Environmental Rules in Denver, CO

If you live in Denver or are thinking about moving there, environmental rules are one of those things you probably won't think about until they affect you directly. Denver has 4 specific rules on the books covering different aspects of environmental rules, and some of them might surprise you.

Flood Elevation Requirements

Denver requires new and substantially improved residential structures in the flood storage area to elevate their lowest floor, including any basement, at least one and one-half feet above the base flood elevation.

Key details: Freeboard required: 1.5 ft above BFE. Critical facilities: 2 ft freeboard or dry floodproof. Proof required: FEMA Elevation Certificate. Enforcing agency: Denver floodplain administrator. Max civil penalty: $999 per day.

Failing to correct a floodplain violation draws a civil penalty of up to $999 per day under D.R.M.C. § 56-205, plus possible liens and injunctive action by the city.

Stormwater Management

Before Denver issues a building permit, developers must submit a detailed storm drainage plan to the manager of transportation and infrastructure showing how stormwater and groundwater will be drained, stored, or controlled on the site.

Key details: Plan required before: Building permit issuance. Enforcing agency: Manager of Transportation & Infrastructure. Service charge basis: Impervious surface, per 100 sq ft. Nonpayment penalty: Property lien, collected like taxes.

No building permit issues until the storm drainage plan is approved; unpaid storm drainage service charges become a lien on the property, certified to the manager of finance and collected the same way as delinquent real property taxes.

Flood Zones

Denver requires new construction and substantial improvements inside its regulatory floodplain to elevate the lowest floor at least 1.5 feet above the base flood elevation, and bars any building meant for human occupancy from the floodway entirely.

Key details: Freeboard requirement: 1.5 ft above base flood elevation. Floodway occupancy: human-occupancy buildings banned. Enforcing office: floodplain administrator (DOTI). Civil penalty: up to $999 per day. Manufactured homes: barred from the floodplain.

Failing a manager's order to correct a floodplain violation carries a civil penalty of up to $999 per day for each day the violation continues, plus potential liens and injunctive action to force compliance.

Compared to other cities, Denver takes a harder line on flood zones. The enforcement and penalty structure reflects that.

Erosion Control

Denver caps how much you can re-grade a lot near the street or side yard: no more than a 1-foot difference between original and finished grade within 10 feet of the primary street lot line.

Key details: Grade-change limit: 1 foot, original to finished grade. Applies within: 10 ft of primary street lot line. Also covers: required side interior setbacks. Exceeding the limit: needs Zoning Administrator exception approval. Exempt lots: single-owner/master-developer Face Blocks.

Grading beyond the 1-foot limit without an approved exception is a Zoning Code violation; Community Planning and Development can issue a stop-work order until the site is brought into compliance or an exception is obtained.

The Bottom Line

Denver'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 Denver is broadly strict or permissive.

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