Quick answer
A well pump foot valve is a one-way check valve with a built-in strainer screen, fitted to the bottom end of a suction pipe in a well, that lets water flow up to an above-ground pump and stops it from draining back down when the pump shuts off.
Holding that column of water is what keeps a shallow well jet pump primed. Without it, or with a leaking one, the pump has to re-prime and may run dry.
Quick facts
The key facts about Well Pump Foot Valve, with sources:
Key takeaways
- A foot valve sits at the bottom of a well suction pipe and keeps that pipe full of water when the pump stops.
- Shallow well jet pumps need it (or an in-line check valve) to hold their prime, says Alberta’s pump guide.
- A leaking or clogged foot valve shows up as a pump that loses prime, runs without building pressure, or cycles often.
- Submersible pumps work differently and do not use a suction foot valve.
- Replacing one means pulling the pipe from the well, then disinfecting the well afterward.
What a well pump foot valve is and why a jet pump needs one
Some wells have the pump down in the water. Others have the pump up top, in a pump house or basement, pulling water up a pipe by suction.
That second kind, a jet or centrifugal pump, cannot pull air. Its pipe and casing must be full of water, called being primed, before it can move anything.
A foot valve is what keeps that pipe full. It is a check valve, so water can only pass one way: up.
When the pump shuts off, the valve closes and holds the water column in place.
Flomatic, a valve maker, says its foot valve body is built to make sure the pump does not lose its prime between stops and starts 3.
The “foot” part is the screen. A strainer around the valve keeps sand, gravel and debris out of the valve and the pump. Flomatic describes the screen as a filter for large particles, with a finer filter possible after the pump 3. That screen is also the part that clogs.
Foot valve vs. in-line check valve
Both are one-way valves. A foot valve goes at the very bottom of the suction pipe, in the water, with a screen. An in-line check valve sits in the pipe above ground or near the well head.
Goulds notes you can use an in-line check valve near the well head and the well casing as the suction pipe, and that the closer it is to the well, the easier the system primes 1.
What happens at the foot valve during one pump cycle
- Pressure drops in the house. A faucet opens, the pressure tank falls to its cut-in point, and the pump starts.
- Suction lifts the poppet. The pump lowers pressure in the suction pipe. Water pushes the spring-loaded poppet open and flows up through the screen 3.
- Water rises to the pump. Total lift is the vertical distance from the water to the pump plus friction in the pipe and the foot valve 2.
- The pump stops. Once the tank reaches cut-out pressure, the motor shuts off.
- The valve snaps shut. The water column tries to fall back; the poppet closes and holds it, so the next start begins primed 3.
- Pump startsTank pressure has dropped
- Poppet opensSuction pulls water through the screen
- Water liftsUp the suction pipe to the pump
- Pump stopsTank is back to cut-out
- Poppet closesPipe stays full; prime is held
- Back to step 1
If the poppet leaks, water drains back between cycles and the pump must re-prime. Source: [3] [2]
Which foot valve setups exist and where each fits
| Type | How it closes | Where you see it | Notes |
|---|---|---|---|
| Spring-loaded poppet | Spring pushes a disc onto its seat | Most home well and pump suction lines 3 | Flomatic installs it vertical, arrow up 3 |
| Foot valve on a jet assembly | Threads onto the bottom port of a deep-well jet | Two-pipe deep well jet systems 1 | Can also go on a tail pipe below the jet 1 |
| Foot valve with tail pipe | Same valve, set lower on extra pipe | Weak wells where the water level drops 4 | Lets the intake reach lower water |
| In-line horizontal check (instead) | Swing or spring check in a level pipe | Driven wells where the casing is the suction pipe 4 | No screen at the bottom |
| Built-in jet check | Check is part of the ejector | Some deep-well jets 4 | A foot valve is needed only if the jet lacks one 4 |
Example: will a shallow well jet pump reach this water?
Suction has a hard ceiling. Two sources set it differently, so this example checks a well against both. All lift numbers include friction in the suction pipe and foot valve, not only the vertical height 21.
| Check | This well | Goulds sheet (25 ft max) | Alberta guide (under 18 ft) |
|---|---|---|---|
| Water level while pumping | 14 ft below the pump | ||
| Friction in pipe and foot valve (from the pump maker’s chart) | 3 ft | ||
| Total suction lift | 17 ft | Within limit 1 | Just inside the practical range 2 |
| Same well in a dry summer: water drops 6 ft | 23 ft | Still within limit 1 | Past the practical range; output falls 2 |
Total lift (ft) = vertical distance from pumping water level to pump + friction loss in suction pipe and foot valve
Pumping water level- Where the water sits while the pump runs, not when it rests
Friction loss- From pipe length, size, fittings and the foot valve
Alberta’s definition; Goulds also counts friction inside its 25 ft limit 21.
The well depths here are an illustration, not measurements from a real home.
The point is the arithmetic: if the dry-season water level plus friction tops 25 feet, a shallow well jet pump will not lift it at all by one maker’s rule, and Alberta’s guide says efficiency is already falling past 18 feet.
The fixes are a deep well jet with the ejector in the water, or a submersible pump.
Pipe size matters too: Goulds says a suction pipe smaller than the pump suction (typically 1¼ inch) adds friction and raises the effective lift 1.
Where the foot valve sits in a well system
If your pump sits above ground and has one pipe going into a shallow well, the foot valve is on the bottom of that pipe, down in the water.
Goulds tells installers to fit it on the end of the drop pipe when the well is 2 inches or larger and to keep it at least 5 feet off the bottom so it does not pull in debris 1.
If you have a two-pipe deep well jet system, the foot valve is usually threaded onto the bottom of the jet assembly or on a tail pipe below it 1. A small driven well may have no foot valve at all, just an in-line check valve near the pump 4.
You cannot see it without pulling the pipe. On a well report or service invoice it may be listed with the suction pipe, the jet, or as “foot valve and strainer.”
A quick tell: a jet pump sits above ground with pipe running down into the well, while a submersible has only an electrical cable and a drop pipe at the well cap.
The cross-section below shows a single-pipe shallow well from the pump down, with the two clearances the makers set: the frost-line turn near the top and 5 feet of clearance at the bottom.
- Jet pumpAbove ground, in a pump house or basement
- Frost-line turnPitless adapter or well seal and elbow, below frost 1
- Suction pipeSloped up to the pump, no high points 2
- Pumping water levelWhere water sits while the pump runs 2
- Foot valve and screenVertical, arrow up 3
- At least 5 ft of clearanceKeeps debris off the screen 1
- Well bottomSand and silt settle here
What a foot valve does well and where it falls short
What it does well
Where it falls short
- It sits at the bottom of the well, so any repair means pulling pipe.
- The screen clogs in sandy or silty water, cutting flow 4.
- A worn seat or stuck poppet lets water drain back and the pump loses prime 4.
- It adds friction, which counts against the suction lift limit 2.
- Sudden closing can contribute to water hammer in the riser pipe 3.
What a foot valve cannot fix
It cannot make suction work past its limit. Water can only be pulled up so far. Goulds caps total suction lift at 25 feet, and Alberta’s guide says shallow well jet pumps are practical only below 18 feet of total lift 12. A perfect foot valve does not change that.
It cannot stop air leaks above it. Air sneaking into the suction pipe at a loose joint or the well seal also breaks the prime.
The National jet pump manual describes pressurizing the suction side to about 30 psi with a bicycle pump or compressor: if it will not hold, there is a suction-side leak to find, which is a different fault from a bad foot valve 4.
It is not water treatment. The screen catches gravel and large grit. Fine sand, iron or bacteria need a cartridge filter or other treatment after the pump.
What drives the cost of foot valve work
We do not list prices; fair numbers need dated local quotes.
The valve itself is a small part. The labor is in pulling the pipe.
Cost drivers are well depth and how much pipe has to come up, whether the pipe is steel or plastic and in what shape, whether the jet assembly comes up too, whether the suction pipe needs replacing, whether the pump needs repair after running dry, and disinfecting the well afterward.
Penn State Extension recommends shock chlorination after working on an existing well 5.
Lifespan depends on water quality and sizing. Flomatic says its foot valves give years of trouble-free operation when properly installed and sized, and warns that flow below 2 feet per second can wear the poppet parts early 3.
No neutral source gives a fixed life in years. See our plumbing cost guide for how quotes are built.
How a foot valve is replaced, step by step
This is a well contractor or plumber job in most homes: it involves electricity, a sanitary well opening and heavy pipe. Some states license pump installers separately. The sequence below follows maker instructions.
- Shut off and lock out power. Goulds warns hazardous voltage can kill and says to disconnect and lock out power before working on pumps 1.
- Open the well and pull the pipe. The suction pipe, and any jet assembly, comes up with the foot valve on its end 4.
- Inspect. Check the screen for clogging and the poppet for free movement; the National manual says partial clogging reduces delivery and a defective valve causes prime loss 4.
- Fit the new valve vertical, arrow up. Flomatic sizes it to the flow, not just the pipe, and keeps the screen off the well bottom 3.
- Lower the pipe and fill it. The National manual says to fill each pipe with water as it is lowered 4.
- Prime the pump. Pour water into the pump until full; Alberta describes running until air stops bubbling out, then refilling, until water flows steadily 2.
- Disinfect the well. Shock chlorinate after work on the well 5, then test the water.
How to keep a foot valve working longer
- Make sure a new well is pumped clean of sand before the valve goes in; both the National manual and Flomatic say so 43.
- Keep the intake at least 5 feet off the well bottom, per Goulds, to avoid pulling in debris 1.
- Watch the pressure gauge. A pump that takes longer to build pressure than it used to is an early sign of a clogging screen.
- Keep suction piping sloped upward from the well to the pump with no high points; air locks can form at a hump 2.
- Test the water after any pump work; private well owners are responsible for their own water safety 6.
Note the prime time
After any service, write down how long the pump takes to build pressure from a full stop. If that time creeps up over months, have the foot valve and suction line checked before the pump starts running dry.
Which signs point to a failing foot valve
- The pump runs but delivers little or no water, especially after sitting idle 4.
- You have to re-prime the pump again and again 4.
- The pressure gauge drops slowly overnight with no water in use, then the pump short-runs.
- Water flow comes in spurts with air in it.
- Sand or gravel in fixtures, which can mean a damaged screen.
Two hazards: power and the well itself
Shut off and lock out power before touching a pump or pressure switch; Goulds warns hazardous voltage can shock, burn or kill 1. Never run a pump dry, which damages it 1.
Opening a well lets contamination in, so cap it promptly and shock chlorinate after work 5. Do not climb into a well pit or dug well.
These signs overlap with suction-side air leaks and a falling water table. A well contractor or plumber can test the suction side with pressure before pulling pipe. If you have no water at all, our plumbing emergency tool walks through what to check first.
Which rules apply to foot valves and well work
Federal: U.S. EPA does not regulate private domestic well water under the Safe Drinking Water Act; the owner is responsible for safe water 6. There is no federal foot valve rule.
State well codes: states set well construction and pump installation rules, including well caps, pitless adapters and who may install pumps. These vary widely; check your state health or environmental agency.
Plumbing codes: the plumbing code typically picks up at the pressure tank and building supply. Local adoption varies, so ask your building department where its rules start.
Manufacturer instructions: Goulds (IM457 Rev 2, 2025) gives the 25-foot suction lift limit and foot valve placement; Flomatic’s O&M sheet gives vertical installation and flow sizing 13. Following them keeps the warranty valid; Flomatic says not following them may void it 3.
How a foot valve compares with check valves, tanks and filters
| Part | Location | Job | Key difference |
|---|---|---|---|
| Foot valve | Bottom of the suction pipe, in the water | Holds prime, screens debris 3 | Only on suction (above-ground) pumps |
| In-line check valve | In-line, at the well head or pump | Stops backflow in the pipe 1 | No intake screen |
| Well pressure tank | Next to the pump | Stores water under pressure | Controls cycling, not prime |
| Submersible pump check | At or above a pump that sits in the water | Holds water in the drop pipe | Pump pushes, so there is no suction to lose |
| Sediment filter | After the pump, before the house | Removes finer particles | Protects fixtures, not the pump |
What people get wrong about foot valves
- Myth A better foot valve lets a shallow well pump draw from deeper water.
- Reality Suction has a limit no valve changes: 25 feet of total lift for Goulds, and under 18 feet for practical use per Alberta 12.
- Myth Losing prime always means the foot valve failed.
- Reality Air leaks on the suction side cause the same symptom; the National manual tests for them separately 4.
- Myth Every well pump has a foot valve.
- Reality Submersible pumps and some jets with built-in checks do not need one 4.
- Myth The foot valve should rest on the bottom of the well.
- Reality Goulds keeps the intake at least 5 feet off the bottom and Flomatic says the screen should not be supported on the bottom 13.
- Myth Any check valve position works.
- Reality Flomatic installs foot valves vertical with the arrow up; warranty may be void otherwise 3.
How climate and your water table change the foot valve’s job
Two local factors decide how hard a foot valve works. The first is the water table: in dry seasons or drought, the pumping water level drops, and total suction lift grows until a shallow well pump can no longer reach it 2.
The second is freezing: Goulds tells installers in cold areas to make the turn from vertical to horizontal pipe below the frost line, using a pitless adapter or a well seal and elbow 1. Sandy aquifers also clog screens faster.
EPA estimates over 43 million people in the U.S. rely on private wells, so these limits affect a large share of rural homes 6.
When the foot valve matters to you and who to call
It matters if you have an above-ground jet pump and it keeps losing prime, if output has dropped, or if you are buying a home with a shallow well and want to know whether the pump suits the water level.
Your next step is to note the symptoms and how often they happen, then call a well contractor or plumber to test the suction side.
If the water level is near the suction limit, ask whether a deep well jet or submersible pump is the better long-term fix. Our guide to choosing a plumber covers what to ask.
- If Pump loses prime after sitting idle
- Then Foot valve leak or suction-side air leak; test before pulling pipe 4
- If You have a submersible pump
- Then No suction foot valve; look at the pump’s check valve and tank
Questions about Well Pump Foot Valve
How long does a well foot valve last?
No neutral source sets a fixed life in years; it depends on sand, water chemistry and sizing.
Flomatic says its foot valves give years of trouble-free service when installed and sized correctly, and warns that flow below 2 feet per second can wear the poppet early.
Sandy wells clog screens faster, so a rising time to build pressure is the practical signal to have it checked.
How do I know if my foot valve is bad?
The usual signs are a pump that loses prime, runs without building pressure, or delivers less water than it used to.
The National jet pump manual lists a defective or plugged foot valve as a cause of little or no delivery.
Air leaks on the suction side cause similar signs, so have the line tested before the pipe is pulled.
Do I need a foot valve for a shallow well pump?
Yes, or an in-line check valve. Alberta’s shallow well pump guide says the suction line must have either a check valve or a foot valve to keep the prime. Goulds says to fit a foot valve on the drop pipe when the well is 2 inches or larger.
Does a submersible pump need a foot valve?
No. A submersible pump sits in the water and pushes it up, so there is no suction pipe to keep primed. Submersible systems use check valves in the drop pipe to hold water and prevent backspin, but not a suction foot valve with a strainer.
How deep can a shallow well jet pump pull water?
Goulds limits total suction lift to 25 feet, including friction in the suction pipe. Alberta’s guide is more cautious and says shallow well jet pumps are practical only for total lifts under 18 feet. Altitude and long or small pipes reduce what you can actually reach.
Where should the foot valve sit in the well?
Below the lowest pumping water level and off the bottom. Goulds says to keep the drop pipe at least 5 feet off the bottom to avoid pulling in debris. Flomatic says the screen should not rest on the bottom and should sit vertical with the arrow pointing up.
Why does my well pump lose prime overnight?
Water is draining back down the suction pipe while the pump is off. The two common causes are a leaking foot valve and an air leak in the suction piping or fittings. A plumber can pressurize the suction side; if it holds, the foot valve is the likely culprit.
Can I replace a foot valve myself?
It is possible but is usually a well contractor’s job. It means shutting off and locking out power, pulling the pipe out of the well, fitting the valve, re-priming the pump and disinfecting the well. Penn State Extension recommends shock chlorination after working on an existing well.
What is the difference between a foot valve and a check valve?
A foot valve is a check valve with a strainer, mounted at the bottom of the suction pipe in the water. A plain check valve sits in-line elsewhere, often near the pump or well head, with no screen. Both let water move one way only.
Sources
- Goulds Water Technology (Xylem), Jet Pumps Quick Guide IM457 Rev 2 (2025; single manufacturer), retrieved .
- Alberta Agriculture, Shallow Well Jet Pumps (Agdex FS716(C12), reviewed 2016), retrieved .
- Flomatic Corporation, Foot Valves Installation Instructions, O&M Foot Rev. B (single manufacturer), retrieved .
- Jet Pump Installation Manual, National brand (single manufacturer; InspectAPedia archive copy), retrieved .
- Penn State Extension, Shock Chlorination of Wells and Springs (Swistock, Clemens, Sharpe; updated May 29, 2025), retrieved .
- U.S. EPA, Private Drinking Water Wells, retrieved .
Expert review
Written by the HyrePlumber Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Suction lift limits come from two sources that disagree (Goulds IM457: 25 ft; Alberta Agriculture: practical under 18 ft) and both are shown; the Alberta limit, foot-or-check-valve rule, total-lift definition and priming steps were re-read on 2026-10-13.
Valve placement and sizing come from Goulds and Flomatic manuals, labeled as single-maker sources; troubleshooting from a National jet pump manual. Disinfection after well work is Penn State Extension. The lift example uses illustrative depths, labeled as such. No prices are given.
Suggest a correction. We fix errors and say what changed.