Floodplain Permit

You Need a Permit to Build Near a Floodplain in Unincorporated Areas

Building or improving property near a 100-year floodplain in unincorporated Williamson County requires a county permit.

If your land is in or next to a 100-year floodplain, you need a Floodplain Development Permit from Williamson County before you build, add fill, or place a structure. Even if you are outside the floodplain, you may still need a Certificate of Compliance from the county to prove it.

Contact the County Engineer's Office at 512-943-3330. Older floodplain maps for some parts of the county have not been updated in roughly 30 years, so the true flood risk may differ from what the current map shows.

Source to confirm: Williamson County — Floodplain Management

More Williamson County notes

Property Tax Basics

Two Offices Handle Your Property Tax in Williamson County

The appraisal district sets your property's value; the tax office collects the money — and they are separate offices.

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Homestead Exemption

Texas Homestead Exemption Cuts Your School Tax Bill

Williamson County homeowners who live in their home can apply for a $140,000 reduction off the value used to figure school taxes.

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Age 65 / Disability Exemption

Extra Property Tax Breaks for Seniors and Disabled Homeowners

Homeowners who are 65 or older, or who have a qualifying disability, can get an additional property tax exemption and a school tax freeze.

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Disabled Veteran Exemption

Veterans with Service Disabilities Get a Property Tax Break

Texas veterans with a service-connected disability rating of 10% or more qualify for a property tax exemption in Williamson County.

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