Permitted & Code-Compliant
Every install is 100% code-compliant and permitted. No shortcuts that turn into a failed inspection — or a denied insurance claim — years later.
Backflow Preventers
It Protects the Drinking Water, and It Is Usually Required
A backflow preventer stops water flowing the wrong way — from an irrigation system, a boiler or a commercial process back into the drinking supply. It matters because the water on the wrong side of that valve is not water you would drink.
Most Texas water suppliers require annual testing on assemblies serving irrigation and commercial premises, by a licensed tester, with results filed. We test, certify and submit the paperwork so the requirement is actually met rather than merely intended.
- Master Plumber M-19076 — licensed by the Texas State Board of Plumbing Examiners.
- Local since 1986 The Wizards of Comfort, based in Fredericksburg.
- Backed in writing Written guarantees on every job we do.
What to Watch For
When You Need One Tested
Usually annual, and usually mandatory.
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You received a notice from your water supplier
Annual certification is due.
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You have an irrigation system
The most common residential requirement.
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You run a commercial premises
Almost always required, often more than one assembly.
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The assembly is discharging
A failed relief valve needs attention now.
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No test in over a year
You are out of compliance.
What We Do
Backflow Services
Testing, repair, installation and filing.
- Certified annual testing By a licensed tester, with results filed for you.
- Repair and rebuild Relief valves, checks and springs.
- New installation Correct assembly type for the hazard level.
- Freeze protection Assemblies sit outdoors and split in a hard freeze.
How It Works
How a Backflow Preventers Works
You get findings and evidence, not a sales pitch.
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Schedule the Visit
We book a window that suits you and arrive when we said we would.
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Inspect and Document
We use the right equipment for the job — cameras, meters, pressure tests — and document what we find rather than describing it.
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Walk You Through It
You see what we saw, in plain language, including what is fine and what is not.
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Options, If Any Are Needed
If something needs work you get written options and pricing. If nothing does, we tell you that too.
Current Specials
Save on the work your home needs most.
Plumbing
$50 Off
$50 Off Any Heating Service
Any Heating Service Call
Expires 12/31/2026
Plumbing
$99
$99 Water Heater Tank Flush and Safety Check
Water Heater Tank Flush & Safety Check
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Plumbing
Up to $300 Off
Up To $300 Off A New Tank Water Heater
A New Tank Water Heater
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Plumbing
$50 Off
$50 Off Any Plumbing Service
Any Plumbing Service Call
Expires 12/31/2026
Why Choose 72 Degrees
Fully Stocked Trucks
Our trucks carry the parts the Hill Country actually needs, so most repairs are finished on the first visit instead of waiting on a return trip.
Fair, Upfront Pricing
You approve the price before we start. No surprises on the invoice, and no overtime premium for nights or weekends.
Written Guarantees
Our work is backed in writing. If something is not right, we come back and make it right.
Available 24/7
A 100-degree August afternoon and a February hard freeze do not keep business hours. Neither do we.
The Wizards of Comfort
Serving Fredericksburg, Kerrville, Boerne and the surrounding Hill Country since 1986 — nearly four decades in the same communities.
Book a Backflow Preventers
Clear findings, documented, with no obligation to proceed.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
I call 72 Degrees for ALL my AC, HVAC, and plumbing needs, large and small. They provide reliable and friendly service, indeed!
Maintenance Membership
Join the Care Club
Total home comfort care, on a schedule.
Members get priority scheduling, seasonal HVAC tune-ups, an annual whole-home plumbing safety inspection, and exclusive discounts — for less than the cost of a single emergency call.
- Priority scheduling
- Seasonal HVAC tune-ups
- Annual safety inspection
- Exclusive member discounts
- Free dispatch on repairs
- No long-term contracts
Backflow Preventers — Common Questions
Can a Faulty Backflow Preventer Cause Water Contamination? What Signs Would I Look For?
Warning Signs That a Backflow Preventer May Be Failing
A backflow preventer is designed to stop contaminated water from reversing direction and entering your potable water system. When the device fails, contamination can occur, especially in systems connected to irrigation, chemicals, or non-potable water sources. One of the most noticeable warning signs is discolored or cloudy water coming from faucets. Unusual tastes or odors in your water can also indicate that contaminants are entering the system. For homeowners and businesses in Fredericksburg and across the Texas Hill Country, another possible sign is a sudden drop in water pressure, which may signal internal valve issues within the backflow preventer. Because these problems aren’t always visible, professional inspection is important when symptoms appear. Prompt evaluation and repair help protect water quality, maintain code compliance, and ensure your plumbing system continues to operate safely.
How Do I Know Which Backflow Preventer Is Right for My Property?
How Do I Know Which Backflow Preventer Is Right for My Property?
Most homeowners don’t think about backflow preventers until they install a sprinkler system, upgrade outdoor plumbing, or receive a notice from their water provider. The right device depends on how your plumbing system is used and what level of protection is required.
A backflow preventer helps stop contaminated water from flowing backward into your clean water supply. This is especially important for irrigation systems, outdoor water lines, pools, and certain commercial setups.
The correct backflow preventer for your property is usually based on a few key factors:
- What the water line is connected to (sprinklers, irrigation, pool fill, indoor plumbing)
- The level of contamination risk involved
- Local requirements from your water provider or plumbing code
- Whether the property is residential or commercial
In many Texas Hill Country homes, a pressure vacuum breaker (PVB) is commonly used for sprinkler and irrigation systems. Other properties may require a different type of device depending on the application.
The best way to know for sure is to have a licensed plumber inspect your setup, explain your options clearly, and recommend the right backflow preventer for your property.
What Is a Backflow Preventer?
How a Backflow Preventer Protects Your Water Supply
A backflow preventer is installed in a plumbing system to keep water flowing in only one direction—away from your home’s clean water lines. Backflow can occur when there’s a sudden drop in water pressure, such as during a main break or heavy water demand, which can pull contaminated water back into the potable supply. This is especially common in systems connected to irrigation, outdoor hoses, or other non-potable water sources. For homeowners and businesses in Fredericksburg and across the Texas Hill Country, backflow preventers play an important role in protecting drinking water quality and meeting local plumbing regulations. These devices use internal valves or air gaps to automatically block reverse flow when pressure changes occur. Proper installation, regular testing, and maintenance ensure the backflow preventer continues to function correctly, keeping your water safe, clean, and compliant with local requirements.
How Often Should a Backflow Prevention Device Be Tested and Maintained?
Why Annual Backflow Testing and Maintenance Is Important
Backflow prevention devices protect your drinking water from contamination, but they rely on internal valves and seals that can wear out over time. Annual testing verifies that the device is responding correctly to pressure changes and preventing reverse water flow. Regular maintenance also helps catch small issues early, before they lead to device failure or compliance problems. For homeowners and businesses in Fredericksburg and across the Texas Hill Country, annual testing is often required by local municipalities, especially for irrigation systems and commercial properties. Professional testing and maintenance ensure your backflow preventer remains code-compliant, protects water quality, and reduces the risk of unexpected repairs or failed inspections.
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