Norwalk's Environmental Rules: The Rules That Matter

Every city handles environmental rules a little differently. In Norwalk, California, there are 4 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Flood Zones

Norwalk requires a development permit before any construction, grading, filling or manufactured-home placement within a FEMA-mapped special flood hazard area. The City Manager, serving as Floodplain Administrator under Chapter 15.48, reviews every application against the 2008 Flood Insurance Study and Rate Maps before work in the floodplain can proceed.

Key details: Governing chapter: Municipal Code Ch. 15.48. Permit required: Yes, for all development in flood hazard area. Administrator: City Manager as Floodplain Administrator. Violation classification: Misdemeanor. Governing maps: FIS/FIRM dated September 26, 2008.

Building or developing in a special flood hazard area without complying with Chapter 15.48 is a misdemeanor. Any structure or development lacking the required elevation certificate or other compliance documentation is presumed to be in violation until that paperwork is produced, shifting the burden to the property owner to prove compliance before the City will lift enforcement action.

Flood Elevation Requirements

New construction and substantially improved buildings inside Norwalk's mapped flood hazard area must have their lowest floor built at or above the base flood elevation shown on the City's Flood Insurance Rate Map. Non-residential buildings get one alternative: full dry floodproofing engineered to resist hydrostatic and hydrodynamic loads.

Key details: Residential standard: Lowest floor at/above base flood elevation. Non-residential option: Dry floodproofing to base flood level allowed. Manufactured homes: Elevated on permanent foundation or 36-inch piers. Data gap fallback: Administrator uses best available federal/state data. Variance insurance warning: Premiums may rise up to $25 per $100 coverage.

Building below the required base flood elevation without a granted variance triggers the Chapter 15.48 misdemeanor penalty and the presumption-of-violation rule in Section 15.48.040. A variance to build below base flood level is available only on the narrow terms of Section 15.48.160, and the City must warn the applicant in writing that construction below that elevation can raise flood insurance premiums by as much as $25 for every $100 of coverage.

Stormwater Management

Norwalk bans illicit connections and non-stormwater discharges into its municipal storm drain system under Chapter 18.04, from dumping yard waste in a catch basin to washing cars anywhere but a commercial car wash. The Director of Community Development enforces it as the city's MS4 permit compliance program.

Key details: Governing chapter: NMC Chapter 18.04 (Ord. 14-1651). Enforcing official: Director of Community Development. Permit program: LA County MS4 NPDES co-permittee. Car washing rule: Commercial wash or shutoff-nozzle hose only. Penalty: Up to $1,000 fine / 6 months jail, per day.

Violations are deemed a public nuisance abatable by the City, with costs billed to the property owner. The Director can issue cease-and-desist orders and notices to clean, and the City Attorney can pursue civil action for injunctions, investigation costs and damages. Per Section 18.04.110(E), violations are punishable under Chapter 1.16: up to a $1,000 fine, six months in jail, or both, with each day a separate offense.

Compared to other cities, Norwalk takes a harder line on stormwater management. The enforcement and penalty structure reflects that.

Erosion Control

Norwalk requires an approved erosion and sediment control plan before a discretionary permit issues for hillside grading or any project disturbing an acre or more of land. New single-family hillside homes must specifically protect slopes and channels and route runoff to vegetation before discharge.

Key details: Hillside trigger: Natural slope 25%+ with cut/fill grading. Project trigger: 1+ acre disturbed, 10,000+ sq ft impervious. State permit: GCASP required over 1 acre disturbed. Hillside home duty: Divert roof/surface runoff to vegetation. Permit gate: No discretionary permit until Director confirms compliance.

Failing to comply with an approved erosion/sediment mitigation plan, or with SUSMP requirements, is deemed a public nuisance under Section 18.04.110(A), abatable by the City with costs billed to the owner; false certification of BMP compliance is a separate violation. Enforcement can include civil injunctions, cost recovery and misdemeanor penalties under Chapter 1.16 of up to $1,000 and six months in jail, with each day a separate offense.

Compared to other cities, Norwalk takes a harder line on erosion control. The enforcement and penalty structure reflects that.

The Bottom Line

Norwalk is tougher than many cities when it comes to environmental rules. Out of the 4 rules covered here, 2 are rated strict. If you are a homeowner, renter, or business owner in Norwalk, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

These rules come from Norwalk's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.