Why Is My Well Water Pressure Low?
Quick Answer
Low well water pressure is usually caused by a waterlogged pressure tank, failing pump, or faulty pressure switch — most fixable in one service call.
Weak pressure from a private well is frustrating, but it’s almost always fixable. The key is identifying which component has failed — the fix and cost are very different depending on the cause.
The Most Common Causes
1. Waterlogged Pressure Tank
The pressure tank holds a reserve of pressurized water using an internal bladder (or diaphragm) backed by an air charge. When the bladder fails, water fills the entire tank and eliminates the air cushion. The pump has to run almost continuously to maintain any pressure, and you’ll notice:
- Pump cycling on and off every few seconds
- Pressure dropping quickly when a faucet is opened
- Pressure gauge bouncing rapidly
Tap the tank: a healthy tank sounds hollow in the upper portion. A failed one sounds solid all the way up. Bladder replacement runs $300–$700 for parts and labor; full tank replacement is $400–$900 installed.
2. Faulty Pressure Switch
The pressure switch (the gray square box mounted near the tank) tells the pump when to run. A worn contact inside the switch can prevent the pump from starting at all, or can cause it to start and stop erratically. The switch itself is inexpensive ($20–$40), and replacement is a one-hour job for a licensed contractor.
3. Pump Wear
A pump delivers a rated flow rate (gallons per minute) when it’s new. As a pump ages — particularly in wells with high iron or mineral content like those in Parker, Hood, and Erath counties — impellers wear and output drops. You’ll still get water, just not enough of it. A flow test during a service call can confirm whether the pump is delivering its rated GPM.
4. Drop in Water Table
During extended drought conditions, aquifer levels in North Texas can drop significantly. If your pump intake is above the current water level, it pulls air — producing sputtering and eventual loss of flow. This is more common in late summer after dry years and in wells with higher static water levels (shallower). A driller can measure your current water level and lower the pump if there’s room.
5. Blocked Drop Pipe or Foot Valve
Sand, mineral scale, and corrosion can partially block the pipe that carries water from the pump to the surface. A foot valve (check valve at the bottom of the drop pipe) can also clog with sediment. Both restrict flow and look like low pressure at the house.
6. Leak in the Supply Line
A significant leak between the pump and the house bleeds pressure before it arrives. Check for wet spots in the yard, around the wellhead, and at pipe fittings near the pressure tank.
Quick Diagnostic Steps
- Check the pressure gauge — is it cycling rapidly, holding low, or dead zero?
- Tap the pressure tank — hollow at top = healthy air charge; solid = waterlogged
- Listen for pump behavior — short-cycling (every few seconds) points to the tank; never starting points to the switch or pump motor
- Watch for sputtering — air in the water often means a low water table or cracked drop pipe
When to Call a Contractor
If the pressure tank test and pressure switch reset don’t resolve it, the pump needs to be pulled and inspected — that requires a licensed TDLR-certified contractor. Pulling and reinstalling a submersible pump runs $1,200–$4,500 depending on depth.
We carry replacement tanks and pumps in stock across our 19-county North Texas service area. Most pressure-related issues can be resolved in a single visit.