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Backflow Prevention

Backflow is a serious plumbing issue that can allow contaminated water to enter your home’s clean water supply. At Althoff Home Services, we provide expert backflow prevention testing, repair, and installation services to protect your home and your health. Serving Crystal Lake and the surrounding Chicago suburbs, our licensed plumbers ensure your backflow prevention devices are functioning properly and meet local code requirements.

  • Family owned since 1961
  • We provide quotes before performing service
  • 100% satisfaction guarantee

Whether you need a routine test, urgent repair, or a new backflow device installed, we have the tools and expertise to get the job done right. Let Althoff Home Services help you safeguard your home’s water supply with reliable, professional backflow prevention service. Contact us today to schedule an inspection or consultation.

Proudly serving the Crystal Lake area for over 60 years! 

The Vital Purpose of Backflow Prevention Devices

Backflow occurs when contaminated water flows in the wrong direction, re-entering your home’s clean water supply from the sewer, irrigation system, or other external sources. This can happen during sudden pressure changes in your plumbing system and may introduce harmful bacteria, chemicals, or debris into your drinking water. That’s why backflow prevention devices are so important, they act as a one-way gate, ensuring water only flows into your home, never out and back in.

At Althoff Home Services, we install, test, and repair backflow preventers to keep your home’s water supply safe and up to code. We’ve been protecting homes in Crystal Lake and the surrounding suburbs for decades with proven expertise and trustworthy service. Whether you’re required to install a device or want to take proactive safety measures, our team ensures your system is secure and compliant.

Not All Homes Have Backflow Preventers. Does Yours?

Not every home is equipped with a backflow prevention device, and depending on your plumbing layout, you may be more at risk than you realize. Homes with irrigation systems, private wells, or pressure-based systems are especially susceptible to backflow. If you’re unsure whether your home is protected, Althoff Home Services can perform a simple inspection to find out.

We evaluate your home’s plumbing connections and water usage points to determine if a backflow device is present, functioning, and located where it should be. If installation is needed, we’ll guide you through your options and install the appropriate type of backflow preventer for your system. We always provide quotes before performing service, so you can make informed decisions. With our 100% satisfaction guarantee, you can trust that your water quality is in good hands.

Contact Us for Backflow Prevention Testing and Other Services

Backflow prevention isn’t just about having the right equipment, it’s also about ongoing testing and maintenance. Many municipalities require annual backflow testing to ensure compliance and safety. At Althoff Home Services, we perform certified testing, issue required documentation, and provide fast repairs if any issues are found. If your device fails, we’ll fix it or recommend a replacement, keeping your water supply protected year-round.

We offer 24-hour emergency service in case of suspected backflow or urgent plumbing concerns. Our licensed plumbers are experienced, reliable, and fully trained in backflow system installation and diagnostics. Contact Althoff Home Services today to schedule backflow prevention testing, installation, or repair. Protecting your family’s water is our top priority.

What Are Other Homeowners Saying?

Excellent
Althoff Home Services4.8
Based on 1071 reviews
Very friendly and knowledgeable about anything I needed to know.
Steve Kolasa
4 days ago
Quality service and work !!! Clean and very informative about our AC and Furnace !!! Alex did a fantastic job !!!!
Catherine A
1 week ago
Scott was prompt, very pleasant and did a great job!
Gwen
1 week ago
Extremely pleased with this company and the employees I dealt with so far.
excellent service - professional and friendly. Andres was the best!
Daniel Bochneak
2 weeks ago
Regular interval preventive maintenance check-ups performed by a Althoff's HVAC professional assures that our HVAC system is safe and functioning with the level of efficiency necessary to maintain our household comfort and safety. We have used Althoff Home Services for several years and have always been extremely satisfied with their services. Our Althoff technician Scott is a trusted expert in his profession. We appreciate his diligence and attention to detail that has meaningfully contributed to our home's comfort & safety.
Jason Schumaker
2 weeks ago
Scott White is fantastic
Jim Andrulis
2 weeks ago
Althoff repairman advised me of a problem with my a/c. He gave me some options for repair and the cost estimates. They even sent another man to offer quotes for a whole system replacement. i appreciated the options with no pressure.
Cathy Wilkins
2 weeks ago
We had our A/C inspection today. Nick A on the Althoff Home Services A/C team arrived and checked everything inside and out. Nick was very courteous, polite, friendly and thorough. We were very pleased with his professionalism. This service is included in our annual membership. The office staff and technicians at Althoff Home Services are the reason we have had them servicing our homes since 2002.
Greg M.
2 weeks ago
Thorough check and clean of Furnace and Humidifier. The contact with the office and the work performed by Justin were both done in a professional manner. Thank you.
April Strong
2 weeks ago
He's friendly and efficient. The perfect combination!
Susan Richardson
3 weeks ago
I had a very nice young man for my technician. He checked and cleaned everything and told me all was well. Of course that made me happy. The technician was here to clean and check my heating system for the winter
Gary Newland
3 weeks ago
I appreciate the attention and professionalism. Thank you!
Mandy Bone
4 weeks ago
Althoff has helped us with our boiler system as well as our AC unit. They have repaired old units we had and even installed new ones when we needed. Everyone we worked with was kind, professional, and knowledgeable about the products.
Had difficult bulbs to replace and find they did it a short period of time and the installation was flawless
David Schaak
1 month ago
Very good and informative worker. You could tell that he enjoyed the work.
Melissa Mikos
1 month ago
Matthew was such a pleasure to work with. He explained everything in layperson terms. Which I appreciated because I was extremely stressed out from the whole issue at hand. He gave me several different options to deal with the water damage and diagnose the source of the problem. of the leak. In conclusion, I would and will go to Altoff for all my future plumbing needs.
Ouzelfalls
1 month ago
I recently switched to Altoff Services to do my annual A/C and Heater maintenance. They came this week to do the A/C. they did a thorough job in testing my A/C's cooling efficiency. they tested refrigerant levels.They removed the outside unit's shroud and thoroughly cleaned the unit. This was the first time anyone did that. I was very happy with the work they did.
Chris Warren
1 month ago
We use Althoff Home Services for almost all of our HVAC, Plumbing, and Electrical needs. Pros: - It is easy to schedule an appointment with them. If you are a member of their White Glove Club, you get priority scheduling. - They spend time explaining the work they perform and any recommendations they have. - Their pricing is transparent. Everything is quoted and sent via email, so you know what you are paying every time they come to your house. - Their employees do not work on commission, so there are no high-pressure sales tactics unlike some of their competitors. Cons: - Some of their services are a little expensive. I would hire a handyman to do things like re-seat a toilet or replace a faucet in lieu of hiring of one of their professional plumbers. - They charge to come out to your house to give pricing estimates, but will deduct this from your bill should you choose to use them. I highly recommend Althoff’s and their team of professional staff!
John Ruder
1 month ago
Always a pleasant experience when Todd comes for the annual inspection of the ROZ Valve. Polite, good conversation, explains what’s being done.
Logan Maughan
2 months ago
Quick and easy service, Nick was great. Their membership plan is really good too.
DAWN WADDICK
2 months ago
⭐️⭐️⭐️⭐️⭐️ I wholeheartedly recommend Althoff Home Services for all your heating, air-conditioning, plumbing, and electrical needs! With over 30 years of homeownership and countless service experiences, I can confidently say Althoff is the BEST. Their integrity, honesty, and customer-centric approach are unmatched. They're thorough, transparent, and genuinely care about building relationships. Although their service agreement costs a bit more, the exceptional service and personalized attention are worth every penny. They'll walk you through every step, show you the work, and offer valuable tips. I've been blown away by their performance, and I'm sure you will be too! Don't hesitate - give Althoff a try, and you'll see why they're the gold standard 👍
Cynthia K
2 months ago
Joe did A+ work on my plumbing job today.
Richard Elke
2 months ago
Scott was very professional. He explained all of our options and costs. He inspected our sub pump.
Kimberly Ritter
2 months ago
Timely, respectful and knowledgeable.
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