Landscaping Rules in Costa Mesa, CA: What Residents Actually Need to Know

If you live in Costa Mesa or are thinking about moving there, landscaping rules are one of those things you probably won't think about until they affect you directly. Costa Mesa has 7 specific rules on the books covering different aspects of landscaping rules, and some of them might surprise you.

Artificial Turf

Costa Mesa allows artificial turf installation on residential properties as a water-saving landscaping alternative. Turf removal rebate programs may apply to transitioning from natural grass to synthetic turf. HOAs cannot unreasonably restrict artificial turf under California law.

Key details: Permit Required: Generally no for standard installs. HOA Restrictions: Limited by state law. Rebates: Check Mesa Water District. Drainage: Must maintain proper drainage. Development Services: (714) 754-5245.

Artificial turf installations creating drainage problems or violating setback requirements may receive code enforcement notices. HOAs that unreasonably prohibit artificial turf may face legal action under state law.

Costa Mesa is more permissive than most cities when it comes to artificial turf. That said, there are still limits.

Native Plants

Costa Mesa encourages native and drought-tolerant landscaping through compliance with California's Model Water Efficient Landscape Ordinance (MWELO). Rebates for turf replacement are available through Mesa Water District and Metropolitan Water District programs.

Key details: State Requirement: MWELO for projects 500+ sq ft. Turf Rebates: Mesa Water District programs. HOA Restrictions: Limited by Civil Code §4735. Climate Zone: Mediterranean — native species ideal. Plan Review: Development Services (714) 754-5245.

New projects failing to comply with MWELO requirements may have landscape plans rejected. HOAs unreasonably restricting drought-tolerant plants violate California Civil Code Section 4735.

Costa Mesa is more permissive than most cities when it comes to native plants. That said, there are still limits.

Rainwater Harvesting

California law encourages rainwater harvesting, and Costa Mesa permits residents to collect and store rainwater for irrigation and non-potable uses without a permit for systems under 5,000 gallons. Rebates may be available through Mesa Water District.

Key details: State Law: AB 1750 Rainwater Capture Act. No Permit Needed: Systems under 5,000 gallons. Use: Irrigation and non-potable only. Mosquito Prevention: Containers must be covered. Rebates: Check Mesa Water District.

Rainwater harvesting is legal and encouraged. However, systems creating mosquito breeding habitat or structural hazards may receive health or code enforcement notices. Large unpermitted systems may need retrofit.

Costa Mesa is more permissive than most cities when it comes to rainwater harvesting. That said, there are still limits.

Grass Height Limits

Costa Mesa property maintenance standards require owners to maintain landscaping and prevent overgrown vegetation. Weeds, debris, and unkempt vegetation constituting unsightly conditions or safety hazards must be removed.

Key details: Maintenance: Regular mowing and upkeep required. Specific Height: Not specified in inches. Nuisance Standard: Overgrown vegetation enforceable. Code Reference: CMMC Property Maintenance Standards.

Property maintenance violations result in Code Enforcement notices to correct. Continued non-compliance may lead to the city declaring the property a public nuisance and performing abatement at the owner's expense.

Weed Ordinances

Costa Mesa requires property owners to remove weeds, debris, and overgrown vegetation under property maintenance standards. The city may declare severely neglected properties a public nuisance and perform abatement at the owner's expense.

Key details: Requirement: Remove weeds, debris, overgrowth. Fire Code: Remove ignitable vegetation. Nuisance Declaration: For severe neglect. Abatement: City may perform at owner's cost.

Weed violations result in Code Enforcement notices. Non-compliance may lead to nuisance declaration, city abatement at the owner's expense, and liens on the property for unpaid costs.

Tree Trimming

Costa Mesa maintains city-owned street trees through the Public Works Department. Private trees on residential property are the owner's responsibility. Trees must not obstruct sidewalks, streets, or create hazardous conditions for neighbors.

Key details: City Trees: Maintained by Public Services. Private Trees: Owner's responsibility. Hazardous Trees: Owner must remove. Street Obstruction: Must be cleared by owner.

Unauthorized work on city trees may result in fines and restitution. Private tree failures causing hazards are the owner's liability. Code Enforcement addresses complaints about hazardous private trees.

Water Restrictions

Costa Mesa requires approved irrigation systems for new development under its landscaping standards. Automatically time-controlled sprinklers are required for commercial, industrial, and multi-family sites. Drought restrictions from the Mesa Water District apply.

Key details: Irrigation Required: For all landscaped areas. Auto Timers: Commercial/multi-family required. Water Provider: Mesa Water District. New Development: MWELO compliance required. Water Waste: Prohibited with fines.

New development failing to meet irrigation requirements may have permits withheld. Water waste during drought restrictions is subject to progressive fines from warnings to $500 per violation.

The Bottom Line

Compared to many U.S. cities, Costa Mesa gives residents more room on landscaping rules. 3 of the 7 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

This guide is based on Costa Mesa's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.