Houston exurbs + DFW fringe

Septic permits on the DFW fringe: Collin, Denton, Rockwall, Tarrant, and Dallas

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Focus: septic permits and local rules by county
Geo: Collin, Denton, Rockwall, Tarrant, and Dallas counties
Last updated: 2026-10-05

What each county publishes on its own site as of the date above. Cities can be their own authorized agents (Tarrant County lists several), so always confirm with TCEQ’s authorized agent search. State basics: Texas septic rules and permits.

At a glance

Collin County

• Where to apply: outside city limits, apply through Collin County’s Citizen Self-Service portal. Inside city limits you may still apply to the county — TCEQ’s list shows the authorized agent for each city; if your city isn’t listed, Collin County is the authorized agent (Collin County OSSF page).
• Stricter local rules: a county court order (CO No. 2008-187-03-11) adds requirements beyond 30 TAC 285.
• Adding a structure or pool on a property with an existing OSSF (where the county is the authority) requires a “review of existing OSSF for new construction/improvement” permit.
• Lot size: lots divided between 1983 and 2008 must start with at least 1 acre (1.5 acres with a water well); lots divided in 2008 or later need 1 usable acre (1.5 acres with 1 usable if there’s a well).
• Permit life: OSSF permits expire after 365 days of no activity.
• Buying a home with an aerobic system: the county requires a Change of Ownership form, an Aerobic Wastewater Homeowner’s Information sheet, and a maintenance contract in the new owner’s name, submitted through its OSSF Report Portal.
• Development Services: (972) 548-5585.

Denton County

• Permitting office: the Environmental Health Division of Denton County Public Health administers the county OSSF order in unincorporated Denton County. Phone: 940-349-2920.
• When a permit is needed: to install, repair, extend, or alter an OSSF in any manner in the unincorporated county.
• Published fees (county handout “What You Must Know”): $310 for a new system; $100 for repairs or other modifications. Confirm current fees with the county.
• Before the permit: a floodplain development permit or culvert permit may be required by the county planning department; site evaluation (site plan and soil texture) by a licensed professional engineer or a licensed Site Evaluator who holds a registered sanitarian license; a valid maintenance contract and recorded affidavits when required.
• Final inspection: done by the county; call at least 2 days ahead. The owner gets a Notice of Approval, which must be in hand before the system goes into use.

Rockwall County

• The Rockwall County Environmental Health Coordinator lists OSSF permitting and inspections among its duties and publishes an OSSF Permit Application, OSSF Affidavit, and Change of Ownership form.
• Office: 1101 E. Yellowjacket Lane, Suite 130, Rockwall; 972-204-7600.
• We could not find more detailed local rules published online; call the office for fees, lot-size, and aerobic contract requirements.

Tarrant County

• Who regulates: per the Tarrant County OSSF page, the county regulates OSSF inspection and permits for 23 cities and the unincorporated parts of the county. Its FAQ lists the other authorized entities: the Tarrant Water Improvement District (within 2,000 feet of Eagle Mountain Lake), the City of Arlington, the City of Burleson, the City of Fort Worth, and Fort Worth Lake Management in certain areas around Lake Worth.
• Lot size: on November 11, 2025, the Commissioners Court adopted (Court Order 146317) that subdivisions of single-family dwellings must have lots of at least one acre, net of drainage and floodplain easements. Nearly all unincorporated land is in a city’s extraterritorial jurisdiction (mostly Fort Worth’s), which can add requirements.
• Aerobic with surface spray: the county’s FAQ says surface disposal requires an approved unit plus disinfection, a design for that purpose, and an ongoing maintenance contract with periodic testing.
• Homeowner install: the FAQ says a homeowner may install for a single-family residence; multi-family, rental, or nonresidential property requires a licensed installer.
• OSSF questions: 817-212-7082.

Dallas County

• Permitting office: Dallas County Health & Human Services — Environmental Health Division reviews designs, issues permits, and inspects installations. Phone on the application: (214) 819-2112.
• Application requirements (county OSSF permit application): a signed statement from Dallas County Public Works or a city official that the property is not in the 100-year floodplain (buildings and the OSSF must be out of the floodplain); site evaluation by a TCEQ-licensed Site Evaluator; plat or survey; design by a registered sanitarian or registered professional engineer.
• Surface irrigation (aerobic spray): submit a valid maintenance contract and a recorded affidavit filed against the property deed. ET drain fields also need a recorded affidavit stating the flow rate.
• Fees and timing listed on the form: $260 residence, $310 commercial; allow at least 30 working days for review.

What this means for a DFW-fringe homeowner

• Blackland clay is common across this belt, and aerobic spray systems are widespread — see aerobic vs conventional.
• A maintenance visit is not a pump-out. Pumping is a separate job for a TCEQ registered sludge transporter — verify the registration and compare DFW pumping cost bands.
• Buying? Collin and Rockwall both publish change-of-ownership paperwork. See buying a home with septic.

Related guides

• Texas septic rules and permits (TCEQ basics)
• Aerobic vs conventional septic in Texas
• Aerobic maintenance contracts in Texas
• Buying a home with septic in Texas
• Houston-area county permit notes (Harris, Fort Bend, Montgomery)

Sources

• Collin portal, authorized-agent check, court order, review permit for new structures/pools, lot sizes, 365-day expiry, aerobic change-of-ownership forms, phone — Collin County Development Services: On Site Sewage Facilities
• Denton program scope and phone — Denton County Public Health: Environmental Health Division; permit triggers, $310/$100 fees, site evaluation credentials, final inspection, Notice of Approval — Denton County: What You Must Know (OSSF)
• Rockwall duties, forms, address, phone — Rockwall County: Environmental Health Coordinator
• Tarrant scope (23 cities + unincorporated), Court Order 146317 one-acre rule, ETJ note, phone — Tarrant County: On-Site Sewage Facilities
• Tarrant other authorized entities, surface-disposal contract requirement, who can install — Tarrant County OSSF FAQ
• Dallas program role — Dallas County HHS: Environmental Health Division; floodplain statement, site evaluator, design, surface-irrigation contract + affidavit, $260/$310 fees, 30 working days — Dallas County OSSF permit application (PDF)
• Authorized agent lookup — TCEQ OARS