On-Site Sewage

Properties Without City Sewer Need a Permitted Septic System

Rural homes in Collin County that are not on a city sewer line must have a permitted On-Site Sewage Facility (OSSF) — and the lot must be large enough to support one.

Collin County Home & Property

Collin County regulates septic systems through its Development Services department. For lots created after 2008, you need at least 1 usable acre for an OSSF permit. If the property also has a water well, the minimum rises to 1.5 acres total with 1 usable acre. Lots created between 1983 and 2008 need at least 1 acre; with a well, 1.5 acres.

A licensed Registered Sanitarian or Professional Engineer must design the system. The permit expires if there is no activity for 365 days. If you are buying rural land in Collin County, confirm the lot size meets these requirements before assuming you can build. Information on permitted installers and the application process is at collincountytx.gov.

Source to confirm: Collin County Development Services FAQ

More Collin County notes

Property Tax Relief

How the Homestead Exemption Lowers Your Property Tax Bill

If you own and live in your home in Collin County, you can apply for a homestead exemption that removes part of your home's value from the tax calculation.

Read note ->

Property Tax Basics

Two Offices Handle Property Taxes in Collin County

Two separate offices deal with your property taxes. One sets your home's value. The other sends your bill and collects payment.

Read note ->

Agricultural Appraisal

Land Used for Farming Can Be Taxed at a Much Lower Rate

Texas law lets land used for farming be taxed on its farming value, not its full market value. This can sharply lower the tax bill.

Read note ->

Special Districts

Many New Subdivisions Have an Extra Tax Line for a MUD or PID

Many new neighborhoods in Collin County have an extra charge on top of regular property taxes. It pays for water lines, roads, and parks built by the developer.

Read note ->