Plumber in Herndon, VA
From Historic Downtown Herndon and the W&OD Trail to the subdivisions toward Dulles, we help Herndon homeowners in 20170 and 20171 with leaks and plumbing repair.
- ZIP 20170, 20171
- Town of Herndon & nearby
- Open 24/7
Herndon is an incorporated town in western Fairfax County, between Reston and Washington Dulles International Airport. Its historic downtown grew up around the railroad that is now the W&OD Trail, and the old depot still stands near the town green. Beyond downtown, most neighborhoods are single-family homes and townhomes built from the 1970s through the 1990s, with newer communities closer to the airport and the Silver Line. We serve Herndon with the same team that answers calls for our plumber in McLean customers.
Why plumbing in Herndon is different
Herndon's fastest growth came in the decades when polybutylene pipe was in use, so it is worth checking older homes for it. Many townhomes are slab-on-grade, which means hot-water leaks under the floor show up as warm spots, damp flooring or a meter that never stops. Original water heaters, shutoff valves and fixtures from the 1980s and 1990s are reaching the end of their service life.
Fairfax Water supplies drinking water to the Town of Herndon. Homes just outside town limits are typically Fairfax Water customers too.
Common plumbing problems in Herndon
| Problem | Where it shows up | What helps |
|---|---|---|
| Warm spot or damp slab floor | Townhome first floors | Slab leak repair |
| Gray polybutylene pipe | Utility rooms, crawl spaces | Repiping |
| Water heater leaking | Garage, basement or closet | Water heater repair |
| Rising bill, no visible leak | Anywhere | Leak detection |
| Running toilets and drips | Bathrooms | Toilet, faucet & shower repair |
| Slow or backed-up drains | Kitchens, basements | Drain cleaning |
| Burst pipe after a freeze | Garages and outside walls | Emergency plumber |
Tips for Herndon homeowners
- Read your meter monthly. It is the easiest way to catch a slab leak early.
- Check exposed pipe for polybutylene near the water heater and main valve.
- Drain garage and outdoor lines before hard freezes.
- Plan your water heater replacement before it fails, especially if it sits in a garage or closet above finished space.
- Keep the area around the water heater clear so leaks are easy to spot.
Replacing a water heater in Herndon
Water heater replacement is one of the most common jobs in homes of Herndon's age. Fairfax County requires a permit for gas water heater replacement, even when the new heater matches the old one. Switching to a tankless unit can also mean gas line, venting or electrical changes. We walk you through the options and the permit steps.
Newer neighborhoods near Dulles and the Silver Line
Homes and townhomes built more recently near the airport and the Herndon and Innovation Center Metro stations usually have PEX supply lines and newer fixtures. Their common problems are different: loose push-fit or crimp fittings, washer and dishwasher hoses, water heaters in closets above living space and slow leaks at shower valves. Leaks in these homes tend to show up as stains on first-floor ceilings. Know where your main shutoff is, add a pan and leak sensor under upstairs water heaters and washers, and check the meter if your bill climbs.
Herndon plumbing questions
Do you cover all of Herndon?
Yes. We serve the Town of Herndon and the Fairfax County areas with Herndon addresses in ZIP codes 20170 and 20171, from Historic Downtown Herndon to the neighborhoods near the Herndon and Innovation Center Metro stations.
Who supplies water in Herndon?
Fairfax Water provides drinking water to the Town of Herndon. Meter or street questions go to the utility. Leaks on your side of the meter and inside the home are private repairs we handle.
Does my 1980s Herndon home have polybutylene pipe?
It might. Polybutylene was used in many homes built from the late 1970s to the mid-1990s. Gray plastic supply pipe, often stamped PB, is the sign to look for.
Why is my townhome floor warm in one spot?
A warm spot on a slab floor often means a hot-water line leaking under the concrete. Turn off the water heater supply if you can and call; we locate slab leaks without breaking up the floor to search.
How old is too old for a water heater?
There is no single number. Rust in the hot water, popping noises, leaks at the tank and a heater older than the manufacturer's warranty are all reasons to plan a replacement before it fails.
Sources
- Tysons Reporter — Vienna water service and Fairfax Water (Jan. 2, 2024)
- Fairfax County Land Development Services — Household Appliance Permit
Last reviewed 2026-11-07. This page is general information, not legal or insurance advice. Read how we research and check pages in our editorial policy.
Plumbing services in Herndon
Leak Detection
Find hidden leaks in walls, ceilings, floors and yards without tearing the house apart.
Slab Leak Repair
Locate and fix leaks under basement and slab floors with spot repair or a reroute.
Water Line Repair
Repair or replace the buried line between the meter and your house.
Emergency Plumber
Burst pipes, flooding and no-water calls answered around the clock.
Water Heater Repair
Repair, replace or upgrade tank and tankless water heaters.
Drain Cleaning
Clear slow and clogged sink, tub, floor and main drains.
Sewer Line Repair
Camera inspection, root removal and repair of the main sewer line.
Repiping
Fix pinhole leaks and replace old copper, galvanized or polybutylene pipe.
Sump Pump Repair
Repair, replace and back up the pump that keeps your basement dry.
Well Pump Repair
Restore water to homes on private wells, from pressure tank to pump.
Toilet, Faucet & Shower Repair
Stop running toilets, dripping faucets and leaking shower pans.
Pool Leak Detection
Find where a pool or spa is losing water, then fix the plumbing side.
Nearby areas we cover
Need a plumber in Herndon? Call now.
Call McLean Plumber Works any time, day or night. A plumber picks up and talks you through next steps.