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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  • 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.

  • Industrial Wastewater Discharge Permit Compliance Information

    How to maintain compliance with your individual discharge permit; a summary of key information and requirements that apply to your permit.

  • Common Violations and How To Avoid Them

    Common industrial wastewater violations and how to avoid them.

  • Industrial Waste Water Contact Information

  • What To Expect From An Inspection

    The Department of Energy and Environmental Protection (DEEP) conducts inspections at permitted facilities throughout the state. Under state law inspectors have the authority to enter your facility at reasonable times to evaluate compliance with your permit and the Water Discharge Permit Regulations of the State of Connecticut.

  • Notification Requirements

    Information regarding when it is necessary to contact the DEEP with permit related issues under CGS Section 22a-430.

  • 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).

  • 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.