UIC Technical Resources

This page provides guidance for engineers, consultants, municipalities, and facility owners designing, evaluating, or modifying subsurface wastewater disposal systems regulated under the Underground Injection Control (UIC) Program.

The manuals, templates, and tools below are intended to help applicants prepare complete and technically sound submissions that meet DEEP requirements.

Following this guidance before project submission can:

reduce requests for additional information,
shorten review timelines, and
help ensure consistency with DEEP expectations

Guidance documents supplement, but do not replace, regulatory or permit requirements. Applicants are required to coordinate with DEEP and complete a site investigation prior to final design of new systems.

Quick Links

Schedule a Site Investigation
DEEP Guidance Document for Design of Large-Scale On-Site Wastewater Renovation System
General Permit - Wastewater Management Plan
Nitrogen Dilution Calculator (coming soon)
Phosphorus Sorption (coming soon)
Reuse Guidelines
BMPs for Non-Domestic Wastewater Associated with Secondary, Trade, and Technical School Facilities
Compliance Audit (coming soon)
Contact Us

Stay Informed! New

Subscribe to our Newsletters

Industrial Insights: Regulatory development and industry news to keep you informed.
The Runoff Report: Timely stormwater updates and news delivered to your inbox.
The Groundwater Guardian: Stay up to date with UIC Program updates.

Get started today: Subscribe Now!

Schedule a DEEP Site Investigation

Before submitting an application and preparing plans, applicants must schedule a site investigation with the UIC Program Supervisor.

Email Us: DEEP.UICPermitting@ct.gov Subject Line: "Site Testing"

Technical Manuals and Calculators for Guidance on Designing Subsurface Disposal Systems

The Guidance Document of Design of Large-Scale On-Site Wastewater Renovation Systems (OWRS) is intended to provide information and methodologies for the design, construction, operation, and maintenance for those wastewater renovation systems which are under the Department's regulatory authority. This includes OWRS at:

Sites where the design flow is greater than 7,500 gallons per day, which may include multiple smaller systems.
Sites utilizing alternative treatment systems.
Sites utilizing community sewerage systems.

Guidance Document for Design of Large-Scale On-Site Wastewater Renovation System

Technical Submission Guide: Large-Scale On-Site Wastewater Design

Wastewater Management Plans

Applications for system repair, replacement, or expansion must include approvable technical plans. Most facilities permitted under the general permit must also submit a Wastewater Management Plan (WMP).

All plans and WMPs must be prepared, signed, and stamped by a Professional Engineer licensed in Connecticut.

Wastewater Management Plan Template

Wastewater Management Plan Submission Deadlines

Project Category	Submission Deadline
New Site	With Registration: Must be submitted as part of the initial application package.
Existing Site (with Flow Increase)	With Registration: Required at the time of filing due to the change in design flow.
Existing Site (Modification Only; No Flow Increase)	Post-Approval: Must be submitted within 1 year of registration approval.
Existing Site (No Modifications)	Post-Approval: Must be submitted within 2 years of registration approval.