Connecticut Department of Energy & Environmental Protection

DEEP headquarters at 79 Elm Street in Hartford has partially re-opened to staff and members of the public as of Tuesday, February 3. The DEEP records room has re-opened. The DEEP Central Permit Processing Unit (CPPU) will be open to the public starting on Wednesday, Feb. 4. For updates, click here

Water Regulating and Discharges

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  • Pretreatment Compliance Assistance

    Compliance Assistance for Industrial Pretreatment Permits

  • General Pretreatment Permit for Non-Significant Industrial User Discharges to Publicly Owned Treatment Works (Non-SIU GP)

  • Pretreatment Program

  • Municipal Stormwater

    The General Permit for the Discharge of Stormwater from Small Municipal Separate Storm Sewer Systems (MS4 General Permit) is the product of a mandate by the U.S. Environmental Protection Agency (USEPA) as part of its Stormwater Phase II rules in 1999. This general permit requires each municipality to take steps to keep the stormwater entering its storm sewer systems clean before that stormwater enters water bodies.

  • Stormwater Management

    Stormwater is water resulting from rain or snowmelt that runs off surfaces such as rooftops, paved streets, highways and parking lots. Stormwater results in significant pollution to surface water affecting primary contact recreation such as swimming and aquatic life use support. DEEP is working to engage stakeholders to prevent the introduction of pollutants into stormwater through its Non Point Source Pollution Management and Coastal Nonpoint Source Pollution Control Programs.

  • Agricultural Wastewater

    Agricultural wastewater generated from a variety of farm activities including animal feeding operations and the processing of agricultural products, can pollute surface and ground water if not properly managed.

  • Subsurface Sewage Treatment and Disposal Systems - Septic Systems

    Septic systems treat and disperse wastewater from individual or small numbers of homes and commercial buildings. The type and/or size of the septic system, determines what agency has regulatory authority.

  • 2007 Guidance Document for Design of Large-Scale On-Site Wastewater Renovation Systems

    The Guidance Document for 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.

  • DOT MS4 GP

  • CT Stormwater Quality Manual - Errata Sheet

    Errata Sheet for 2004 Connecticut Stormwater Quality Manual

  • Video Tutorial -- General Permit with modifications

    The following tutorial is an overview of the requirements of the General Permit for the Discharge of Stormwater Associated with Industrial Activity, effective October 1, 2011. The video presents general information on permit conditions, control measures, inspections, monitoring, benchmarks, impaired waters requirements, and a discussion of specific requirements for Sector G--Transportation and Public Works Facilities.

  • Commercial Stormwater

    The Stormwater Associated with Commercial Activity General Permit, found only in Connecticut, requires operators of large paved commercial sites such as malls, movie theaters, and supermarkets to undertake actions such as parking lot sweeping and catch basin cleaning to keep stormwater clean before it reaches water bodies.

  • Snow Removal Guidelines

    These guidelines have been developed to clarify DEEP recommendations to state and municipal officials, and others regarding the removal and disposal of snow accumulations from roadways and parking lots. For purposes of this guidance snow accumulations refers to snow banks and snowpiles that are removed by front-end loader or by loading on trucks for disposal.

  • Miscellaneous Industrial User (MIU) General Permit Notification for Vehicle Maintenance Wastewater Discharges 

    This page provides specific instructions to former registrants under the Vehicle Maintenance Wastewater general permit on how to complete the Discharge Notification Form to POTW Authority for the General Permit for Discharges from Miscellaneous Industrial Users (MIU GP).

  • Flow Proportioned Sample Collection Procedures

    The Regulations require flow proportioning for all daily composite samples. See RCSA Section 22a-430-3(a)(3) for more information. This requirement is often a major area of non-compliance for permittees.

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