Reston · Fairfax County
Emergency Plumber in Reston, VA: Condo Permits, Gas Heaters and Sewer Backups
Reston is in Fairfax County, not Loudoun, and almost every rule that applies in Ashburn changes at the county line. The permit desk is different, the sewer number is different, and a second body, Reston Association, sits beside the county for exterior work.
Most of this page is about which of those applies to your address.
Fairfax County rules, not the Loudoun ones
Reston is an unincorporated community inside Fairfax County. Nothing about the Loudoun County permit route, its Building and Development office or its utility carries across.
| Loudoun County (Ashburn) | Fairfax County (Reston) | |
|---|---|---|
| Permit office | Building and Development, Leesburg | Land Development Services, Fairfax |
| Sewer backup line | Loudoun Water | County line, 703-323-1211 |
| Extra approval | Community association, where there is one | Reston Association for most exterior work |
The statewide building code is the same on both sides of the line. The desk that applies it is the thing that changes.
Why a condo or apartment uses the commercial permit route
Fairfax County's Land Development Services treats residential permits as applying to a detached one or two family home or a townhouse. Its page adds that some residential properties, such as apartment buildings and condos, are considered commercial.
In Reston, where condominiums and high-rise buildings sit close to townhouse clusters, that distinction matters. A condo unit is not quoted or permitted the way a single-family house is.
Before anyone quotes a condo or apartment job
- Confirm with the county which route applies to the building
- Ask the condominium association what it requires for work inside a unit
- Ask whether the shutoff for your unit is shared with a neighbor
- Ask the plumber who will pull the permit and who will be on site
A water heater installation in a unit often depends on these answers more than on the heater itself.
A gas water heater swap needs a permit even like-for-like
Fairfax County's Household Appliance permit page states that any gas appliance installation or replacement, such as a water heater, furnace or boiler, requires a permit, even if it is a like-for-like replacement.
The permit is applied for online, issued on payment, and followed by one inspection. The Land Development Services office can be reached at 703-222-0801. New gas piping falls under a plumbing permit instead.
What the county page does not say
The page does not address electric water heaters, so we make no claim either way. Ask the county, and ask your plumber to tell you which permit applies to your unit before the old one comes out.
A homeowner can reasonably ask a plumber to name the permit number once it is pulled. Repairing the existing heater is the other route, and it often avoids the question altogether.
Reston Association approval is a separate step
Reston Association requires approval for most exterior alterations, additions and redevelopments to a property. That is separate from the county permit, and each has to be satisfied on its own.
The pages we read do not name plumbing specifically, so we cannot say which jobs are covered. The sensible practice is to ask the association, or your cluster, before work that changes how the outside looks: a new outdoor connection, an exterior vent, or a trench through a lawn or past a tree for a sewer repair.
Interior repairs are not shown as covered. A burst supply line in a wall is an emergency to fix first, with approvals for anything visible from outside handled afterward. Repairing a burst pipe explains what comes first.
Lake Anne review board: interior plumbing is not reviewed
The county treats the Lake Anne Village Center as a historic overlay district. Its Architectural Review Board reviews work only where a permit is required, and its guidelines list interior alterations among the projects that do not need that review.
So interior plumbing at Lake Anne is not reviewed by the board. Exterior work that needs a county permit, such as a new exterior stair or an addition, is. A plumber doing a repair inside should not be waiting on that board.
The county labels the current guidelines document a final draft, so the details may change. Check with the county's review board office before planning any exterior work in the district.
A sewer backup in Reston: the county line comes first
Fairfax County says the resident or building owner is responsible for blockages and damage in the service line, which runs from the house to the county sewer and includes the connection to it. The county owns the public sewer in the street or easement.
It also asks residents to call the county before calling a plumber. The county's 24-hour line is 703-323-1211, and if the main is clear the problem is on your side.
What a lateral repair needs
- A county plumbing permit before any repair on private property
- A plumber who is certified, licensed and bonded, as the county's own brochure states
- A state permit as well when the work reaches into the public street
- An inspection once the repair is done
A camera run decides whether the fault is a section or the whole run. Sewer line repair explains how that decision is made.
What 82 to 167 mg/L of hardness means for a tank heater
Fairfax Water's monthly laboratory report for the 2024 distribution site that represents the Corbalis plant shows total hardness between 82 and 167 milligrams per liter. By our arithmetic, at about 17.1 milligrams per liter per grain, that is roughly 4.8 to 9.8 grains per gallon.
Fairfax Water says residences in the north end of the county generally receive water from the Corbalis plant. The pages we read do not name Reston, so read your own bill to confirm who supplies you.
In practical terms, this is moderately hard to hard water. Scale builds on tank heater elements and in the bottom of the tank over the years, which is why an annual drain and an anode check are worth doing.
Reston house ages by cluster, from Lake Anne in the 1960s
Virginia's historic resources record says the Lake Anne Village Center, the first village of the planned community, was constructed between 1963 and 1967. Reston has been added to ever since, so the age of a house depends on its cluster.
That means a Reston address does not tell you the pipe. A unit near Lake Anne can be sixty years old while one a few miles away is far newer, and older buildings are the ones where a camera inspection of the drain line earns its cost.
The ZIP codes for the community are 20190, 20191 and 20194. This page describes the place only. It does not say your address is within the area our dispatch network covers, and a dispatcher will confirm that when you call.
Reston relative to Ashburn and Herndon
Reston is about 9.4 miles from central Ashburn and lies in Fairfax County, not Loudoun. Look at where your street sits on the map before you call, since Fairfax County rules and not Loudoun's apply to the work.
Reston plumbing questions
Is a condo unit in Reston permitted the same way as a house?
Not necessarily. Fairfax County's Land Development Services says residential permits cover detached one or two family homes and townhouses, and that apartment buildings and condos are considered commercial.
Before a plumber quotes work in a unit, ask the county which route applies and ask the condominium association what it requires inside a unit.
Do I need a permit to replace a gas water heater in Reston?
Yes. The county says any gas water heater installation or replacement needs a permit, even when the new unit is the same as the old one. The permit is applied for online and one inspection follows.
The county page does not say anything about electric water heaters, so we make no claim about them. Call Land Development Services at 703-222-0801 to confirm.
Does Reston Association have to approve plumbing work?
The association requires approval for most exterior alterations, and that approval is separate from the county permit. The pages we read do not name plumbing, so ask the association before any change that shows on the outside.
Examples are a new outdoor connection, an exterior vent, or a trench through a lawn for a sewer repair. A repair inside the home is not described as covered.
Who fixes a sewer backup in Reston, the county or me?
Both, in order. Call the county's 24-hour line, 703-323-1211, so the public sewer is checked. If the main is clear, the service line from the house to the sewer is the owner's responsibility.
A repair on private property needs a county plumbing permit and a plumber who is certified, licensed and bonded. Work in the public street needs a state permit as well.
Is interior plumbing at Lake Anne reviewed by the county's review board?
No. The board reviews work only when a permit is required, and the guidelines list interior alterations among the projects that do not need its review.
Exterior work that needs a county permit, such as an addition or new exterior stairs, does. The county labels the current guidelines a final draft, so check the details with its review board office before planning exterior work.
How hard is the water in Reston?
Fairfax Water's monthly report for a 2024 distribution site representing the Corbalis plant shows total hardness from 82 to 167 milligrams per liter, which is roughly 4.8 to 9.8 grains per gallon by our own conversion.
That is one monitoring site, and the pages we read do not name Reston, so treat it as a guide. Your bill shows who supplies you, and an annual drain of a tank heater helps wherever the water is hard.
Plumbing trouble in Reston?
Say whether you own a detached house, a townhouse or a condo unit, because in Reston that one answer changes which permit route and which approvals apply before anyone starts work.