretreatment General Permit for Non-SIUs & Pretreatment General Permit SIU, Dewatering, & Remediation
Stay tuned for our upcoming Pretreatment Newsletter featuring updates, important deadlines, and compliance tips.
Questions? Contact the DEEP Pretreatment Program at DEEP.Pretreatment@ct.gov
