Industrial Noise: Honolulu vs Waipahu
How do industrial noise rules compare between Honolulu, HI and Waipahu, HI?
Honolulu and Waipahu have similar restriction levels.
Honolulu, HI
Honolulu County
Stationary-source industrial noise on Oahu is capped primarily by state rule HAR 11-46 with local backup from Honolulu's noise control article.
View full Honolulu rules →Waipahu, HI
Honolulu County
Waipahu commercial and industrial noise sources follow ROH Chapter 41 Article 6 and state HAR 11-46 dBA limits, protecting the CDP's dense residential blocks.
View full Waipahu rules →Key Facts Comparison
| Fact | Honolulu | Waipahu |
|---|---|---|
| City Code | ROH §§41-6.1–41-6.5 | - |
| State dBA Limits | HAR 11-46 | - |
| Enforcers | HPD, DOH | - |
| Coverage | All Oahu zones | - |
| Code Section | - | ROH Section 41-6 |
| State Rule | - | HAR 11-46 |
| Residential Class | - | Class A strictest |
| Joint Enforcement | - | DOH and HPD |
Highlighted rows indicate differences between cities.
Honolulu FAQ
Where are the decibel numbers for factories?
Zoning-based maximum permissible sound levels for stationary sources appear in state rule HAR 11-46, not directly in the Revised Ordinances of Honolulu.
Can the City cite an industrial facility?
Yes. Honolulu police and inspectors can cite under ROH Chapter 41 Article 6 in addition to state enforcement under HAR 11-46.
Waipahu FAQ
What about refrigeration units at Waipahu markets?
Commercial refrigeration and HVAC equipment near Waipahu homes must meet HAR 11-46 dBA limits at the residential property line. DOH can order acoustic shielding when limits are exceeded.
Are small warehouses covered?
Yes. Light-industrial operations along Farrington Highway must meet HAR 11-46 dBA limits wherever their noise reaches adjacent Waipahu residential zones, regardless of business size.
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