How to Properly Install a Water Softener Drain Line

One of the most overlooked—yet most critical—parts of any water softener installation is the drain line. If installed improperly, it can lead to backflow, contamination, or even code violations. At Passaic Bergen Water Softening, we make sure the job is done right, every time.

Our owner, Joe Murino, recently walked through the correct way to install a softener discharge line. Too often, we visit homes where a handyman or unlicensed installer simply drills a hole and sticks the discharge pipe into the plumbing. It might work temporarily, but it’s not safe, and it’s definitely not up to code.

Here’s how we do it the right way:

1. Tap into the main drain line correctly

We install a secure T-fitting into the main drain—not just a hole in the pipe.

2. Add a check valve

This prevents any wastewater from flowing backward into your softener if there’s ever a clog or backup in your plumbing.

3. Install a vent

A vertical vent above the drain line lets air escape so the system can drain smoothly without gurgling or airlock.

4. Use a trap

The trap acts as a barrier, keeping sewer gases from traveling back into your home.

5. Include a funnel with an air gap

We never stick the discharge pipe directly into a drain. Instead, it ends above a funnel or standpipe with an air gap. This ensures that, even if the check valve fails, contaminated water can’t siphon back into the softener system.

Each of these steps isn’t just “best practice”—they’re required by plumbing code. Improper drain connections can create a dangerous cross-connection between your home’s clean water and wastewater systems.

When you hire PB Water, you’re getting more than just a system. You’re getting a licensed, code-compliant installation that protects your home, your water, and your peace of mind.

Not Sure if Yours Was Installed Properly?

If your system was installed by someone else—or you’re seeing leaks, bad smells, or poor drainage—give us a call. We’ll inspect your setup and recommend the right solution.

Need a Water Softener Installed?

If you’re not sure whether your home needs a water softener, we can help with that too. PB Water offers free consultations to evaluate your water quality and help you decide if a softener makes sense for your home.

We’ll test your water, explain your options, and give you an honest recommendation—no pressure, just clear answers.

Call today:
📞 973-697-6055 | 201-493-1111
🌐 pbwatersoftening.com