All grading and disturbed sites in Altadena must implement erosion controls under LA County Building Code Title 26 Appendix J and the County's MS4 permit. Rainy-season grading (Oct 15 – Apr 15) requires Best Management Practices approved by Public Works.
LA County Title 26 Appendix J (Grading) and the LA County MS4 NPDES permit require erosion and sediment control on any site with disturbed soil. Practices include silt fences, fiber rolls, stabilized construction entrances, hydroseeding, and covering soil stockpiles. Altadena CSD 22.306.060.B.3.b further requires rainy-season grading to comply with Public Works' erosion-control directives. Post-Eaton Fire (Jan 2025) burn-scar properties require additional debris-flow protections such as K-rails and concrete debris basins.
Erosion-control failures during the rainy season can result in stop-work orders, daily fines under Title 12, and citations from the LA Regional Water Quality Control Board.
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 erosion control.
See how Altadena's erosion control rules stack up against other locations.
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