Noise from Specific Sources in Hillsboro, OR: What Residents Actually Need to Know
If you live in Hillsboro or are thinking about moving there, noise from specific sources are one of those things you probably won't think about until they affect you directly. Hillsboro has 3 specific rules on the books covering different aspects of noise from specific sources, and some of them might surprise you.
Car Alarm Limits
Hillsboro's noise ordinance exempts bona fide alarm systems, including vehicle alarms, from the city's decibel limits, so a car alarm sounding as genuine theft protection isn't a code violation on its own.
Key details: Governing section: HMC 6.24.050(C). Exempt: bona fide alarm system sounds. Base noise limit: 50-70 dBA by zone. Chronic false alarms: handled as nuisance, HMC 6.28.
No citation issues for a car alarm sounding as bona fide theft protection; a chronic false or malfunctioning alarm can instead be pursued as a public nuisance under HMC Chapter 6.28.
The rules around car alarm limits in Hillsboro lean permissive, but that does not mean anything goes.
Delivery Truck Noise
Hillsboro's noise ordinance exempts sounds caused by regular vehicular traffic on premises open to the public, so ordinary delivery truck activity, engines, backup alarms, loading, is not a citable noise violation.
Key details: Governs: HMC § 6.24.050(G). Status: Exempt, not regulated. Covers: Regular vehicular traffic. Location: Premises open to public.
None: regular vehicular traffic on premises open to the public is exempt from HMC 6.24's noise limits, so ordinary delivery-truck noise cannot be cited under this ordinance.
If you are coming from a city with tighter rules, you will find Hillsboro gives residents more flexibility on delivery truck noise.
HVAC & Mechanical Noise
Hillsboro caps noise from air conditioners, heat pumps and other mechanical equipment under its general sound ordinance: 60 dBA in daytime hours and 50 dBA overnight, measured at the property line closest to the source.
Key details: Night limit: 50 dBA, 9 p.m.-6 a.m.. Day limit: 60 dBA, 6 a.m.-9 p.m.. Measured at: property line nearest the source. Governing law: HMC § 6.24.030, Table 6.24.030-A.
Exceeding 50 dBA at night or 60 dBA by day at the property line violates HMC 6.24.030; each day of continued excess noise is a separate enforceable offense.
The Bottom Line
Compared to many U.S. cities, Hillsboro gives residents more room on noise from specific sources. 2 of the 3 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.
These rules come from Hillsboro's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.