Industrial Noise: Gaithersburg vs Rockville
How do industrial noise rules compare between Gaithersburg, MD and Rockville, MD?
Gaithersburg and Rockville have similar restriction levels.
Gaithersburg, MD
Montgomery County
Gaithersburg limits industrial noise under Montgomery County Code Chapter 31B with specific decibel standards for industrial and commercial zones. The I-270 biotech corridor and research facilities must comply with noise limits at the boundary of adjacent residential zones.
View full Gaithersburg rules →Rockville, MD
Montgomery County
Industrial noise in Rockville is regulated under MoCo Code Chapter 31B. Industrial limits are 75 dBA day, 70 dBA night. Equipment running 24 hours must meet the nighttime standard.
View full Rockville rules →Key Facts Comparison
| Fact | Gaithersburg | Rockville |
|---|---|---|
| County Code | MoCo Ch 31B | - |
| Industrial Daytime | 70-75 dBA at boundary | - |
| At Residential Line | 55 dBA nighttime max | - |
| New Development | Noise impact assessment required | - |
| Industrial Day | - | 75 dBA maximum |
| Industrial Night | - | 70 dBA maximum |
| Commercial Day | - | 67 dBA maximum |
| Commercial Night | - | 62 dBA maximum |
| Enforcement | - | MoCo DEP |
Highlighted rows indicate differences between cities.
Gaithersburg FAQ
What are the noise limits for businesses in Gaithersburg?
Industrial zones may reach 70-75 dBA at their property boundaries during the day, but cannot exceed 55 dBA at any adjacent residential property line during nighttime hours under Montgomery County Code Chapter 31B.
Do new commercial buildings need noise studies?
Yes. New industrial and commercial developments undergo noise impact assessment during site plan review. Sound mitigation may be required as a condition of approval.
Rockville FAQ
What noise limits apply to businesses along the I-270 corridor?
Commercial properties must stay below 67 dBA daytime and 62 dBA nighttime at their property line. If an industrial or commercial property borders a residential zone, the stricter residential limits of 65/55 dBA apply.
Do HVAC systems need to meet noise standards?
Yes. All mechanical equipment including HVAC systems must comply with the applicable noise limits for the receiving property type. Equipment running 24 hours must meet the nighttime standard continuously.
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