Grayson County, TX SWPPP & Stormwater Requirements
Updated August 2026
Grayson County splits cleanly in two for stormwater: three cities run their own programs, and everywhere else the state permit is the whole rulebook.
Who regulates construction stormwater in Grayson County?
Three Grayson County cities held active TCEQ small MS4 authorizations when checked on August 9, 2026: Sherman, Denison, and Pottsboro. Each of those cities reviews construction against its own requirements, and each has its own guide: Sherman, Denison, and Pottsboro.
What the county itself requires
The county's own posture is specific, and worth reading before assuming there is no local layer at all. Grayson County's own small-MS4 waiver coverage ended February 11, 2025, and a statewide search of TCEQ's stormwater permit database on August 9, 2026 returned no permit records for Grayson County. What the county does run is a land-use layer. Grayson County's subdivision regulations require plats to carry language stating that the county will not be responsible for the maintenance and operation of drainage ways or the control of erosion. That disclaimer is the tell: drainage design gets reviewed at platting, but erosion control is the operator's problem, start to finish. Under Grayson County's flood damage prevention order, no structure or land may be constructed, located, extended, converted, or altered without full compliance with that order and other applicable regulations.
The towns without programs
Gunter, Van Alstyne, Whitesboro, Dorchester, and Gordonville each returned no TCEQ stormwater permit records in a statewide search on August 9, 2026. Gordonville does not appear in the U.S. Census Bureau's 2024 gazetteer of Texas places — it is an unincorporated community rather than an incorporated city. A town without a city program is not a town without rules — the state permit still applies in full, and the difference is that no local office is checking behind you. On those jobs the state permit is not the floor — it is the whole structure, and the inspection record is the only thing standing between the site and a complaint. The list is not permanent. County growth changes which places carry programs, which is why every status on this page is dated and re-checked.
The state permit, everywhere
A stormwater pollution prevention plan (SWP3) must be prepared and implemented before construction activities begin. TXR150000's standard schedule requires construction site inspections at least once every 14 calendar days and within 24 hours of the end of a storm event of 0.5 inches or greater. That obligation does not depend on which side of a city limit the dirt sits on.
Inspections and the record
The operator owns the inspection record from first disturbance to final stabilization. Terradyne provides routine SWPPP inspection reports with cloud-based client access. See SWPPP Inspections for how the program works, and Silt Fence Installation for the perimeter a complaint call looks at first.
Check before you mobilize
Ordinances and city standards get revised; confirm the current documents with the city before you mobilize. Permit and waiver statuses change too — the statuses on this page were read from the state's own permit database on the date above. For other North Texas jurisdictions, start at Local Compliance.
Frequently Asked Questions
Does Grayson County itself run a stormwater program for construction?
Not on the pollution-prevention side. What the county runs is a land-use layer — floodplain permitting and subdivision drainage design — and the section above gives the authorization picture with the date it was read.
Which Grayson County cities have their own stormwater programs?
Sherman, Denison, and Pottsboro — each with its own city requirements on top of the state permit. Each has its own guide linked above.
What applies in Gunter, Van Alstyne, Whitesboro, Dorchester, or around Gordonville?
The state permit, in full — the sections above give the checked status for each. Where no city program exists there is no local layer, and no local office reminding you.
Request a bid
Send your Grayson County project's plans to bids@terradynegroup.com or call (214) 878-7392 for SWPPP and erosion control support. Tell us the city — or that there isn't one — and we will bring the plan, the controls, and the record the job actually needs.