Lorton is on Fairfax Water, whose Griffith plant on the Occoquan Reservoir sits near Lorton and reports total hardness of about 77 to 147 mg/L, roughly 4.5 to 8.6 grains per gallon. Water from the utility's Potomac plant can run harder. Call the number on this page to be connected with a local plumber in Lorton.

Lorton in brief
Lorton sits in southern Fairfax County between Fort Belvoir and the Occoquan River, and much of its housing is newer, with the 2000s the biggest building decade. Fairfax Water's Griffith plant, which treats Occoquan Reservoir water with ozone and granular activated carbon, is near Lorton at the southern end of the service area. The utility also runs the Corbalis plant on the Potomac, which reports 70 to 185 mg/L. Because the system is connected, a tap test is the honest way to know what's in your pipes.
What to do now
- Test the water. A strip at the kitchen tap gives grains per gallon. Retest after a few months.
- Look for scale. Check aerators, showerheads and the dishwasher for white deposits.
- Check a builder softener. Many homes from the 2000s came with one; confirm it's set to your actual hardness and actually regenerating.
- Clear space. Make room around the main, the water heater and a floor drain.
- Think about taste separately. Fairfax Water uses chloramines most of the year and free chlorine generally April through June; a softener won't change that.
Symptoms and likely causes
| Symptom | Likely cause |
|---|---|
| Soft water some days, hard on others | Unit set to a low default hardness, or capacity too small for the household |
| Brine tank overflowing | Float valve stuck or drain line blocked |
| Resin beads in faucet aerators | Broken distributor tube inside the tank |
| Salty taste after regeneration | Incomplete rinse cycle or low water pressure during regen |
| Valve clicking but not cycling | Worn motor or gears in the control head |
Cost factors
Resetting a unit or cleaning an injector is quick. Replacing a control valve, distributor tube or resin is a mid-size job, and a full replacement depends on capacity and whether the existing bypass and drain can be reused. Newer Lorton homes often have the plumbing in place, which keeps install costs down; finished basements can add access work. Lorton is unincorporated, so Fairfax County Land Development Services handles any permit for new or relocated piping. Lorton homes on county sewer send the softener's regeneration water down the same drain lines as the rest of the house, so the main requirement is a proper air gap at the drain.
Water Softeners & Filtration questions in Lorton
Why does my hardness reading change from season to season?
How do I turn mg/L or ppm into grains per gallon?
Is an old softener worth repairing?
How often does a softener need salt and service?
More plumbing services in Lorton
Water Softeners & Filtration nearby
Helpful guides
Sources
- Fairfax County: where drinking water comes from
- Fairfax Water: water quality
- Fairfax Water: Griffith plant finished-water analyses
- Fairfax Water: Corbalis plant finished-water analyses
- Prince William Water: water treatment facilities
- Fairfax County: wastewater management
- Fairfax County Land Development Services: permits in PLUS
- Lorton (Wikipedia)
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