Proposed State Implementation Plan SIP Revisions

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

Proposed State Implementation Plan (SIP) Revisions

The public notices in this section are provided as a convenience to the public. The official legal notice has been published in accordance with the requirements of all applicable laws.

When available, supporting documents (draft permits, etc.) are formatted as Adobe PDF files and can be read online or downloaded for printing.

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Note: Notices of Proposed Regulations can be viewed on the Connecticut eRegulations website.

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Notice of Intent to Revise the State Implementation Plan for Air Quality: Attainment Demonstration for the 2008 Ozone NAAQS Contingency Measures and Motor Vehicle Emissions Budgets

(Originally posted on 12/31/2025) Notice of Intent to Revise the SIP for Air Quality: Attainment Demonstration for the 2008 Ozone NAAQS Contingency Measures and Motor Vehicle Emissions Budgets. A public online hearing, only upon request, will be held at 2:00 PM on February 24, 2026. Such a request must be made by 4:00 PM on February 18, 2026. If no request for a hearing is received on or before February 18, 2026, the hearing will be cancelled. Written comments are due by February 24, 2026.

Date Posted: 1/13/2026

Connecticut Department of Energy & Environmental Protection

Proposed State Implementation Plan (SIP) Revisions