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Environmental Rules in Collin County, TX (2026)

2 county-level rules, plus city-specific rules for 4 cities in Collin County, Texas.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Collin County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Erosion Control

Grading and drainage work over 1 acre requires a Collin County or city engineering permit plus TCEQ CGP. Sites must drain positively away from foundations with 6-inch fall in first 10 feet.

Environmental: Grading Drainage

Light Restrictions

Tex. Local Government Code Sec. 232.003 (County Subdivision Requirements - Drainage)

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

Collin County participates in NFIP with floodplain management ordinances. Lake Lavon and Lake Ray Hubbard drive FEMA Zone AE and shaded X designations. New construction in SFHA must elevate 1-2 ft above BFE.

Environmental: Flood Zones

Light Restrictions

FEMA Flood Map Service Center — About Flood Map Service Center

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...

Environmental Rules by City in Collin County

4 cities in Collin County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.

All Collin County ordinances

See every category we cover for Collin County: parking, noise, fences, fires, animals, pools, and more.

Collin County Ordinance Hub →