Environmental Rules in Allen, TX (2026)
4 verified environmental rules for Allen, Texas, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Allen operates under TCEQ MS4 Phase II permit (TXR040000). New development over 1 acre requires SWPPP, detention pond, and water quality BMPs. No discharge of pollutants to storm drains - only rain goes down the drain.
Environmental: Stormwater
Light RestrictionsTCEQ - Texas Pollutant Discharge Elimination System (TPDES) Stormwater Program
TPDES Stormwater Construction General Permit, TXR150000, which expires on March 5, 2028. The TCEQ will hold a stakeholder meeting for the renewal of the CGP on June 9, 2026, from 1:30-4:00 pm. Preliminary proposed changes to the general permit will be discussed in a presentation, and input from stakeholders will be gathered during and following this meeting.">The TCEQ has begun the process for ...
Erosion Control
Allen requires grading permits for any lot alteration moving over 50 cubic yards of soil. Positive drainage away from structures mandatory - minimum 5% slope for 10 feet. No redirecting water onto adjacent properties.
Environmental: Grading Drainage
Light RestrictionsTex. Local Government Code Sec. 232.003 (Subdivision Requirements)
Sec. 232.003. SUBDIVISION REQUIREMENTS. By an order adopted and entered in the minutes of the commissioners court, and after a notice is published in a newspaper of general circulation in the county, the commissioners court may:(1) require a right-of-way on a street or road that functions as a main artery in a subdivision, of a width of not less than 50 feet or more than 100 feet;(2) requir...
Flood Zones
Allen participates in NFIP and has floodplains along Rowlett Creek and East Fork Trinity River tributaries. FEMA Zone AE requires BFE plus 2 feet finished floor elevation. No habitable structures in floodway. CRS Class 7 for 15% premium discount.
Environmental: Flood Zones
Some RestrictionsFEMA Flood Map Service Center - National Flood Insurance Program
The FEMA Flood Map Service Center (MSC) is the official public source for flood hazard information produced in support of the National Flood Insurance Program (NFIP). Use the MSC to find your official flood map, access a range of other flood hazard products, and take advantage of tools for better understanding flood risk. FEMA flood maps are continually updated through a variety of processes. E...
Flood Elevation Requirements
In Allen's FEMA special flood hazard areas, new and substantially improved homes must have their lowest floor elevated 24 inches above the base flood elevation; nonresidential buildings get 18 inches. The Director of Engineering enforces it through a required development permit.
Allen, Texas Floodplain: Lowest Floor 24 Inches Above BFE
Some RestrictionsLand Development Code § 5.01.7.2(a), (c)
Residential construction (at grade). New construction and substantial improvement of any residential structure shall have the lowest adjacent grade or lowest floor (including the basement), which ever value is lower to 24 inches above the base flood elevation... Nonresidential construction. New construction and substantial improvements of any commercial, industrial or other nonresidential struc...
Looking for Collin County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Allen city rules.
Environmental Rules in Collin County →