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Increasing heavy rainfall events are putting ever-greater strain on public sewer systems. The risk of wastewater being forced back from the main sewer into private drainage lines is growing, and the consequences of such damage are not only costly but often involve extensive remediation work.
Areas below the street level, such as basements, semi-basement apartments (souterrains), or underground garages, are particularly vulnerable to backflow. A professional and reliable backflow prevention system is essential specifically for these situations.
We offer you a "certified backflow protection" as a well-designed complete system. This service ranges from an appraisal of your property and the professional installation of backwater valves and waterproof clean-outs, to regular maintenance and inspection. In this way, you protect your property and significantly reduce the risk of water damage originating from the sewer.
Here you will find answers to the most common questions regarding backflow prevention.
Backflow occurs when the public sewer network is overloaded (e.g. during heavy rain) or when blockages in the sewer or in your own underground drain pipe block the flow. As a result, the wastewater can no longer drain away and is pushed back into the private building pipes. The water rises to the so-called backflow level (usually street level). Without backflow protection, this water can then escape from low-lying drains such as toilets, showers or floor drains and flood basements. You can find a video that explains the topic well here on YouTube.
Professional backflow protection is essential for all buildings with drainage points below street level (the backflow level). However, our experts always start with a professional on-site assessment to check whether protection is necessary for your property and which measure is the right one. We give you honest advice and only recommend what really makes sense for you.
A single backwater valve can only protect a single pipe and is often just a partial solution. For example, if the pipes themselves have leaks or if cleanout openings are not pressure-tight, water can escape at these points. Our certified backflow protection is therefore a complete system that takes exactly these weak points into account.
Our “certified backflow protection” is a complete system that has been tested by an independent body (Fachverband der Ingenieurbüros Österreichs, the Austrian association of engineering consultants). The certification confirms that our entire process – from sealing the sewer system to function testing – meets the highest quality and safety standards.
All backflow protection also includes mechanical systems whose function must be regularly tested so that they provide reliable protection in an emergency. We therefore offer regular testing, care and maintenance to ensure the long-term functionality of your system.
The costs of professional backflow protection depend on local conditions. Our principle is full transparency: After a detailed analysis, you will receive a clear and detailed offer from us without hidden costs.
Yes, you can. With the official online platform HORA (Natural Hazard Overview & Risk Assessment Austria), Austria offers an interactive hazard map. There, you can enter your address directly and get an initial assessment of the flood risk. Regardless of the result, protection against backflow from the sewer is recommended in any case, as it can also occur during local heavy rain events without any river flooding.
Reliable protection against backflow is more than just installing a valve. Our certified process is a complete system built upon accurate analysis and takes all relevant weak points of your system into account.
Every reliable protection concept begins with a professional on-site appraisal of your situation. Our experts analyze your entire sewer system, the inflows, and the surface water. Based on this, we develop an optimal solution tailored to your property, so you can be sure to receive the right protection for your specific situation.
A backwater valve is useless if the pipe system itself is leaking. A central and often overlooked component of our certified protection is therefore the professional sealing of your sewer system. We ensure that water cannot penetrate your building past leaking pipes or clean-outs.
Based on the analysis, we install the certified protection components appropriate for your system. Depending on the requirement, these may be modern backwater valves, automatic backflow preventers, or pumping stations (lifting stations). The installation is carried out by our specially trained technicians in accordance with the strictest technical standards.
A backflow prevention system must be 100% reliable in an emergency. Therefore, a final function test (e.g., through a simulated backflow trial) and regular maintenance are essential. We take over this recurring inspection for you to ensure the long-term safety of your system.
We offer our full range of services to private households, property management companies, and commercial businesses throughout Vienna, Lower Austria, and Burgenland. For larger jobs and planned projects, we also operate on a supra-regional basis.
We provide fast and reliable pipe clearing services across all 23 districts of Vienna. DerKanal is your specialist for professional pipe and sewer cleaning as well as rapid drain clearing – whether in Donaustadt, Favoriten, or Floridsdorf. From our main office in 1230 Vienna-Liesing, we coordinate every job directly across the entire city area.
Our entire service portfolio is available to you without restriction throughout Vienna, Lower Austria, and Burgenland. DerKanal is your reliable specialist for professional drain cleaning, trenchless sewer rehabilitation, separator cleaning, and leak testing. Whether in St. Pölten, Wiener Neustadt, Baden, Mödling, Klosterneuburg, Eisenstadt, Neusiedl am See, or Oberwart—we provide all services directly on-site.
For comprehensive and planned projects—such as liner rehabilitation, specialized milling work, and backflow protection—we extend our service radius to support you in Styria (e.g., Graz, Leoben, Kapfenberg), Upper Austria (e.g., Linz, Wels, Steyr), Carinthia (e.g., Klagenfurt, Villach, Wolfsberg), and Salzburg.