Cross-Connection and Backflow Prevention

Professional Cross-Connection & Backflow Prevention for Clean, Compliant Water In Your Home or Business

Whether you own a home, manage a business, oversee an industrial facility, or manage an institutional property, clean and safe water is essential. At DNL Plumbing Inc., we understand that water is more than just a utility, it’s the foundation of your health and business operations.

Cross-connection and backflow issues can threaten that safety, allowing contaminated water to flow backward into clean water lines. Substances like chemicals, fertilizers, and bacteria can quickly compromise drinking water and even damage your plumbing system.

With more than 20 years of experience, our licensed and insured plumbers provide professional backflow prevention and cross-connection control services for residential, commercial, and industrial properties keeping your water pure and your property compliant with local regulations.

20+

YEARS EXPERIENCE

Understanding Cross-Connection & Backflow Prevention

Backflow happens when water reverses direction in your plumbing system, usually due to a sudden drop in pressure such as during a water main break, system repair, or heavy usage period. When this occurs, contaminants from non-potable sources can be pulled into your clean water lines.

A cross-connection is the link that allows this contamination to occur at a point where potable and non-potable systems meet without proper safeguards. A cross-connection is the physical link that creates the risk, while backflow is the unwanted reverse flow of water that happens as a result of that link. For water contamination to happen, two conditions must be met: there must be an unprotected cross-connection and a backflow incident must occur.

Ontario’s plumbing code, following the Canadian Standards Association (CSA) B64.10, requires approved backflow prevention devices to protect against this hazard. These are one-way valves designed to be installed at a cross-connection point to stop the reverse flow of water and keep the drinking water supply safe. DNL Plumbing Inc. specializes in installing, testing, and maintaining these devices to meet code requirements while minimizing disruption to your property or operations.

Residential Backflow Prevention

For homeowners, our cross-connection and backflow prevention services start with a comprehensive inspection of your plumbing system to identify possible cross-connections, including outdoor faucets, irrigation lines, and heating systems.

We install certified backflow prevention devices such as reduced pressure zone (RPZ) valves or double-check valves, customized to your home’s specific layout. These act as a one-way gate, blocking contaminated water from flowing backward into your household supply. For example, if you have a sprinkler system, an RPZ valve prevents fertilizers or pesticides from ever reaching your kitchen tap.

We also handle annual backflow testing, which most Ontario municipalities now require. Using precision diagnostic tools, we confirm that your system is performing correctly and provide detailed reports for your records. This proactive service protects your family from harmful bacteria like E. coli, ensures compliance, and prevents costly damage before it starts.

Our plumbers respect your home and your time using protective coverings, tidy work practices, and durable materials for discreet, long-lasting installations.

Commercial and Industrial Cross-Connection & Backflow Prevention

In commercial and industrial spaces, water systems are more complex and so are the risks. Restaurants, schools, hotels, manufacturing plants, and healthcare facilities all depend on safe water systems to function smoothly and stay compliant.

DNL Plumbing Inc. delivers custom cross-connection and backflow prevention solutions designed for these demanding environments. We begin with a site-specific risk assessment, identifying potential hazards and recommending the appropriate devices for each location:

We install industrial-grade backflow preventers that meet Ontario’s Ministry of the Environment standards and provide annual testing and maintenance programs to keep your system in top shape. Our certified technicians complete these tests efficiently to avoid downtime and ensure your documentation is ready for inspection.

Reliable water protection doesn’t just prevent contamination, it also reinforces your company’s reputation for safety, responsibility, and care for your staff and customers.

Why Choose DNL Plumbing Inc.?

At DNL Plumbing Inc., we believe knowledge and transparency are the foundation of trust. We take the time to explain potential water quality risks and how our backflow systems safeguard against cross-connection contamination.

With DNL Plumbing, you’ll get:

We’re committed to delivering water safety solutions that are dependable, compliant, and built to last. Whether you’re protecting your family’s drinking water or your business’s entire operation, DNL Plumbing Inc. helps you maintain the clean, reliable water supply you depend on every day.

Contact DNL Plumbing Inc. to book your backflow prevention inspection or annual test.

Cross-Connection & Backflow Prevention Services