The City of Fairfax lists Fairfax Water as its water utility, and Fairfax Water's plant analyses show total hardness of roughly 70 to 185 mg/L from the Potomac and 77 to 147 mg/L from the Occoquan. In a city where the median home dates to the late 1960s, that scale often meets older pipes and water heaters. Call the number on this page to be connected with a local plumber in Fairfax.
The City of Fairfax and its water
Fairfax is an independent city surrounded by Fairfax County, and its water comes from Fairfax Water's Corbalis plant on the Potomac and Griffith plant on the Occoquan Reservoir. The median home in the city was built around 1967, earlier than most of the county around it, so many houses have had decades of moderately hard water running through their original copper and fixtures.
What to do now
- Get a reading. Use a hardness test strip at the kitchen tap and note grains per gallon.
- Check the main shutoff. In a house from the 1960s, an old gate valve may not close fully. It's worth knowing before any plumbing work starts.
- Inspect the water heater. Drain a little water from the valve at the bottom; white or tan flakes mean scale is already inside.
- Look at the old softener, if there is one. Note the brand, the age, and whether the brine tank holds standing water.
- Find a drain and outlet. A floor drain or laundry standpipe and an outlet near the main make the install simpler.
- Know your jurisdiction. Fairfax mailing addresses extend well past city limits. Check whether you're in the City or in unincorporated Fairfax County.
Symptoms and likely causes
| Symptom | Likely cause |
|---|---|
| Chalky crust on faucets and tub spouts | Hardness minerals left behind as water evaporates |
| Water heater popping | Scale layer on the tank bottom trapping steam bubbles |
| Softener running but water still hard | Spent resin, wrong setting or bypass left open |
| Salt bridge in brine tank | Humidity and too much salt packed at once |
| Pressure drop after install | Undersized unit or clogged prefilter |
Cost factors
The main cost drivers are unit capacity, whether the main needs new valves or a short reroute, and how far the regeneration line must run. Older homes may have galvanized sections or corroded fittings near the main that are smart to replace while the water is off. Adding a carbon stage for taste, or a drinking water filter, adds equipment. Inside city limits, plumbing permit applications go to the City's Code Administration; unincorporated Fairfax County addresses go to Fairfax County Land Development Services. Wastewater inside the city is handled by the City's Department of Public Works, which matters only if the discharge line needs a new drain connection.
Water Softeners & Filtration questions in Fairfax
Do I need a permit to put in a water softener?
Will a softener help my water heater or tankless unit last?
Does chloramine in city water wear out softener resin?
What hardness number should the softener be set to?
More plumbing services in Fairfax
Water Softeners & Filtration nearby
Helpful guides
Sources
- Fairfax County: utility and cable providers
- Fairfax Water: water quality
- Fairfax Water: Corbalis plant finished-water analyses
- Fairfax Water: Griffith plant finished-water analyses
- City of Fairfax: plumbing permit application
- City of Fairfax: wastewater services
- Fairfax County Land Development Services: permits in PLUS
- Housing by year built: Fairfax
Last updated: