Backflow Prevention & Testing Fontana, Corona & Rancho Cucamonga

State required testing and repairs to protect your water supply
Schedule Backflow Test

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.

Customer Satisfaction

Our top priority is customer satisfaction, ensuring every client is happy with our work.

Expert Plumbing Services

AS Plumbing offers expert plumbing services with a team of certified professionals.

Quality Assurance

We guarantee quality workmanship and use high-grade materials for all projects.

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.

Current AS Plumbing Promotions

Full Home Repipe

$1,500 Off

Solve low pressure and water quality issues permanently
Increase property value and prevent future emergencies
Minimally invasive installation protects your home
Get Free Estimate
November 15, 2025
$1,500 discount on complete hot and cold water supply line repipe. Minimum project scope required. Does not include drain lines. Limited time offer.

Leak Detection Special

Free Leak Detection

Expert detection finds hidden leaks fast
Prevent structural damage and mold growth
Clear upfront pricing for any needed repairs
Find My Leak
November 15, 2025
Diagnostic fee only, does not include repairs. Repair quote provided separately. Valid for one leak issue per household during standard business hours.

Water Heater Special

$799 Off

Endless hot water on demand—never run out
Lower utility bills with energy-efficient technology
Space-saving design—no bulky tank needed
Save $799 Now
November 30, 2025
Discount applied to complete tankless installation. Modifications to plumbing, gas, electrical, or venting extra. Customer pays permit fees. Limited time offer.

Drain Cleaning Special

$69

Expert cable cleaning of one drain line
Fast restoration of proper water flow
Service for kitchen, bathroom, or shower drains
Clear Your Drain
December 31, 2025
Valid for one residential drain line with accessible ground-level cleanout. Does not include main sewer lines, hydro-jetting, or toilet removal. Standard business hours only.

Gas Leak Detection

$250

Licensed technicians with advanced detection tools
System-wide pressure test of all gas lines
Detailed upfront estimate for repairs
Protect Your Home
November 30, 2025
Valid for residential properties only. Cannot be combined with other offers. Some restrictions may apply.