Connecticut Statewide Rule

Connecticut Industrial Noise Limits Set by State DEEP

Some RestrictionsApplies statewide across Connecticut (2026)

Key Facts

Statute: CGS Chapter 442
Industrial day limit: 70 dBA to residential
Industrial night limit: 61 dBA to residential
Local floor: At least as stringent
Civil penalty: Up to $1,000 daily

Last verified: September 5, 2026Source: State of Connecticut

Summary

Connecticut Chapter 442 and DEEP Regulations Section 22a-69 establish statewide decibel limits for industrial, commercial, and residential noise emitters. Municipal noise ordinances must be at least as stringent as the state plan and cannot weaken these standards.

(c) Any such municipal noise control ordinance shall be at least as stringent as any state noise control plan, including ambient noise standards, adopted pursuant to section 22a-69 or any standards or regulations adopted by the administrator of the United States Environmental Protection Agency pursuant to the Noise Control Act of 1972 (P.L. 92-574) or any amendment thereto. Notwithstanding the provisions of this subsection, any municipality may adopt more stringent noise standards than those adopted by the commissioner.

Source: State of ConnecticutView official code

Full Breakdown

Under CGS Sections 22a-67 through 22a-76, Connecticut DEEP adopted noise control regulations setting maximum sound levels measured at the receiving property line by zone classification. Class C (industrial) emitters generally cannot exceed 70 dBA into Class A (residential) areas during daytime, dropping to 61 dBA at night, with similar tiered limits for commercial-to-residential and industrial-to-commercial transmissions. CGS Section 22a-73 requires any municipal noise control ordinance to be at least as stringent as the state plan. As of July 1, 2022, municipalities no longer need DEEP approval for local ordinances, but the substantive floor remains. Enforcement is primarily local, but DEEP retains authority over major emitters.

Violations & Penalties

Civil penalties up to $1,000 per day per violation under CGS Section 22a-76; emergency orders and injunctive relief available; municipalities may enforce stricter penalties via local ordinance.

Frequently Asked Questions

Can a Connecticut town allow louder industrial noise than the state limit?

No. CGS Section 22a-73 requires municipal noise ordinances to be at least as stringent as the state plan. Cities may impose tighter limits but cannot lower the state-mandated decibel ceilings.

How is industrial noise measured under Connecticut law?

Sound levels are measured in A-weighted decibels at the property line of the receiving land, using a standard sound level meter, comparing to the zone classification of both emitter and receiver.

Sources

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