How McKinney Handles Environmental Rules: A Practical Guide
McKinney maintains 65 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 McKinney falls on the strict-to-permissive spectrum compared to other cities.
Flood Elevation Requirements
In McKinney's mapped floodplain, new homes and substantially improved homes must have their lowest floor at least two feet above the base flood or fully developed 100-year flood elevation, whichever is higher: a full two feet of freeboard enforced by the city Engineering Department.
Key details: Residential freeboard: 2 ft above base flood elevation. Pad elevation: At least 1 ft above flood. Non-residential option: Elevate 2 ft or floodproof watertight. Floodplain basis: FEMA FIRM dated June 7, 2017. Enforcement: City Engineering Department / Director.
Building or substantially improving a floodplain structure below the two-foot elevation, or floodproofing that fails engineer certification, violates UDC §705; the Director of Engineering withholds plat and permit approval until lowest-floor and pad elevations comply.
Erosion Control
McKinney requires erosion and sediment control BMPs on all construction sites disturbing 1 acre or more. Silt fences, inlet protection, stabilized construction entrances, and perimeter controls must be installed before earthwork begins and maintained through final stabilization.
Key details: Trigger: 1 acre disturbance. Standards: NCTCOG iSWM. Stabilization: 14 days inactive. BMPs: Silt fence, inlets. Fine: 500-2,000 per day.
Stop-work orders plus 500-2,000 dollars per day per Chapter 1 general penalty. TCEQ may pursue state enforcement.
McKinney is more permissive than most cities when it comes to erosion control. That said, there are still limits.
Stormwater Management
McKinney operates under a TCEQ MS4 Phase II stormwater permit (TXR040000). Development over 1 acre must submit a Stormwater Pollution Prevention Plan (SWPPP) and file a Notice of Intent with TCEQ. Illicit discharges to storm drains are prohibited.
Key details: MS4 Permit: TXR040000. SWPPP Trigger: 1 acre. NOI: TCEQ filing. Illicit Discharge: 2,000 dollars per day. Only Allowed: Rainwater.
Illicit discharge fines up to 2,000 dollars per day. SWPPP non-compliance: stop-work order plus TCEQ referral.
McKinney is more permissive than most cities when it comes to stormwater management. That said, there are still limits.
Flood Zones
McKinney participates in the NFIP (CID 480134). Properties along the East Fork Trinity River, Wilson Creek, and Honey Creek include mapped SFHA Zones AE and A. Substantial improvement or substantial damage (50 percent rule) triggers full floodplain compliance per Chapter 38 Flood Damage Prevention.
Key details: NFIP CID: 480134. Rivers: East Fork Trinity, Wilson Creek. Freeboard: 2 ft above BFE. 50 Percent Rule: Substantial improvement. FIRM Effective: June 2, 2009.
Non-compliant construction: stop-work plus 2,000 dollars per day. FEMA may suspend city from NFIP for systemic violations.
McKinney is more permissive than most cities when it comes to flood zones. That said, there are still limits.
The Bottom Line
Compared to many U.S. cities, McKinney gives residents more room on environmental rules. 3 of the 4 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.
All of the above reflects McKinney's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.