La Mesa, CA Noise Ordinances: Decibel Limits (2026)
Key Facts
- R1/R2 nighttime limit
- 50 dB, 10 p.m. to 7 a.m.
- R3/RB nighttime limit
- 55 dB, 10 p.m. to 7 a.m.
- Commercial daytime limit
- 65 dB, 7 a.m. to 10 p.m.
- Manufacturing (M) zone limit
- 70 dB at any hour
- Measurement standard
- A-weighted sound level meter, Section 10.80.030
- Enforcing agency
- La Mesa Police Department
Summary
La Mesa Municipal Code Section 10.80.040 sets maximum ambient sound levels by zone and time of day: 50 decibels overnight in R1 and R2 residential zones, rising to 70 decibels at any hour in manufacturing (M) zones. Whichever is lower, the true ambient level or the zone table, governs, measured at the property line closest to the noise source.
Where the ambient noise level is less than designated in this section, the respective noise level in this section shall govern. The noise level to be observed in all measurements shall be that specified for the zone applicable to the property adjoining that on which the noise is generated and closest to the noise source.
Sound Level A, Decibels
Zone Time Level R1 & R2 10:00 p.m. to 7:00 a.m. 50 R1 & R2 7:00 p.m. to 10:00 p.m. 55 R1 & R2 7:00 a.m. to 7:00 p.m. 60 R3 & RB 10:00 p.m. to 7:00 a.m. 55 R3 & RB 7:00 a.m. to 10:00 p.m. 60 C, CN, CD & CM 10:00 p.m. to 7:00 a.m. 60 C, CN, CD & CM 7:00 a.m. to 10:00 p.m. 65 M Anytime 70
Full Breakdown
Section 10.80.040 fixes the citywide ambient base noise level table that anchors every other noise provision in Chapter 10.80. For R1 and R2 single-family residential zones the limit is 50 decibels from 10:00 p.m. to 7:00 a.m., 55 decibels from 7:00 p.m. to 10:00 p.m., and 60 decibels from 7:00 a.m. to 7:00 p.m. R3 and RB multi-family zones are allowed 55 decibels overnight, from 10:00 p.m. to 7:00 a.m., and 60 decibels during the day, from 7:00 a.m. to 10:00 p.m. Commercial zones C, CN, CD and CM are capped at 60 decibels overnight and 65 decibels during the day, and manufacturing (M) zoned property is capped at 70 decibels at any hour.
Section 10.80.030 requires that any sound-level measurement use a sound level meter with A weighting, and Section 10.80.040 itself directs that the level be measured at the zone applicable to the property adjoining the one generating the noise, closest to the source; where the true ambient level is already lower than the table, that lower ambient figure governs instead. This table is the reference standard cross-referenced throughout the rest of the chapter, including the machinery and air-conditioning allowance in Section 10.80.090, which permits five decibels over ambient, and the landscaping equipment rule in Section 10.80.101.
A violation is enforced by the La Mesa Police Department as an infraction under the general penalty clause, Section 1.01.080, and Section 10.80.060 additionally allows the city to seek an injunction or restraining order against a continuing violation as a public nuisance.
Violations & Fines
Exceeding the Section 10.80.040 table is an infraction under Section 1.01.080, punishable by a fine of up to $250, with each day of a continuing violation treated as a separate offense. Section 10.80.060 also lets the city pursue a court injunction or restraining order against a device or activity causing repeated excess noise, as an additional civil remedy available to the city.
Frequently Asked Questions
What is the nighttime noise limit in a La Mesa residential neighborhood?
Are commercial zones in La Mesa allowed louder noise than residential zones?
Where is noise measured to check compliance with La Mesa's decibel table?
Sources & Official References
Other rules in La Mesa
California rules heatmap·Compare La Mesa to another location·View the California noise ordinances overview
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