Quiet hours in Hawaii County, HI — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Hawaii County has no separate city curfew because the county is the only local government. Statewide DOH rules (HAR 11-46) drop the nighttime noise limit to 45 dBA in residential (Class A) areas from 10 p.m. to 7 a.m.
Noise is regulated island-wide under the State Department of Health's Community Noise Control rules (HAR Chapter 11-46), enforced under HRS Chapter 342F, rather than by any city ordinance. The rules set a lower nighttime sound ceiling: in Class A zones (residential, conservation, open space) sound may not exceed 45 dBA from 10:00 p.m. to 7:00 a.m., versus 55 dBA in the daytime. Class B (apartment, business, hotel, resort) drops to 50 dBA at night; Class C (agriculture, industrial) stays 70 dBA. Exceeding the limit for more than 10% of any 20-minute period is a violation unless you hold a DOH permit or variance.
DOH enforces; HAR 11-46 provides fines up to $10,000 per offense, with each day a separate offense. Call the DOH complaint line or police for after-hours disturbances.
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