Published September 23, 2026
Winterizing a sprinkler system in Central Texas is an above-ground job. Shut the water off at the isolation valve, drain the backflow assembly, insulate what is exposed and switch the controller off. What a Georgetown yard does not need is the compressed-air blowout sold every fall further north, and the reason is written into how the system was installed.
No. The Texas A&M School of Irrigation states it plainly: most landscape irrigation systems in Texas are not designed for a blow out. That method belongs to the Northern United States, where extreme or prolonged freezing drives frost down to the buried pipelines.
Texas installation rules are why. Where a manufacturer does not specify a depth, the Texas Commission on Environmental Quality requires irrigation pipe to be buried at least six inches deep, with six inches of select backfill between the top of the pipe and the natural grade. Six inches of cover is enough here precisely because the frost does not reach the pipe. The vulnerable part of the system is the part the rules require to sit up in the air.
The backflow prevention assembly is above ground by regulation. Under 30 TAC §344.50(b), quoted in the TCEQ's cross-connection control guidance revised in February 2026, a pressure vacuum breaker is installed at a minimum of 12 inches above any downstream piping and the highest downstream opening. It sits up there so water inside the irrigation lines, which §344.62(n) deems non-potable, can never be drawn back toward the drinking supply.
That height protects the water and exposes the assembly. What cracks it is ordinary physics. The USGS puts the density of ice at about 90 percent that of water, because freezing locks the molecules into a lattice that holds them further apart than they sit as liquid. Water trapped inside an assembly does not shrink when it turns to ice. It pushes.
The Texas A&M School of Irrigation gives four, and they are short enough to do in an afternoon.
Before Thanksgiving. The National Weather Service's Austin climate summary puts the average first freeze at November 29 over a 120-plus year record, and at December 1 over the 1991-2020 normals. A freeze there means a minimum temperature of 32 degrees Fahrenheit or below.
An average is not a deadline. The earliest first freeze on record in Austin was October 26, 1924. Joel Pigg, a program specialist with Texas A&M AgriLife Extension, frames the window the way a crew would: prepare in October or November and keep the protection on through March or April. The average last freeze is February 25 on the long record and February 15 over the recent normals, which is later than most wraps stay on.
A multi-day arctic outbreak is a different event from an overnight dip. The Weather Service's account of February 2021 describes an unprecedented eight-day period of winter weather across South-Central Texas between the 10th and the 18th, with every climate site in the region setting 5 to 6 consecutive days of temperature records and burst water pipes among the listed impacts.
The four steps above are written for light to mild freezing events. Ahead of a forecast like that one, the system belongs shut off and drained, not merely wrapped.
It is not a part swap. Under §344.50(e), every backflow prevention assembly has to be tested by a licensed backflow prevention assembly tester upon installation, repair, replacement or relocation. Replace a frozen assembly and a licensed test follows it. That is a rule rather than a preference, and it is why an hour of insulation in November is worth more than it looks.
Georgetown water customers cannot simply run a zone to check it. The Georgetown Water Utility holds customers to a two-day-per-week outdoor watering schedule set by the last digit of the street address: addresses ending 1, 5 or 9 water Tuesday or Friday, 2, 4, 6 or 8 water Wednesday or Saturday, and 0, 3 or 7 water Thursday or Sunday. Irrigation is not permitted between 9 a.m. and 7 p.m. on any day, and Mondays are closed to it entirely, which leaves a 14-hour window of midnight to 9 a.m. and 7 p.m. to midnight on an allowed day.
Watering with a hand-held hose or bucket is allowed any day at any time, so walking the yard with a hose to check a head is not restricted. Running the system is.
Closing a valve, wrapping a pipe and draining an assembly are homeowner work. Opening the system is not. The TCEQ does not require a licence for a person doing irrigation work at their own home, but the same agency's rule is that no person may sell, design, install, maintain, alter, repair, service or inspect an irrigation system in Texas unless licensed by the TCEQ. Connecting a system to a water supply, including installing a backflow prevention device, is work for an irrigation technician under the direct supervision of a licensed landscape irrigator.
If the assembly is already split, or the isolation valve will not seat, that is the point where the call gets made.
Central Texas asks for an above-ground winterization, done in late October or November and left in place until the last freeze passes in February. If you would rather it were handled with the rest of the system, irrigation maintenance covers zone checks, repairs, seasonal adjustment and winterizing before the cold, across Georgetown and the surrounding Central Texas. Commercial properties run on the same calendar with more assemblies to protect.
We shut down, drain and insulate irrigation systems across Georgetown and Central Texas before the first freeze, and start them back up in spring.
