How Chico Handles Environmental Rules: A Practical Guide

Chico maintains 96 local ordinances across all categories, and 5 of those deal specifically with environmental rules. Here is a breakdown of what the city actually requires, what is prohibited, and where Chico falls on the strict-to-permissive spectrum compared to other cities.

Erosion Control

Erosion control in Chico is enforced through the State Construction General Permit (Order 2022-0057-DWQ) for projects disturbing 1+ acre, the city's Phase II MS4 program for smaller sites, and California Building Code Appendix J for grading. SWPPPs and rainy-season BMPs are required to prevent sediment-laden runoff from entering the MS4 and creeks.

Key details: Construction General Permit trigger: 1 acre soil disturbance. Rainy season: October 1 through April 30. Required BMPs: Silt fence/fiber rolls, inlet protection, stabilized entrance, stockpile covers, concrete washout. Plan preparer: Qualified SWPPP Developer (QSD) for Risk Level 2 or 3 sites. Grading code: CBC Appendix J §J109 erosion control.

Discharging sediment into a creek or MS4 inlet is a Water Code §13385 violation with administrative civil liability up to $10,000/day plus $10/gallon. The city may issue stop-work orders and require BMP installation before work resumes.

Flood Zones

Chico participates in the National Flood Insurance Program (NFIP) and adopts FEMA Flood Insurance Rate Maps (FIRMs) for Butte County. Construction in Special Flood Hazard Areas (SFHAs — Zones A, AE, AO) along Big Chico Creek, Little Chico Creek, Lindo Channel, Mud Creek, and Sycamore Creek must comply with California Code of Regulations Title 23 Division 5 floodplain management standards.

Key details: Mapped flood sources: Big Chico Creek, Little Chico Creek, Lindo Channel, Mud Creek, Sycamore Creek. Freeboard: 1 foot above BFE for residential (CCR Title 23 §2905). Substantial improvement: Cumulative work ≥50% of pre-work market value. Floodway: No-rise certification required for any fill or structure. Look up flood zone: FEMA Map Service Center — msc.fema.gov.

Building or filling in a SFHA without a floodplain development permit is a code violation; NFIP non-compliance can result in community suspension and loss of federally backed flood insurance. Property owners face FEMA enforcement and increased Risk Rating 2.0 premiums.

Stormwater Management

Chico is enrolled in the State Water Board's statewide Phase II Small MS4 General Permit (Order WQ 2013-0001-DWQ, as amended). The city must prohibit non-stormwater discharges into the municipal storm-drain system and implement a six-program-element stormwater program (public education, illicit discharge detection and elimination, construction site runoff control, post-construction BMPs, and good housekeeping).

Key details: Permit: Statewide Phase II Small MS4 General Permit, Order WQ 2013-0001-DWQ (as amended). Construction trigger: 1 acre soil disturbance = Construction General Permit + SWPPP. Post-construction trigger: 5,000 sq ft new/replaced impervious surface. Allowed non-storm flows: Irrigation, residential car wash, dechlorinated pool water, firefighting. Report illicit discharge: Chico Public Works (530) 894-4200; State Water Board CalEPA spill line 1-800-852-7550.

Illicit discharges are enforced by the Central Valley Regional Water Quality Control Board with administrative civil liability up to $10,000 per day per Water Code §13385, plus city cleanup-cost recovery. Failure to file a Notice of Intent before grading 1+ acre is a Water Code violation.

Grading & Drainage

Grading in Chico is regulated under California Building Code Appendix J as adopted in Chico Municipal Code Title 16, plus engineering and drainage standards administered by Public Works. A grading permit is required for cuts exceeding 5 feet, fills exceeding 1 foot on slopes >5:1 or supporting structures, and any disturbance of 50 cubic yards or more (CBC App. J §J103).

Key details: Permit threshold: 50 cubic yards, or cuts >5 ft, or fills supporting structures (CBC App. J §J103). Max cut/fill slope: 2:1 (H:V) without geotechnical report. Foundation drainage: 2% slope away from foundation for 10 ft minimum. Engineered plans: Required for >50 cy or any SFHA work. Permit issuer: Chico Building Division (Title 16).

Unpermitted grading is a misdemeanor under CMC Title 16 with double-fee permit restoration and possible restoration order. Work creating drainage impacts on neighbors can trigger civil nuisance liability under Civil Code §3479.

Coastal Development

No local rule. Chico is an inland city in Butte County, roughly 100 miles from the Pacific coast, and is entirely outside the California Coastal Zone. The California Coastal Act (Public Resources Code §30000 et seq.) and Coastal Commission jurisdiction do not apply.

Key details: Coastal Zone status: Outside — Chico is ~100 miles inland. Coastal Act citation: Public Resources Code §30000 et seq. (not applicable). CDP required?: No. Local Coastal Program: None — not a coastal jurisdiction. Substitute frameworks: CMC Title 19 zoning, CCR Title 23 floodplain, riparian setbacks.

No applicable coastal-permit violations. Disputes over creek setbacks, riparian corridors, or floodplain development are handled under Chico Title 19 zoning and CCR Title 23 floodplain rules.

The rules around coastal development in Chico lean permissive, but that does not mean anything goes.

The Bottom Line

Chico's environmental rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Chico is broadly strict or permissive.

All of the above reflects Chico's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.