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

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  • Air Compliance Assurance - Enforcement

    Learn about administrative enforcement actions which are part of a compliance assurance program that provides certainty to the regulated community and public at large that the regulations of Connecticut state agencies will be enforced.

  • Air Compliance Assurance - Forms

    Access various air compliance reporting forms which provide systematic communication between DEEP and the regulated community.

  • Significant Environmental Hazards

    Section 22a-6u of the Connecticut General Statutes (CGS) requires the owner of property which is the source or location of pollution causing a significant environmental hazard to notify the Department of Energy & Environmental Protection (DEEP) after they become aware of such conditions.

  • Common Forms

    Permit & Licenses Common Forms

  • Quality Assurance and Quality Control

    An evaluation of the quality of the analytical data in relation to its intended use is important in order for the environmental professional to make decisions which are supported by data of known and sufficient quality.

  • What Do I Do With...?

  • Weather / Tides / Streamflows

    Connecticut marine tides, currents, weather, watches, warnings, advisories, sunrise, streamflows and sunset information.

  • Water Quality (305b) Report to Congress

    The DEEP Water Monitoring Group conducts annual water quality monitoring to evaluate the physical, chemical and biological condition of the State’s waters. Group staff collect a wide variety and large quantity of information each year, including water chemistry data, water temperature data, bacteria data, biological community data (fish, macroinvertebrates, diatoms) and tissue contaminant data.

  • Municipalities

    Municipalities play an important role in Connecticut's Aquifer Protection Area Program.

  • DEEP Announces the Immediate Closure of West Rock Ridge Cliff Face Due to Nesting Peregrine Falcons

    The Connecticut Department of Energy and Environmental Protection (DEEP) announced that effective immediately, a section of the West Rock Ridge cliff face at West Rock Ridge State Park in New Haven will be closed for purposes of recreation safety and the protection of state-threatened peregrine falcons.

  • Bat Appreciation Day to Be Held at Old New-Gate Prison and Copper Mine Sept. 10

    (HARTFORD)—Join the Connecticut Department of Energy and Environmental Protection (DEEP) Wildlife Division and the Department of Economic and Community Development (DECD) for a celebration of bat conservation at the Old New-Gate Prison and Copper Mine in East Granby on Saturday, September 10, 2022, from 11:00 a.m. to 3:00 p.m. This event will help raise awareness about the story of one of Connecticut’s most intriguing historical sites and its importance to the conservation of endangered species.

  • DEEP Reminds Visitors to State Parks this Weekend to Plan Ahead, Arrive Early, and Have a Back-up Plan

    (HARTFORD)—Ahead of the July 4th Weekend, the Connecticut Department of Energy and Environmental Protection (DEEP), the Connecticut State Police, and municipal leaders remind visitors to state parks and boat launches to plan ahead, arrive early, and have a back-up plan in mind in case the location of your choice is full and closed to new visitors upon arrival.

  • CT’s Latest Climate Report Shows Emissions in 2023 Decreased in the Two Largest Sources of Climate Pollution: Transportation and Buildings

    (HARTFORD) — The Connecticut Department of Energy and Environmental Protection (“DEEP”) published its latest Greenhouse Gas (“GHG”) Emissions Inventory, a comprehensive documentation of Connecticut’s air pollution that contributes to climate change. DEEP has issued this report since 2003, and also now in accordance with Public Act 25-125, signed into law by Governor Lamont earlier this month.

  • Governor Lamont Announces $7.5 Million in Grants Awarded to 18 Municipalities and Regional Organizations To Support Sustainable Waste Reduction

    (HARTFORD, CT) – Governor Ned Lamont and Connecticut Department of Energy and Environmental Protection (DEEP) Commissioner Katie Dykes today announced that the Lamont administration is awarding $7.5 million in grants to 18 municipalities and regional organizations under the second round of DEEP’s Sustainable Materials Management (SMM) Grant Program.

  • DEEP Announces Increased Incentive Levels For CHEAPR Program Effective October 1st

    (HARTFORD) — The Connecticut Department of Energy and Environmental Protection (DEEP) announced today that the standard incentive level for the popular Connecticut Hydrogen and Electric Vehicle Purchase Rebate (CHEAPR) program will be changing effective October 1, 2025. The CHEAPR program offers incentives to Connecticut residents who purchase or lease an eligible new or used battery electric (BEV) or plug-in hybrid electric (PHEV) vehicle from a licensed Connecticut automobile dealership or original equipment manufacturer.