Dallas County, TX SWPPP & Stormwater Requirements
Dallas County holds the region's biggest city and some of its strictest small towns, and the distance between their rulebooks is wider than anywhere else in the Metroplex. The same project can face three very different reviews depending on which side of a city line it sits.
What are the SWPPP and stormwater requirements in Dallas County?
The state permit is the shared floor: TXR150000 defines small construction activity to include clearing, grading, and excavating that disturb at least one acre and less than five acres. But in this county the floor is only the beginning - Dallas applies its own code at every project size, and the suburbs add clocks and gates of their own.
Where the county fits
On unincorporated Dallas County land the state permit generally governs, connected to the county through the storm sewer a site drains into. Two days before commencing construction activities, primary operators must provide a copy of the signed NOI to the operator of any MS4 receiving the discharge and to any secondary construction operator. Where the county operates that receiving system, the county gets the copy. But unincorporated ground is scarce here - almost every Dallas County site sits inside a city, and the city is where the review lives.
The cities set the specifics
Three jurisdictions show the spread - the Phase I core city, a suburb with a stricter clock, and a town that polices its curbs.
Dallas. The headline is the threshold, because there is not one. All construction activities, regardless of size, taking place in Dallas must comply with Dallas City Code Sec. 19-118. The state layers stack on top of that. Construction activities in Dallas that disturb at least one acre and less than five acres must comply with the TPDES rules for small construction sites in the TXR150000 Construction General Permit, in addition to Dallas City Code requirements. City code and state permit run in parallel - satisfying one does not satisfy the other.
Garland. The city inserts itself before the first shovel. Any operator seeking coverage for stormwater discharges from a construction site under the TPDES construction general permit must submit a signed copy of the notice of intent — or, for one-to-five-acre projects, the site notice — to the City of Garland at least two days prior to the commencement of construction activities. And its inspection clock is stricter than the state's either-or schedules. Garland's stormwater code requires qualified personnel to inspect disturbed areas, exposed material storage, structural control measures, and vehicle entry and exit points at least once every seven calendar days and within 24 hours of the end of a storm that is 0.5 inches or greater. That is a weekly cadence and a rain trigger, together.
Highland Park. The town shows how much weight a small jurisdiction can put behind housekeeping. Highland Park's Storm Water Protection Measures for erosion and sedimentation control were implemented by the Town Council and the Town's Engineering Department effective January 28, 2013, and must be continuously maintained by the builder during the course of construction. The enforcement is direct. In Highland Park, if improper maintenance is observed, the job can be shut down and citations issued for allowing mud, dirt, or debris to leave the building site.
Why the deltas matter
A Dallas County bid priced to the state permit alone is priced to the wrong document. Dallas reaches below the state's acreage floor, Garland compresses the inspection cycle and demands notice before mobilization, and Highland Park can stop a job over a dirty curb. The controlling city is the first fact to establish on any site here - everything downstream of it, from the plan to the inspection calendar, follows that answer. Neighboring counties run the same two-layer pattern with their own city quirks: Collin County, Tarrant County, and Denton County.
Frequently Asked Questions
Does the one-acre state threshold protect small projects in Dallas?
Not inside the City of Dallas. The city applies its own code to construction at every size, so a project too small for state permit coverage still answers to the city's requirements. The acreage floor only decides which state-permit layer stacks on top.
How is Garland's inspection schedule different from the state's?
The state permit offers alternative schedules; Garland's code sets a compound one - at least every seven calendar days, plus a same-next-day check after a half-inch storm. On a rainy week that means multiple documented inspections, and the record needs to show them.
Can a Dallas County town really stop a job over erosion controls?
Highland Park's published measures say exactly that: improper maintenance can bring a shut-down and citations for mud, dirt, or debris leaving the building site. Small jurisdictions with tight streetscapes tend to enforce housekeeping hardest.
Which jurisdictions does this guide cover?
The City of Dallas, Garland, and Highland Park - the county's biggest program, a stricter-clock suburb, and a strict small town - each verified against the jurisdiction's own published code or measures.
Request a bid
Send your Dallas County project - its city, acreage, and start date - to bids@terradynegroup.com or call (214) 878-7392, and the plan is built to the jurisdiction that actually reviews it. The full jurisdiction map is at Local Compliance.