The City of Fairfax and the Fairfax-addressed suburbs around it are on Fairfax Water, so private well pumps are rare. With older housing, the usual culprits behind a pressure drop are regulators, valves and service lines, while some homes have sump, booster or irrigation pumps. Call the number on this page to be connected with a local plumber in Fairfax.
Fairfax at a glance
The City is a historic county seat with a median build year of 1967, one of the older housing stocks in the area. Fairfax Water is the water utility for the City and for the unincorporated Fairfax-addressed neighborhoods around it, drawing on the Potomac River and the Occoquan Reservoir. Inside city limits, the City's Department of Public Works handles sewers; outside, Fairfax County does.
What to do now
- Check faucets on more than one floor to see whether the problem is house-wide.
- Ask a neighbor whether their pressure is normal, which tells you whether to call the utility.
- Locate the main shutoff and make sure it is fully open; old gate valves sometimes close partly on their own.
- If there is a pump or tank, check the breaker and read the gauge without opening any covers.
- If water is surfacing in the yard or street, call Fairfax Water at 703-698-5800.
| Symptom | Likely cause |
|---|---|
| Pressure faded slowly over months | Worn regulator or a corroded old line |
| Sudden drop, neighbors also low | Utility main work or a break |
| Rusty water from cold taps | Aging pipe inside the house or a disturbed main |
| Pump cycles every few seconds | Pressure tank lost its air charge |
| Sump pump runs in dry weather | Stuck float or a leaking check valve |
Cost factors
- Replacing a regulator or valve compared with replacing a pump
- Locating and repairing a leak on the buried line
- Repiping, if original pipe inside the house is narrowing flow
- Permits: City Code Administration inside the limits, Fairfax County Land Development Services outside
Fairfax Water's hardness runs roughly 70 to 185 mg/L depending on the plant and season. In a house that has been on the same regulator for decades, that buildup alone can explain a lot. Some older homes around Old Town Fairfax can also have original galvanized pipe inside the walls, which narrows as it corrodes and lowers flow at every fixture. A plumber can tell the difference between a failing regulator and narrowed pipe with a pressure test at the main and a flow check at a faucet.
Well Pump Repair questions in Fairfax
My water bill comes from a utility. Can I still have a well pump problem?
Does replacing a well pump or pressure tank need a permit?
Why is there grit or cloudiness in my water all of a sudden?
Why does the pressure switch click on and off so often?
More plumbing services in Fairfax
Well Pump Repair nearby
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