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
Heavy 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 erosion and sediment control on all construction sites over 1 acre per TCEQ CGP. Silt fence, rock construction entrance, and inlet protection mandatory. Inspections at key milestones and after half-inch rain events.
Environmental: Erosion Control
Heavy RestrictionsTCEQ Construction General Permit TXR150000 (2023)
TCEQ issued the renewal of the CGP with an effective date of March 5, 2023. Construction activities are regulated under the CGP if they discharge stormwater to any surface water in the state and disturb an acre or more of soil. Large construction activities which disturb 5 or more acres, or are part of a larger common plan of development or sale that will disturb 5 or more acres, are regulated ...
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
Heavy 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...
Grading & Drainage
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
Some 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...
Looking for Collin County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Allen city rules.
Environmental Rules in Collin County →