Addition of dBC Noise Limits
What it is: We’ve added dBC noise measurement limits to our ordinance to better capture and measure low-frequency sounds. (See additions on Table 1 below)
Why it matters: Unlike standard dBA measurements, which primarily detect mid-range sounds like speech and traffic, dBC measurements capture deeper, low-frequency noises such as bass from music or heavy machinery. These sounds can travel farther and penetrate walls, making them more disruptive in residential areas. Adding dBC limits ensures that noise enforcement addresses all types of sound, improving fairness and effectiveness.
Understanding Sound Measurements: dBA vs. dBC
| Aspect |
dBA |
dBC |
| Frequency Focus |
Weighs sounds humans hear best, de-emphasizing lows and highs. |
Captures more low and high frequencies. |
| Use Cases |
Everyday noise like conversations and traffic. |
Low-frequency noise like concerts or machinery. |
| Perceived Impact |
Less sensitive to bass. |
Includes bass and other low frequencies. |
Table I: Maximum Permissible Sound Level Limits dBA and dBC
| Use |
Times |
Outdoor |
Indoor |
| Residential |
7:00 a.m. to 10:00p.m.
10:00 p.m. to 7:00a.m. |
60 dBA 70 dBC
50 dBA 60 dBC |
45 dBA 55 dBC
35 dBA 45 dBC
|
| Commercial |
24 hours |
65 dBA 75 dBC |
55 dBA 65 dBC |
| Industrial |
24 hours |
75 dBA 85 dBC |
65 dBA 75 dBC |
If the residential use is within a commercial, industrial, or mixed use, or within two hundred (200) feet of such use, the outdoor sound level limit is 65 dBA or 75 dBC between 7:00 a.m. to 10:00 p.m.
Proactive Noise Measurement Guidelines
What it is: Noise measurements will now be taken 5 feet from the building, structure, or establishment, ensuring a clear, consistent standard for enforcement.
Why it matters: Setting a specific measurement point helps standardize how noise is evaluated, ensuring accurate and effective enforcement. This approach provides clarity for property owners and businesses by defining exactly where noise levels will be assessed, reducing disputes and improving compliance.
Complaint-Initiated Measurements in Special Entertainment Districts
What it is: Noise complaints will be assessed from the property line of the complainant, in addition to measurements taken at the noise source (such as the venue).
Why it matters: Adding the ability to measure noise from the complainant's property line gives code officers two perspectives for assessing noise issues. This approach allows for more accurate evaluations, ensuring effective enforcement and better addressing community concerns in Special Entertainment Districts.
Standards for Non-Amplified Noise in Residential Areas
What it is: The ordinance now includes rules for managing non-amplified noise from residential properties, such as loud conversations, shouting, or other disruptive sounds.
Why it matters: Establishing clear standards for non-amplified noise enables code officers to address disturbances effectively and issue violations when necessary.