Exterior noise in Altadena's residential zones is capped at 50 dBA daytime / 45 dBA nighttime (single-family); 55/50 dBA (multi-family); 60/55 dBA commercial; 70 dBA all hours industrial.
LA County Code Section 12.08.390 and Part 3 (Community Noise Criteria) set numeric exterior noise standards measured at the property line. Daytime is 7 a.m.–10 p.m., nighttime 10 p.m.–7 a.m. The standards apply to L50 (sound level exceeded 50% of any hour), with higher caps for shorter durations (L25, L8.3, L1.7, Lmax). Per 12.08.380, no source may exceed the ambient by more than 5 dB.
Citable as an infraction under Section 12.08.560. Administrative fines under Chapter 1.25.
Altadena, CA
LA County allows backyard chickens in R-1 zones in unincorporated areas (including Altadena) subject to coop setbacks under LA County Code Title 10 and Title...
Altadena, CA
LA County Code Section 10.32.010 prohibits dogs running at large in any public place or private property other than the owner's, unless restrained by a chain...
Altadena, CA
Trimming protected oak trees (≥8 in DBH) requires an Oak Tree Permit if the work enters the protected zone or removes >25% of crown. Street trees in the publ...
Altadena, CA
In Altadena's Very High Fire Hazard Severity Zones, grass and weeds must be kept under 3 inches under LA County Fire Code Title 32 defensible-space rules.
Altadena, CA
LA County Fire's Brush Clearance program also functions as the weed-abatement ordinance — vacant and improved lots must keep weeds and grasses cut to under 3...
Altadena, CA
Outdoor watering in Altadena (served by Lincoln Avenue Water Co., Las Flores Water Co., Rubio Cañon, and Kinneloa Irrigation District) is limited to 2 days p...
Side-by-side rule comparisons with other cities in Los Angeles County.
See how other cities in Los Angeles County handle decibel limits.
See how Altadena's decibel limits rules stack up against other locations.
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