Expert Toilet Repairs in Northern Virginia
Need fast, reliable toilet repairs today? We fix running, leaking, and clogged toilets the right way. Our in-house, certified plumbers deliver upfront pricing and clear options. Serving Northern Virginia, including Fairfax, Alexandria, and Arlington. Backed by a 4.9 rating from 1,111 reviews. Call or book online for same-day service.
Why Choose Us
Certified in-house techs
Upfront, clear pricing
Same-day availability
Strong guarantees
Trusted locally
What Our Customers Say
professionalism
“Cardinal plumbing has been excellent addressing my concerns with an issue with our toilet.”
quality
“Jonathan was great to work with. Very efficient, knowledgeable, and pleasant.”
speed
“He quickly assessed the problem, provided options, and then was able to repair the toilet.”
A toilet usually leaks from the base when flushing because the seal between the toilet and the floor drain is no longer watertight. In most cases, the wax ring is compressed, worn, misaligned, or the toilet is rocking slightly, which lets wastewater escape around the base during a flush.
Common causes include a failed or misaligned wax ring, loose or corroded closet bolts, a damaged or low toilet flange, or a hairline crack in the porcelain base. If the leak only appears when the toilet is flushed, the floor seal or flange is more likely than the water supply line, but the toilet should still be inspected to confirm the source.
Stop using the toilet if water is leaking at the base, especially if the water appears dirty or smells like sewage. Continued flushing can damage flooring, subflooring, and nearby walls. Shut off the toilet’s water supply valve if needed, avoid flushing, and have the wax ring, flange, bolts, and toilet base inspected.
Updated: 2026-06-26
Need help in Herndon, VA? Call (703) 653-0701 or book online.
Yes, many homeowners can replace a toilet fill valve themselves, but take care because small mistakes can cause leaks or even crack the tank. Most DIY hiccups come from a stuck shutoff (angle-stop), mismatched parts, or over-tightening the plastic locknut on the valve. If the swap goes smoothly, a proper adjustment should stop a running toilet; if not, a deeper issue may be present. Our plumbers handle this job for homeowners around Annandale and can also address shutoff or supply-line problems tied to leaks. Same-day help is available.
Consider stopping DIY and calling a pro if you notice:
- The shutoff won’t close or the supply line looks corroded.
- Water still runs after replacement or the tank won’t refill correctly.
- Seepage at the tank bolts, fill-valve gasket, or any hairline tank crack.
- Recurring overflows or multiple fixtures gurgling, which can point to a main-line issue.
If you try it, shut off water at the toilet valve, drain the tank fully, and watch for drips for several minutes before leaving the room.
Updated: 2026-07-02
Need help in Annandale, VA? Call (703) 653-0701 or book online.
Still have questions?
Have questions or need service? Contact our team today to discuss your needs, request a quote, or schedule an appointment.