Lorton is unincorporated southern Fairfax County, so commercial properties use Fairfax Water, Fairfax County sewer and Fairfax County Land Development Services. Both Fairfax Water's Griffith treatment plant and the County's main wastewater plant are in the area. Call the number on this page to be connected with a local plumber in Lorton.

About Lorton
Lorton runs along I-95 and Route 1 between Fort Belvoir and the Occoquan River. Most of its buildings are fairly new, with the 2000s the biggest building decade and only about 17% of homes in ZIP 22079 built before 1980. Retail, offices, contractor yards and light industrial space make up much of the commercial mix.
What to do now
- Turn off the water at the fixture or the building's main valve.
- Smell gas? Leave. Once outside, call 911 and Washington Gas at 844-WASHGAS (844-927-4427), option 1.
- Sewage backup? Call Fairfax County's Customer Communications Center at 703-323-1211, any hour, to have the County main checked. The private lateral is the owner's responsibility under County code.
- Main break in the street? Report it to Fairfax Water's after-hours line, 703-698-5613.
- Document it. Take photos and note the time, which helps with landlords and insurers.
- Call for a plumber and say whether the business needs to stay open.
Signs and likely causes
| Sign | Likely cause |
|---|---|
| Shop restroom keeps clogging | Partial blockage in the building drain or lateral |
| Irrigation backflow device spraying | Freeze damage or a failed relief valve |
| Pressure drop throughout the building | Failing regulator, closed valve or a leak underground |
| Hot water fades quickly | Scale or a failing element in the heater |
Lorton's water comes from Fairfax Water, which draws on the Occoquan Reservoir, treated at the Griffith plant near Lorton with ozone and granular activated carbon, and on the Potomac River at its Corbalis plant. Disinfection is chloramine most of the year and free chlorine roughly April through June, so a spring chlorine taste is normal. Wastewater goes to the County's Noman M. Cole, Jr. Water Recycling Facility. Testable backflow assemblies are tested at installation, after repair and at least yearly under the Fairfax Water and County program.
Cost factors
- Building size and number of fixtures
- Locating underground leaks across lots and yards
- Permits through Fairfax County LDS in PLUS
- After-hours scheduling
- Whether a backflow assembly passes on the first test or needs parts
- Water heater replacements, which Fairfax County permits even like-for-like
Fairfax Water's finished water is moderately hard to hard, so ask about flushing commercial water heaters while the plumber is on site.
Commercial Plumbing questions in Lorton
How often must a business's backflow assemblies be tested in this area?
How do we protect a building's pipes during a hard freeze?
How do we confirm which utility provides our building's water and sewer?
What should we have ready before the plumber arrives?
More plumbing services in Lorton
Commercial Plumbing nearby
Helpful guides
Sources
- Fairfax County: where drinking water comes from
- Fairfax County Wastewater Management
- Fairfax Water: water quality
- Fairfax Water annual water quality report
- Fairfax County LDS: cross connections and backflow prevention
- Fairfax County Land Development Services
- Fairfax County LDS: household appliance and plumbing permits
- Prince William Water: water treatment facilities
- Washington Gas: safety and the emergency leak line
- Lorton ZIP 22079 housing by year built
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