Septic permits and fees in Grayson County, Texas
A septic system permit in Grayson County costs $310. The county sets that fee in its own schedule. Grayson County OSSF Division issues the permit. State rules fix the tank floor at 750 gallons. A private well needs 100 feet from the drainfield, a property line 5 feet. Grayson County Development Services Fees (revised 04/14/2026) · checked 2026-10-05
$310
Septic system permit
checked 2026-10-05
750 gallons
Tank floor, state rule
checked 2026-09-23
100 feet
Drainfield to a well
checked 2026-09-23
Which septic permit applies in Grayson County?
The septic system permit, and it starts with the site evaluation. A licensed site evaluator or engineer must do a site evaluation first. The permit follows a passing evaluation. The building permit follows the septic permit.
Grayson County OSSF Division — OSSF Permitting Requirements · checked 2026-10-05
What are the current septic fees in Grayson County?
$310 for a septic system permit, on the county's own fee schedule.
Applies to a conventional system with a flow of 0 to 1000 gallons a day.
| Conventional System Permit | $310 | a conventional system of 0 to 1,000 gallons a day |
|---|---|---|
| Conventional System Permit | $620 | a conventional system of 1,001 to 2,000 gallons a day |
| Conventional System Permit | $930 | a conventional system of 2,001 to 3,000 gallons a day |
| Conventional System Permit | $1,240 | a conventional system of 3,001 to 4,000 gallons a day |
| Conventional System Permit | $1,550 | a conventional system of 4,001 to 5,000 gallons a day |
| Aerobic System Permit | $20 | a aerobic system the source lists as Add $20 to Conventional System Permit |
| Repair Permit | $100 | a repair system |
| Paper Application Processing Fee | $50 | a system the source lists as Add $50 |
| Reinspection Fee | $100 | any system |
| Contract Renewal | $20 | any system |
| Contract Renewal Late Fee | $125 | a system the source lists as Add $125 |
A system with a maintenance contract pays an extra fee.
Grayson County Development Services Fees (revised 04/14/2026) · checked 2026-10-05
How long does a septic permit take in Grayson County?
7 days.
Applies to the permit process, which takes five to seven days.
Grayson County OSSF Division — OSSF Permitting Requirements · checked 2026-10-05
What state law fixes for every Texas system
-
750 gallons minimum septic tank capacity
Applies to a design wastewater flow of 250 gallons a day or less.
30 TAC §285.91(2), Table II -- Septic Tank and Aerobic Treatment Unit Sizing · checked 2026-09-23
-
100 feet from a private well to the drainfield
Applies to the drainfield's distance to an ordinary private well or a cistern. It does not cover a public well, or a well sealed under 16 TAC 76.1000(a)(1).
Texas Administrative Code, Title 30, Chapter 285, Section 285.91(10), Table X · checked 2026-09-23
-
5 feet from any property line
Applies to a septic tank, measured to a property line, a building, or a swimming pool.
30 TAC §285.91(10), Table X -- Minimum Required Separation Distances for On-Site Sewage Facilities · checked 2026-09-23
What Grayson County requires that the state does not
-
1.5 acres
Applies to a lot with no public water and no drip irrigation system.
The state sets no such lot size, so this rule is the county's own.
Order Adopting Rules of Grayson County, Texas for On-Site Sewage Facilities, Section 10(E)(1)(a) · checked 2026-10-05
-
1 acre
Applies to a lot with public water and no drip irrigation system.
Order Adopting Rules of Grayson County, Texas for On-Site Sewage Facilities, Section 10(E)(2)(a) · checked 2026-10-05
-
The lot must use an aerobic system.
Applies to a lot under 2.5 acres.
The county sets this rule on top of the state rules.
Order Adopting Rules of Grayson County, Texas for On-Site Sewage Facilities, Section 10(D) · checked 2026-10-05
-
A lot within 100 feet of a public sewer must connect to it.
Applies to a lot within 100 feet of a public sewer.
The County Engineer may approve a waiver in writing.
Order Adopting Rules of Grayson County, Texas for On-Site Sewage Facilities, Section 10(C) · checked 2026-10-05
-
Every RV must use an aerobic system.
Applies to a lot with four or more RVs.
Order Adopting Rules of Grayson County, Texas for On-Site Sewage Facilities, Section 10(G) · checked 2026-10-05
Where do you file the application with Grayson County OSSF Division?
Grayson County OSSF Division, 100 W. Houston, Ste. G3, Sherman, TX 75090, (903)-813-4253 or (903)-813-4247.
Grayson County Development Services · checked 2026-10-05
The steps, in the county's order
- Get a current 911 address and your property ID number. The county accepts no application without them.
- Hire a licensed site evaluator or a licensed engineer. The evaluator checks what type of system the lot can use.
- Hire an engineer or a sanitarian to design the system. This applies when the site cannot take a standard one.
- Send the full paperwork with the permit fee.
- Wait for the Authorization to Construct before you start work.
- Call the office one working day before the final inspection.
Grayson County OSSF Division — OSSF Permitting Requirements · checked 2026-10-05
How do you get a copy of your septic permit record in Grayson County?
Ask Grayson County OSSF Division for the permit record for the property. Call (903)-813-4253 or (903)-813-4247 or start at its website.
Grayson County OSSF Division — OSSF Permitting Requirements · checked 2026-10-05
Search and apply for permits on the county's online portal.
Grayson County — MyPermitNow Navigation Guide · checked 2026-10-05
Sources
Each figure on this page has a government source and a checked-on date.
- Grayson County OSSF Division — OSSF Permitting Requirements
- Grayson County Development Services
- Order Adopting Rules of Grayson County, Texas for On-Site Sewage Facilities, Section 10(E)(1)(a)
- Grayson County Development Services Fees (revised 04/14/2026)
- Grayson County — MyPermitNow Navigation Guide
- 30 TAC §285.91(2), Table II -- Septic Tank and Aerobic Treatment Unit Sizing
- USDA NRCS Soil Data Access (SSURGO)
Verify before you act. Septic rules are set locally and they change. Check anything here before you spend money on it. Call the Grayson County OSSF Division, on (903)-813-4253 or (903)-813-4247.