License #1115426
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Backflow Prevention & Testing Fontana, Corona & Rancho Cucamonga

State required testing and repairs to protect your water supply
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Certified Backflow Testing Keeps Your Water Safe and Legal

Got that annual backflow test notice from the water district? Wondering what that weird device on your water line even does? Backflow preventers stop contaminated water from flowing backward into clean water supplies. State law requires annual testing, and we provide certified backflow prevention testing Fontana CA properties need to stay compliant and safe. Skip the fines and protect your water with proper testing and maintenance.

Backflow happens when water pressure drops or reverses, potentially sucking chemicals, bacteria, or waste back into drinking water. Your backflow preventer acts like a one way valve protecting the entire water system. We handle backflow prevention testing Rancho Cucamonga CA businesses and homes require, serving Upland, Corona, Redlands, Glendora, Orange County, Pasadena, and Monrovia. Our certified testers use calibrated gauges to verify your device works properly. C36 License #1115426 plus specialized backflow certification means we're authorized for all testing and repairs.

Commercial properties, irrigation systems, and homes with pools typically need annual testing. Fire sprinkler systems require even more frequent checks. Miss your test deadline and face fines starting at $500 plus potential water service shutoff. We make compliance easy with reminder calls, fast scheduling, and same day test reports filed with your water district. If your device fails testing, we stock repair parts to fix most issues immediately.

Beyond basic compliance, proper backflow prevention protects your family and employees from serious contamination. Imagine pool chemicals, fertilizer, or boiler additives entering your drinking water. We see failed devices every week during backflow prevention testing Corona CA appointments. Regular testing catches problems before anyone gets sick. We also install new backflow preventers for properties adding irrigation, fire systems, or commercial equipment. Don't risk fines, shutoffs, or contaminated water. Schedule your annual test today and we'll handle all paperwork with the water district.

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Current AS Plumbing Promotions

Expert Gas Leak Detection Special: $250

Protect your home and family with professional gas leak detection from AS Plumbing. Even a small gas leak can be a serious hazard. Our licensed technicians use advanced tools and proven methods, including a system-wide pressure test, to accurately find leaks in your gas lines and appliances. Take advantage of our $250 Gas Leak Detection Special. This service includes a thorough inspection of your gas system by a qualified professional and a detailed, upfront estimate for any required repairs. Don't guess when it comes to gas—get the peace of mind that comes from a professional diagnosis. Call today to schedule your safety inspection.
Protect your home and family with professional gas leak detection from AS Plumbing. Even a small gas leak can be a serious hazard. Our licensed technicians use advanced tools and proven methods, including a system-wide pressure test, to accurately find leaks in your gas lines and appliances. Take advantage of our $250 Gas Leak Detection Special. This service includes a thorough inspection of your gas system by a qualified professional and a detailed, upfront estimate for any required repairs. Don't guess when it comes to gas—get the peace of mind that comes from a professional diagnosis. Call today to schedule your safety inspection.

Enjoy Pure, Soft Water From Every Tap & Save $750!

Hard water doesn't just leave spots—it damages your plumbing and shortens the life of your expensive appliances. A whole-home water filtration and softener system is one of the smartest investments you can make to protect your home from costly scale buildup and corrosion. AS Plumbing can install a state-of-the-art system that provides clean, soft water to your entire home. For a limited time, we're making this essential upgrade more affordable than ever with a $750 discount on a complete installation. Protect your pipes, your appliances, and your peace of mind. Contact us today for a free, no-obligation estimate!
This offer provides a $750 discount on a new, complete whole-home water filtration and/or softener system installation by AS Plumbing. A standard installation is assumed; any necessary rerouting of plumbing may be an additional charge. The discount does not apply to repairs or service on existing units. This offer cannot be combined with any other discounts and is valid for a limited time.

Major Sewer Problem? Major Savings! Get $1500 OFF Sewer Line Replacement.

Worried about your sewer line but dread the thought of a torn-up yard? AS Plumbing has the solution. We specialize in modern Trenchless Sewer Repair, a minimally invasive method to replace your main sewer line without the extensive digging, saving your driveway, landscaping, and gardens. This advanced technology provides a brand-new, seamless pipe that is stronger and more durable than the old one. For a limited time, get the best technology and the best price with $1500 OFF your full trenchless or traditional sewer line replacement.
Receive a $1500 discount on a complete sewer line replacement project. Offer is valid for both traditional and trenchless installation methods. The discount is not applicable to sectional repairs, pipe lining, or any service other than a full replacement of the main sewer line. Cannot be combined with any other discounts. Contact us to schedule an evaluation. Offer valid for a limited time.

Get $100 OFF Professional Faucet Installation

Whether you have a leaky faucet that needs replacing or you've already purchased a new one, our professional installation service is the perfect solution. An expert from AS Plumbing will ensure your new kitchen or bathroom faucet is installed correctly and functions perfectly without leaks.
This offer provides a $100 discount on the labor for a single kitchen or bathroom faucet installation. The cost of the new fixture is not included. Additional charges may apply if existing plumbing, valves, or lines require repair or replacement. This special is limited to one per customer and cannot be combined with other offers.

Upgrade Your Kitchen & Save! 25% Off Garbage Disposal Installs

Whether you're replacing a broken garbage disposal or installing a new one for the first time, let our experts handle it. AS Plumbing provides fast, clean, and reliable garbage disposal installations to make your kitchen cleanup easier. For a limited time, take 25% OFF our complete installation service. We'll ensure your new unit is installed perfectly, with secure connections for years of trouble-free use.
Offer is for a 25% discount on the installation service/labor cost. The price of the garbage disposal unit itself is separate. Offer applies to standard installations where suitable plumbing and electrical connections are present. Any necessary modifications will be quoted separately. Cannot be combined with other promotions. Valid during standard business hours.

Protect Your Home & Save $1500 on a Full Repipe!

Invest in the long-term value and reliability of your home with a complete plumbing system replacement. A full repipe from AS Plumbing not only solves issues like poor water pressure and discoloration but also significantly increases your property's value and prevents future emergencies. Our team specializes in efficient, minimally invasive repiping projects. And right now, this essential home improvement is more affordable than ever. We're offering a massive $1500 discount on all full home repipe projects.
Receive a $1500 discount on a complete repipe of your home's hot and cold water supply lines. A minimum project scope is required to qualify as a "full home repipe." Discount is not applicable to drain line replacement, partial repairs, or reroutes. This offer is for a limited time and cannot be combined with other discounts. Call for a free, detailed estimate.

Hidden Leak? Find It Fast for Just $49.99!

Don't let a small leak turn into a huge problem. Hidden water leaks can cause serious structural damage, mold growth, and wasted money on your water bill. For just $49.99, the expert technicians at AS Plumbing will come to your home, use their expertise to pinpoint the exact source of the leak, and provide you with a clear, upfront quote for the repair.
The $49.99 is a diagnostic fee for our leak detection service and does not include the cost of any repairs. Once the leak is located, you will receive a separate, upfront quote for the required repair work. This offer is valid for one leak issue per household during standard business hours. Cannot be combined with other promotions.

New Toilet Installed From Just $209

Need a new toilet? AS Plumbing offers professional installation starting at just $209. We provide fast, reliable service to get your new toilet set up perfectly. We also offer a full range of toilet repair services. Call today to schedule your appointment!
Offer is for installation labor of a standard toilet starting at $209. Price does not include the toilet. Additional charges may apply for flange, valve, or plumbing repairs. Haul-away of old unit is extra. Call for complete details and a firm quote.

Limited Time: Get $799 Off a New Tankless Water Heater!

Never run out of hot water again! Make the switch to a modern, energy-efficient tankless water heater. You'll save space, lower your utility bills, and enjoy hot water on demand. For a limited time, AS Plumbing is making the upgrade even easier with a $799 discount on your new installation.
Offer valid for a limited time. Discount of $799 is applied to the final invoice for a complete tankless water heater installation. A standard installation is assumed; any required modifications to plumbing, gas, electrical, or venting are extra. Customer is responsible for the cost of the city/county permit fee. Cannot be combined with other offers.

Unclog Your Drain for Just $69!

Tired of slow drains or stubborn clogs? Get your pipes flowing freely again with the AS Plumbing Drain Cleaning Special. For just $69, our expert technicians will cable one clogged residential drain line, quickly and efficiently restoring proper flow to your sink, tub, or shower.
$69 special offer is valid for one Residentia/Commercial drain line (e.g., kitchen sink, bathroom sink, tub, shower) with a ground-level, accessible cleanout. Offer does not apply to main sewer lines, drains requiring roof access, or blockages requiring hydro-jetting or toilet removal. Cannot be combined with other offers. Service must be performed during standard business hours.

Most Frequently Asked Questions

How much does backflow testing cost?
Annual backflow testing in Fontana typically costs $75 to $150 per device, depending on type and location. Commercial properties with multiple devices may receive volume discounts. If repairs are needed, parts usually run $50 to $200 with labor included. Complete device replacement ranges from $500 to $1500. Compared to potential fines and water shutoffs, annual testing is cheap insurance. Many property managers include testing in their annual maintenance budgets.
What happens during a backflow test?
Certified backflow testing takes 15 to 30 minutes using specialized gauge equipment. We shut off water temporarily, connect test gauges to specific ports, and check pressure differentials across check valves and relief valves. The device must hold specific pressures to pass. If it fails, we identify which internal parts need replacement. After passing, we file test reports directly with your water district in Fontana or Corona. You receive copies for your records. Most devices pass with proper annual maintenance.
What types of properties need backflow prevention?
Any property with irrigation systems, fire sprinklers, pools, commercial kitchen equipment, boilers, or medical facilities requires backflow prevention in Rancho Cucamonga and statewide. Residential homes with simple hose connections need basic vacuum breakers. Apartments and commercial buildings often have multiple devices requiring annual testing. Properties using chemicals, having alternate water sources, or operating car washes face stricter requirements. We assess your specific needs and ensure proper protection for your water system.
Why is backflow testing required by law?
State and local regulations mandate annual backflow testing to protect public water supplies from contamination. When water pressure drops, contaminated water can flow backward into clean pipes, spreading chemicals, bacteria, or waste throughout the system. Fontana, Rancho Cucamonga, and surrounding water districts require certified testing to ensure devices function properly. Failure to test results in fines starting at $500, potential water service termination, and liability if contamination occurs. Testing protects both public health and your legal compliance.
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