Collin County, TX septic permits and regulations
Septic systems in Collin County, Texas are permitted by Collin County Development Services Department under 30 TAC Chapter 285.
Septic permit program
- Program type: County Program
- Authorized agent: Collin County / TCEQ Region
- Own septic program: Yes
- Local rules beyond the state: Yes
- Population: 1,064,465
Permit fee comparison
Average septic permit fee in Collin County: $240. Texas average: $285.
Local rules
Stricter than state minimum per CO No. 2008-187-03-11 and Court Order #2009-516-07-13. Minimum lot sizes: Pre-1983: 1 acre (1.5 with well); 2008+: 1 usable acre (1.5 min with 1 usable if well). Building cannot be occupied until system passes final inspection and License to Operate granted. Applications via Collin County Citizen Self-Service Portal. Review process 6-8 working days (up to 2 weeks). Court Order requires minimum of 3 private third-party inspections within 10 days of final inspection. After initial 2-year service policy, aerobic system owners must obtain maintenance contract within 30 days or self-maintain. Maintenance companies inspect 3x/year at 4-month intervals. Chlorine must be maintained in surface irrigation systems at all times (approved chlorine tablets only). Collin County inspectors may enter property for spot checks or complaints without permission. Aerobic units may not be altered after installation without Septic Repair/Upgrade Permit. Collin County does not require aerobic systems - alternative systems available.
What SepticPro has on file for Collin County
- 8 permit fees with sources
- The agency phone, email and office address
- Setback distances
- Soil and perc test requirements
- Allowed system types
- System design rules
- Inspection requirements
- Maintenance and pumping rules
- Point-of-sale rules
- Installer, designer and pumper licensing
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Draw a permit-ready site plan for Collin County
Enter the address, draw the system on the aerial with the parcel lines and topo, and print it to scale for Collin County Development Services Department. See how SepticPro site plans work.
Other Texas counties
- Anderson County
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- Briscoe County
- Brooks County
Data checked 2026-03-16. Always confirm requirements with Collin County Development Services Department before applying.