A clean, well-maintained church facility is one of the simplest ways to make people feel welcomed and cared for. But few things can ruin that first impression faster than an unpleasant sewer odor wafting from the restroom. The good news? In many cases, the fix is surprisingly simple — and it starts with a little water.
The Root Cause: Dry Floor Drains
Most commercial bathrooms, including those in churches, have floor drains designed to prevent flooding and safely direct wastewater into the plumbing system. These drains are equipped with a P-trap, a curved section of pipe that holds water to block sewer gases from rising into the facility. However, if the water in the P-trap evaporates, sewer gases can escape into the restroom, creating that unmistakable foul odor.
Why is This Happening More Often?
In years past, churches typically cleaned restroom floors with wet mops, which naturally sent water into the floor drains and kept the P-traps full. But as many facilities have shifted to dry mopping, Microfiber mopping, spray mops, or automated floor cleaners, less water makes its way into those drains. As a result, the water in the P-traps evaporates more quickly, increasing the chances of sewer odors escaping into the restroom.
The Simple Fix: Add Water to the Floor Drain
The most common cause of sewer odors in church restrooms is a dry P-trap in the floor drain, and fortunately, the solution is both quick and inexpensive. To stop the smell and prevent it from returning, follow these steps:
1. Locate the Floor Drain
Look for a small, grated drain on the restroom floor, typically positioned near toilets, sinks, or in the center of the room.
2. Add Water to the Drain
Slowly pour 1–2 gallons of clean water directly into the drain. This refills the P-trap, creating a water barrier that blocks sewer gases from escaping into the room.
3. Consider Adding Mineral Oil
For drains in restrooms or areas that don’t see regular use, pour a few tablespoons of mineral oil on top of the water. The oil forms a thin layer that helps slow evaporation, extending the time between refills.
4. Make It Part of Your Routine
In spaces that aren’t cleaned with wet mops or don’t see regular traffic, add this simple task to your monthly maintenance checklist. Regularly topping off floor drains can prevent odors before they start and keep your restrooms smelling fresh.
5. Check Other Floor Drains
Remember — this issue isn’t limited to restrooms. Floor drains in mechanical rooms, kitchens, and janitorial closets can also dry out over time. It’s wise to inspect and refill those periodically as well.
Additional Tips to Prevent Sewer Odors
While dry P-traps are the most common cause of restroom odors, these additional practices can help keep your facilities fresh:
- Check unused bathrooms: Run faucets, flush toilets, and add water to floor drains in seldom-used restrooms at least once a week.
- Inspect other drains: Don’t overlook floor drains in janitorial closets, kitchens, or mechanical rooms. These can dry out too.
- Ensure proper ventilation: Make sure exhaust fans are working and vents are clear. Poor airflow can cause odors to linger longer than necessary.
- Address plumbing Issues if needed: If smells persist, you may have a clogged vent stack, cracked pipe, or failing toilet wax ring — issues best handled by a plumber.
Stewardship in Facility Maintenance
Keeping your church’s bathrooms clean and odor-free is more than just a maintenance task—it’s a stewardship responsibility. A well-maintained facility reflects excellence, care, and a commitment to welcoming every guest.
If your church is facing ongoing facility challenges, don’t wait for small issues to become big problems. Contact our team today to develop a proactive maintenance plan that keeps your building welcoming, safe, and in excellent condition.
