Connecticut Public Act No. 25-33 (2025): An Act Concerning the Environment, Climate and Sustainable Municipal and State Planning […]

Connecticut Public Act No. 25-33, signed by the Governor on June 10, 2025, is a wide-reaching environmental and climate adaptation law that creates new standards and requirements for state and local government as well as the private sector. The Act establishes new obligations and frameworks across several different policy areas: flood risk disclosure, municipal and regional climate planning, local resilience financing, water and infrastructure climate proofing, and pesticide restrictions to protect pollinators and wildlife. 

The legislation affects a variety of stakeholders including insurance carriers, mortgage lenders, real estate sellers, municipalities, regional planning bodies, state agencies, and pesticide users. Many provisions contain phased effective dates ranging from passage through October 2027, giving affected parties time to build capacity and update internal processes. Specific portions of the Act are detailed separately by category in the summaries linked below.

  • Flood Risk Disclosure Requirements (Sections 1–4)
  • Resilience Planning and Zoning Requirements (Sections 5–16)
  • Tansfer of Development Rights (Sections 17–18)
  • Water Supply and Infrastructure Planning and Regulations (Sections 19–20)
  • Resiliency Improvement Districts (Sections 21–30)
  • Pesticide and Rodenticide Restrictions (Section 32)

Public Act No. 25-33 weaves climate risk considerations into the foundational instruments of land use planning, property disclosure, infrastructure financing, water regulation, and environmental protection. The Act creates a durable legal framework for climate resilience that operates at every level of government and across multiple sectors of the economy. A timeline for effective dates and implementation of the Act's requirements is included below.

Effective Date
Requirement
Obligated Party

Passage
  • Classify SGARs as restricted use (by Jan. 1, 2026)
  • Begin neonicotinoid restricted-use process

DEEP Commissioner

July 1, 2025
  • Expanded flood disclosure in property condition reports
  • RID framework in effect
  • Culvert/bridge mapping begins; POCD and regional plan updates
  • TDR framework updates

Municipalities, Sellers

Jan. 1, 2026
  • POCD adoption process updated (2/3 vote provision)

Municipal Planning Commissions

Oct. 1, 2025
  • Coastal site plan review expanded
  • Regional plans must address climate hazards

COGs, Zoning Commissions

July 1, 2026
  • Insurer flood notices required
  • Mortgage lender flood disclosure required

Insurers, Creditors

Oct. 1, 2027
  • Zoning regulations must address sea level change
  • Neonicotinoid use prohibition takes effect

Municipalities, Pesticide Users

Oct. 1, 2027
  • POCDs adopted after this date must include Climate Change Vulnerability Assessment

Municipal Planning Commissions

Oct. 1, 2028
  • State civil preparedness plan must incorporate climate hazard projections

DESPP

Dec. 31, 2028
  • Water supply and sewage disposal regulations updated for climate projections

DPH, DEEP, PURA

May 1, 2028
  • Municipalities submit culvert/bridge geospatial data to COGs

Municipalities

Publication Date: June 10, 2025

Related Organizations:

  • State of Connecticut

Related Resources:

Resource Category:

Resource Types:

  • Laws

States Affected:

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