How Lewisville Handles Environmental Rules: A Practical Guide

Lewisville maintains 90 local ordinances across all categories, and 4 of those deal specifically with environmental rules. Here is a breakdown of what the city actually requires, what is prohibited, and where Lewisville falls on the strict-to-permissive spectrum compared to other cities.

Erosion Control

Contractors working in a Lewisville public right-of-way must have erosion control measures, such as silt fencing, in place before construction begins under Section 13-40(c), and the owner stays responsible for stormwater management and excavation safety for the life of the project.

Key details: Erosion controls required: Silt fence, barricades before work starts. High-erosion standard: Wire-backed silt fencing required. Backfill compaction: 95% standard proctor density. Scope: Right-of-way excavation/installation work. Cross-referenced rule: City stormwater pollution prevention ordinance.

Failing to install erosion control before work begins, or letting silt fencing or barricades lapse during construction, is a violation of the Section 13-40 permit conditions; the responsible person can halt work, require additional restoration under Section 13-49, and bill the owner for any city cleanup, on top of prosecution under the Code's general penalty in Section 1-15.

Stormwater Management

Lewisville bans dumping anything but stormwater into its storm drain system (the MS4) and requires construction sites to file a stormwater pollution prevention plan before breaking ground. Violations are Class C misdemeanors carrying fines up to $2,000 per day under City Code Article VIII.

Key details: Governing chapter: City Code Ch. 16, Art. VIII. Max fine per violation: $2,000.00, each day separate. Min fine: $100.00. SWPPP inspection interval: Every 14 days minimum. Deficiency repair window: 7 calendar days.

A person who intentionally, knowingly, recklessly, or negligently violates Article VIII commits a Class C misdemeanor punishable by a fine of $100 to $2,000, with each day of continued violation a separate offense under Section 16-394. Violators are also liable to the city for any expense, loss, or damage the violation causes, plus the city's attorney's fees, court costs, and litigation expenses, and the control authority can pursue civil and criminal remedies under the Texas Water Code. Courts must set fines no lower than the economic benefit the violator gained from noncompliance.

Flood Elevation Requirements

Any new home or substantial improvement in a Lewisville special flood hazard area must have its lowest floor built two feet above the base flood elevation, not just at flood level. Commercial and industrial buildings get the same two-foot freeboard unless they are engineered watertight below that line.

Key details: Freeboard: 2 feet above base flood elevation. Applies to: Residential and nonresidential structures. Certification: Required from PE, architect, or surveyor. Enclosures: 1 sq in vent per sq ft, ≤1 ft above grade. Also covers: Manufactured homes and RVs.

Building below the required two-foot freeboard without the engineer's or architect's certification violates section 5.5-17, and any construction undertaken without a floodplain development permit and without complying with the chapter's elevation standards is unlawful under section 5.5-21. Violations carry the city's general Code penalty under section 1-15, up to $2,000 for offenses tied to public health and sanitation or $500 for other violations, with each day counted separately.

Flood Zones

Lewisville requires a floodplain development permit for any construction, fill, or land alteration within the city's mapped areas of special flood hazard under Code of Ordinances Chapter 5.5. The city-appointed floodplain administrator reviews every application against FEMA's Flood Insurance Rate Maps for Denton and Dallas counties before work can begin.

Key details: Permit: Required before any special-flood-hazard construction. Administrator: City manager or designee (§ 5.5-12). Flood maps: FIRM: 4/18/2011 Denton, 7/7/2014 Dallas. Appeals: City appeal board, then courts (§ 5.5-15). Penalty: Up to $500-$2,000 per day, § 1-15.

It is unlawful to construct, locate, extend, convert, or alter a structure or land in a special flood hazard area without full compliance with Chapter 5.5 (§ 5.5-21). Because the chapter does not set its own fine, violations fall under the city's general penalty, § 1-15, which authorizes fines up to $2,000 for offenses tied to public health and sanitation and up to $500 for other Code violations, with each day of continued noncompliance a separate offense.

The Bottom Line

Lewisville'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 Lewisville is broadly strict or permissive.

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