Environmental Rules in Lewisville, TX (2026)
4 verified environmental rules for Lewisville, Texas, sourced directly from the municipal code and official government pages.
Verified from official government sources
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.
Lewisville Stormwater Discharge Regulations
Some RestrictionsLewisville City Code § 16-375
No person shall introduce or cause to be introduced, into the MS4, any harmful quantity of sediment, silt, earth, soil or other material associated with clearing, grading, excavation, or any other construction activities, in excess of what could be retained onsite or captured by employing erosion and sediment control measures to the maximum extent practicable. ... No person shall discharge wast...
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.
Lewisville Right-of-Way Erosion Control Rules
Some RestrictionsLewisville City Code § 13-40(c)
Erosion control measures (e.g., silt fence) and advance warning signs, markers, cones, and barricades must be in place before work begins. Owner shall be responsible for stormwater management, erosion control, and excavation safety measures that comply with city, state, and federal guidelines. Requirements shall include, but not be limited to, construction fencing around any excavation that wil...
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.
Lewisville Floodplain Development Permit Rules
Some RestrictionsLewisville, TX Code of Ordinances §§ 5.5-5, 5.5-7, 5.5-8
This chapter shall apply to all areas of special flood hazard with the jurisdiction of the city. ... A floodplain development permit shall be required to ensure conformance with the provisions of this chapter. ... No structure or land shall hereafter be located, altered, or have its use changed without full compliance with the terms of this chapter and other applicable regulations.
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.
Lewisville 2-Foot Freeboard Elevation Rule
Some RestrictionsLewisville, TX Code of Ordinances § 5.5-17
(1)Residential construction. New construction and substantial improvement of any residential structure shall have the lowest floor (including basement and all machinery and equipment servicing the building), elevated to two feet above the base flood elevation. A registered professional engineer, architect, or land surveyor shall submit a certification to the floodplain administrator that the st...
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County ordinances apply to unincorporated areas and may supplement Lewisville city rules.
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