Williamson County Alarm Permit: Cost, False Alarm Fees and How to Register

If your home is in Williamson County outside any city's limits, you need a Williamson County Sheriff's Office alarm permit for each alarm system, monitored or not. It costs $25 for two years. Five false alarms in a one-year period are free; each one after that costs $75.[1,2]

Checked against official Williamson County sources on October 27, 2026. Rules and fees change, so confirm with the Sheriff's Office alarm unit at 512-943-1340 before you rely on them.

Williamson County alarm permit at a glance

Who needs a permitHomes and businesses in Williamson County outside the limits of any incorporated city. Residents inside a city's limits (the county names Hutto and Leander) get their permit from that city instead.[1]
Which alarms are coveredEvery alarm system you own and operate at a home or business, whether or not it is monitored.[1]
Residential permit feeNew: $25
Renewal: $25 · valid 24 months[3,2]
Fee exemptionsNot confirmed. No senior, veteran or low-income fee exemption is listed on the Sheriff's Office alarm pages.
Free false alarms5 in a one-year period that starts with your first false alarm[2]
If you have no permitNot confirmed. The county does not say whether deputies respond to an alarm that has never had a permit. A revoked permit is put on "no response" status until the problem is fixed and all fees are paid.[3]
Runs the programWilliamson County Sheriff's Office, False Alarm Reduction Unit[1]
When to applyNot confirmed. The county does not state a registration deadline. Operating an alarm without a permit is a Class C misdemeanor.[1]

False alarm fees in Williamson County

False alarms are counted over a one-year period that starts with your first false alarm[2]. Each fee below is charged per false alarm.

Residential false alarms (with a permit)

False alarmFee
1st–5thFree[2]
6th and each after$75[2]

If false alarms keep happening: A permit can be revoked for unpaid fines, more than nine false alarms in a one-year period, a false statement on the application, or other violations. A revoked permit is put on "no response" status until the problem is fixed and all fees are paid, and the holder cannot get a permit for another location.[2,3]

How to get or renew a permit in Williamson County

  1. Apply or renew online at alarms.wilco.org[4,2].
  2. Prefer paper? Download the application (Word document)[3].
  3. Questions: call the Sheriff's Office alarm unit at 512-943-1340[4,3].
  4. Address: Williamson County Sheriff's Office, 508 S. Rock St., Georgetown, TX 78626 (mail or in person; checks or money orders payable to Williamson County Sheriff's Office). Applications can also be emailed to so-alarms@wilco.org, then paid by phone.[2,3]
  5. Give your permit number to your alarm monitoring company.
  6. Renew every two years for $25. A renewal notice is mailed 30 days before the permit expires.[2]

Who files: The person operating the alarm (homeowner, tenant or business), not the alarm company. Each apartment occupant who uses the unit's system needs their own permit, and a permit does not transfer to a new owner.[2]

Good to know

  • Self-installed and self-monitored systems: Self-installed and unmonitored systems need a permit too. The county requires one whether or not the system is monitored.[1]
  • Panic and hold-up alarms: Robbery (hold-up) alarms follow the same schedule as burglar alarms: five free false alarms, then $75 each.[3]
  • Before police are sent: Not confirmed. The Sheriff's Office alarm pages do not describe an alarm-verification requirement for monitoring companies.
  • Not sure which rules apply to your address?: Not confirmed. The county's alarm pages do not include an address lookup. If you are not sure whether your address is inside a city's limits, ask the Sheriff's Office alarm unit at 512-943-1340.[4]
  • Nearby rules differ: Travis County (unincorporated) has its own permit and fees. See Travis County alarm permit rules.
  • Nearby rules differ: City of Austin has its own permit and fees. See Austin alarm permit rules.
Business and other non-residential alarms
PermitFee
New permit$25 — commercial[3]
Renewal$25 — commercial[3]
AlarmFalse alarmFee
False alarms1st–5thFree[2]
False alarms6th and each after$75[2]

Avoiding false alarms

  • Make sure everyone who has a code knows how to disarm the system and cancel an alarm.
  • Keep your monitoring company's contact list up to date so they can reach someone quickly.
  • Let your monitoring company know before guests, contractors or pet sitters use the house.
  • Check that doors and windows are fully closed before you arm the system.
  • Replace low sensor batteries promptly.

Thinking about a professionally installed, monitored system? See how SafeStreets installation works.

SafeStreets serves this area: home security in Round Rock.

Sources

  1. Williamson County Sheriff's Office, Law Enforcement Bureau: False Alarm Reduction. Sheriff's Office, False Alarm Reduction Unit tab. www.wilcotx.gov. Checked October 27, 2026.
  2. Williamson County Sheriff's Office, FAQs: Sheriff's Office - Alarms. Permit cost; false alarms; apartments; payment. www.wilcotx.gov. Checked October 27, 2026.
  3. Williamson County Sheriff's Office, Application For Alarm Permit (DOCX, titled 2015) — File last modified August 9, 2023 (document properties). Fees; false alarm fees; revocation. www.wilcotx.gov. Checked October 27, 2026.
  4. Williamson County Sheriff's Office (CryWolf portal), Williamson County False Alarm Prevention and Administration Site. Home page. alarms.wilco.org. Checked October 27, 2026.

Updates

  • October 27, 2026 — first published from official sources.

This page summarizes official Williamson County (unincorporated) rules for homeowners. It is not legal advice. Dataset release 2026-10-29.18. See something wrong or out of date? Tell us and we will check it against the source. You may reuse this data under CC BY 4.0 with credit to SafeStreets and a link to this page.