Well Water System Maintenance Checklist
A good well can serve for generations. A neglected one fails quietly from a loose cap, a corroded casing or a year nobody tested. This is the care that keeps both yield and safety.
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Seal and inspect the wellhead
Nearly every preventable contamination starts at the top of the casing.
- COREA sound, tight sanitary cap or well seal on top of the casing Amazon
- COREA intact surface seal and concrete apron sloping away from the casing Amazon
- Casing inspected for corrosion, cracks and a secure above-ground section Amazon
- Grounds kept clear of chemicals, fuel stores, and drains within the setback Amazon
Test the water every year
A private well is only as safe as the last honest test.
- COREAn annual laboratory sample for total coliform and E. coli bacteria Amazon
- CORENitrate testing, especially where septic systems or fertiliser are nearby Amazon
- A metals and hardness panel for iron, manganese, lead and arsenic Amazon
- A simple conductivity or TDS reading kept as a yearly trend line Amazon
Check pump and yield
The well's flow rate is its vital sign; measure it once a year.
- COREA recovery or yield test timing litres per minute from a drawn-down well Amazon
- The standing water level noted so a falling table is visible over years Amazon
- Pump cut-in and cut-out pressures logged against the original duty Amazon
- COREWatch for sand or grit in the water as a screen or lining warning Amazon
Pressure tank and controls at the well
The pressure set the pump to run is the part between the well and the house.
- COREPressure tank pre-charge checked with the tank drained, air just below cut-in Amazon
- Bladder condition confirmed: a waterlogged tank thuds and short-cycles the pump Amazon
- Pressure switch and its cut settings verified against the log Amazon
- COREAny low-level or dry-run cut-out tested so the pump cannot run a dry well Amazon
Power and wiring at the wellhead
The most dangerous, least-looked-at part of a well is the electrical connection.
Check valve and sediment
The check valve protects the prime; sediment tells you what the well is doing.
- COREPump-short-cycle or backspin symptoms checked as an early check-valve fault Amazon
- A rising sand or silt load logged as a possible screen or falling-table sign Amazon
- Sediment from the pressure tank drained off on a schedule Amazon
- COREA drop in clear-water pressure investigated rather than ignored Amazon
Respond to events and keep records
Some years the well needs more than routine. Plan the response.
- COREShock chlorination after any flood, opening, or bacterial test result Amazon
- COREA re-test for bacteria 1 to 2 weeks after any chlorination or repair Amazon
- A well file with construction depth, casing, yield and every test result Amazon
- A vetted local well contractor on file for pumps, casing and rehabilitation Amazon
A private well is water infrastructure you own outright, and that includes every way it can fail. There is no utility testing your output, no crew inspecting your casing, no guaranteed pressure. The household that tends its well for a few hours each year runs clean and reliably for decades. The one that forgets it discovers the problem through a taste, a illness or a dry tap.
The failure modes of a well are specific. Contamination usually enters from above, through a loose sanitary cap, a cracked surface seal or a flood that pushes dirty water down the casing. Yield fades as the water table drops or the screen fouls. The pump, pressure tank and the electrical connection at the wellhead each age on their own clocks.
Good maintenance is therefore a short annual rhythm plus a response to events. Inspect and seal the wellhead. Test the water. Measure the yield and pressure. Check the power and the check valve. Shock-chlorinate after any flood, work or bad result, and keep records so next year's check compares against this one.
This checklist runs the well-specific routine: wellhead and cap, annual water testing, pump and yield, pressure and controls, power at the wellhead, the check valve and sediment, and event response with chlorination and records. For the pump hardware itself see our water pump maintenance checklist. Every buyable line links to current options on Amazon.com, and Spare Theory may earn a commission on those links. We never set or verify Amazon's prices.
At a glance
- Most well contamination enters from above, through a loose cap, a cracked surface seal or a flood that backs down the casing.
- A well's yield is a health check. A falling flow or a pump that runs dry warns of a dropping water table or a fouled screen years ahead of failure.
- Annual water testing is not optional for a private well. Public systems test for you; a private owner tests alone.
- Shock chlorination is both a fix and a routine. After any flood, work or bacterial result, it resets the system to safe.
The full list
The same list the builder above ticks. Use it for printing or when JavaScript is off.
Seal and inspect the wellhead
Nearly every preventable contamination starts at the top of the casing.
- COREA sound, tight sanitary cap or well seal on top of the casing Amazon
- COREA intact surface seal and concrete apron sloping away from the casing Amazon
- Casing inspected for corrosion, cracks and a secure above-ground section Amazon
- Grounds kept clear of chemicals, fuel stores, and drains within the setback Amazon
Test the water every year
A private well is only as safe as the last honest test.
- COREAn annual laboratory sample for total coliform and E. coli bacteria Amazon
- CORENitrate testing, especially where septic systems or fertiliser are nearby Amazon
- A metals and hardness panel for iron, manganese, lead and arsenic Amazon
- A simple conductivity or TDS reading kept as a yearly trend line Amazon
Check pump and yield
The well's flow rate is its vital sign; measure it once a year.
- COREA recovery or yield test timing litres per minute from a drawn-down well Amazon
- The standing water level noted so a falling table is visible over years Amazon
- Pump cut-in and cut-out pressures logged against the original duty Amazon
- COREWatch for sand or grit in the water as a screen or lining warning Amazon
Pressure tank and controls at the well
The pressure set the pump to run is the part between the well and the house.
- COREPressure tank pre-charge checked with the tank drained, air just below cut-in Amazon
- Bladder condition confirmed: a waterlogged tank thuds and short-cycles the pump Amazon
- Pressure switch and its cut settings verified against the log Amazon
- COREAny low-level or dry-run cut-out tested so the pump cannot run a dry well Amazon
Power and wiring at the wellhead
The most dangerous, least-looked-at part of a well is the electrical connection.
Check valve and sediment
The check valve protects the prime; sediment tells you what the well is doing.
- COREPump-short-cycle or backspin symptoms checked as an early check-valve fault Amazon
- A rising sand or silt load logged as a possible screen or falling-table sign Amazon
- Sediment from the pressure tank drained off on a schedule Amazon
- COREA drop in clear-water pressure investigated rather than ignored Amazon
Respond to events and keep records
Some years the well needs more than routine. Plan the response.
- COREShock chlorination after any flood, opening, or bacterial test result Amazon
- COREA re-test for bacteria 1 to 2 weeks after any chlorination or repair Amazon
- A well file with construction depth, casing, yield and every test result Amazon
- A vetted local well contractor on file for pumps, casing and rehabilitation Amazon
You are your own water utility
A household on mains water borrows an entire invisible operation. Someone tests the supply, monitors pressure and maintains the source. On a private well, that operation is yours. Nobody checks your bacteria count unless you pay for the test and send the sample.
That independence is a real benefit until it is a real responsibility. A well can quietly fall out of safe or out of yield with no alarm at all. The water looks clear and tastes fine while a loose cap lets surface water down, or a screen slowly silts up.
So the mindset that keeps a well healthy is treating it like infrastructure with a maintenance schedule, not a tap that simply exists. A few hours and a modest test fee each year prevent the two ways wells fail, unsafe water and no water.
The good news is that a well's needs are small, knowable and repeatable. Seal the top, test the water, measure the flow, check the electrics, and respond to events. Do that and a decent well outlives the house above it.
Clear is not safe: Bacteria, nitrate and many dissolved metals are invisible and tasteless. The only honest verdict on a well's safety is an annual laboratory test, never a glance at a clear glass.
On a private well there is no one else watching. Treat it as owned infrastructure on a yearly schedule, because it fails quietly without a utility to catch it.
Contamination mostly comes down from the top
People imagine a well being polluted from deep underground. The everyday reality is that contamination enters at the surface and travels down the outside of the casing or through a poor seal. The wellhead is the actual front line.
Three details do most of the protecting. A tight sanitary cap stops surface water and insects entering the top of the casing. A proper surface seal and a concrete apron that slopes away from the casing keep runoff from ponding and soaking down. A clear setback with no fuel, chemicals or drains near the head removes the sources in the first place.
Inspect these every year. A cracked apron, a rusted cap, or a nest of debris against the casing each tells you exactly where the next problem would start. They are cheap fixes in spring and expensive ones after a positive bacteria test.
One more surface path matters after heavy rain or flooding. If water reaches the wellhead, or the ground around it saturates, shock-chlorinate the system and re-test. Flood water pushed down a casing is a classic route to a sick household.
The ten-cent fix: A replacement sanitary cap costs very little. It is the single cheapest defence against a bacterial result, and it is the item most often found loose, rusty or missing.
Most well contamination enters at the surface. A sound cap, a sealed and sloped apron, and a clear chemical-free setback defend the whole system.
Yield is the well's vital sign
Beyond safety, a well's other big question is simply whether it still produces enough. A well does not usually go dry overnight. It fades, and the fading shows up first in performance you can measure once a year.
Run a simple recovery test. After drawing the well down, time how many litres per minute come back. Compare that against last year. A steady fall in recovery points to a dropping water table or a fouling screen, and gives you years of warning before the pump starts running dry.
Two supporting readings complete the picture. Note the standing water level so you can see the table move over seasons. Log the pump's cut-in and cut-out pressures so a change in the well or pump is visible against the original duty.
Watch sand and grit too. A well that suddenly starts delivering sediment may have a failing screen or a lining problem. Treat new sand as a message about the bore itself, not just a nuisance at the tap.
The dry-run guard: A falling water table eventually starves the pump. A low-level cut-out is the device that turns that slow problem into an alarm instead of a burnt motor. Test it yearly.
Test recovery in litres per minute, track the water level and pressures, and note new sand. A year-on-year trend reveals a fading well long before it fails.
The electrical end is where wells get dangerous
A well pairs a powered pump with permanent moisture and often an buried cable, so the electrical side deserves as much attention as the plumbing. It is also the part most owners never inspect until a fault or, worse, a shock.
Start at the disconnect and conduit by the wellhead. Look for weathering, cracked insulation and a box that still sheds water rather than collects it. Confirm the pump and casing are properly grounded and bonded. Good bonding protects both the equipment and anyone standing in wet ground nearby.
Test the protection devices, do not assume them. Press the RCD or GFCI test button on the pump circuit monthly. Keep the control box, start capacitor and relay dry and free of corrosion, because those small parts are the usual cause of a pump that hums but will not start.
None of this asks you to work on live wiring. The routine is visual and button-test only. Anything beyond that belongs to a qualified electrician, and the well file is the place to record who last did it and when.
Hums but no start: Before you blame a seized well pump, check the capacitor and relay. Those cheap parts cause a surprising share of no-start calls, and a dry, corrosion-free control box prevents most of them.
Water plus power plus damp ground makes the wellhead electrical end the risky part. Inspect it yearly, test the RCD monthly, and leave live work to an electrician.
The pressure set sits between well and house
The pressure tank, switch and check valve form the bridge between the well and the taps. They do not belong to the bore exactly, and they do not belong to the house plumbing either. Treat them as part of the well system and they behave predictably.
Check the tank's air pre-charge once a year with the tank drained. It should sit just below the pump's cut-in. A flat charge lets the pump short-cycle, and a waterlogged bladder, which thuds instead of ringing when tapped, quietly murders pump life one rapid start at a time.
The check valve keeps the column of water between the well and the tank from draining back overnight. When it fails, the pump re-primes and spins backwards, and you see it as short-cycling or a pressure that will not hold. It is a small part with a large, telltale symptom.
Drain any sediment that collects at the bottom of the pressure tank on schedule. Silt in the tank is silt that was headed for your household plumbing and water heater, and a periodic flush keeps it where it belongs.
Read the cycling: Rapid pump on-off at a small draw is almost always a flat or waterlogged tank. Backspin on stop is a failed check valve. Both tell you the fault before you lift a spanner.
Service the bridge: yearly tank pre-charge, a check valve that holds prime, and sediment drained from the tank keep the well-to-house section smooth.
Chlorinate to reset, then re-test
Shock chlorination is how a well gets returned to safe after an event that may have compromised it. Flooding, any work that opened the system, a new well, or a positive bacteria result are the standard triggers. It is both a fix and, for some wells, an annual habit.
The method is deliberate, not casual. A measured chlorine solution is introduced into the casing, run to every tap until the smell is detected, left to dwell for the required contact time, then flushed and re-tested. The goal is a strong, known dose throughout, not a splash of bleach at the cap.
The discipline that follows matters as much as the chlorination itself. Wait one to two weeks and send a fresh bacteria sample. Only a clean re-test proves the well is safe again. Treating and never re-checking is a false reassurance.
Chlorination will not fix a structural contamination path. If bacteria keep returning, the problem is a loose cap, a poor seal or a source nearby, and repeated dosing only masks it. A recurring result is a signal to inspect the wellhead and, if needed, rehabilitate the well.
The return visitor: A well that tests positive again a few months after chlorination has an entry route. Find it at the top of the casing rather than buying more bleach every season.
Shock-chlorinate after any flood, opening or bacterial result, wait a week or two, and always re-test. Repeat contamination means a surface path, not just a dose.
Keep a well file for the next owner
A well has a hidden biography, and most of it lives underground where no future owner can see it. Construction depth, casing size and material, the original yield, the static water level, every pump change and every test result: this is the record that makes sensible maintenance possible over decades.
Keep that file simple and physical. One waterproof folder or notebook by the wellhead or in the house holds the numbers and a running table of annual test results. Each year you add a line. Over time the file reveals the trends no single visit could show.
The file also carries the contacts and jobs that matter. The name of the driller and the well contractor, the pump model and its spares, the last shock chlorination, the last electrical inspection. When a real fault arrives, the file is the difference between an informed repair and an expensive guess.
Finally, treat the well as a transferable asset. A documented well with clean test history is worth far more, to the next owner as to you, than an undocumented hole in the ground. The hour you spend filing it pays back at every future repair and at sale.
Photograph the plate: Shoot the pump and motor nameplate and store it in the file. When the pump fails at midnight, the model number is the one thing you will need to get the right replacement.
Keep a running well file: depth, casing, yield, water level, every test and repair. Trends across years catch what any single check misses.
Well care calendar
| Frequency | Task | Why it matters | Effort |
|---|---|---|---|
| Monthly | Test RCD/GFCI at the pump circuit | Electrical safety near water | 1 minute |
| Quarterly | Glance at wellhead cap, apron, and any new sand | Catch surface contamination paths | 5 minutes |
| Annually | Lab test: bacteria, nitrate, metals; yield test | The only proof a private well is safe | Sample + small fee |
| Annually | Tank pre-charge, check valve, chlorinate if due | Prevent short-cycling and reset after events | 1 hour |
| As needed | Shock chlorinate and re-test after flood or work | Seal a contamination event | Half a day |
A typical private-well schedule. Wells with a history of contamination, or in flood-prone or high-nutrient ground, need more frequent testing and closer wellhead watch.
Key terms
- Sanitary seal
- The cap and grout arrangement that closes the top of a well casing to keep surface water and insects from entering the bore.
- Standing water level
- The height of water in an untouched well, measured from the top of the casing; tracking it shows the water table rising or falling over years.
- Recovery test
- Timing how fast a drawn-down well refills, in litres per minute; the standard measure of a well's yield and health.
- Shock chlorination
- Introducing a strong, known chlorine dose through the whole well and plumbing, dwelling it, then flushing, to kill bacterial contamination.
- Check valve
- A one-way valve in the well line that stops the water column draining back, preserving pump prime and preventing short-cycling.
- Total coliform
- A group of indicator bacteria whose presence in a well sample signals that contamination can reach the water and demands follow-up.
Tips and common mistakes
Field-tested tips
- Send the annual bacteria sample in a season when you already visit the well, so the test never becomes a trip of its own that gets deferred.
- Record the standing water level every year on the same date. One number a year, and a five-year column tells you more about the aquifer than any single reading.
- Keep a spare cap, a length of well pipe and the pump nameplate photo in the well file. The cheap preparedness items are the ones that make an emergency repair same-day.
- If you draw water for drinking, test before, not after, the first rainy season at a new well, so a baseline exists before any flood can confuse it.
Common mistakes
- Assuming a well is maintenance-free because it has no moving parts you can see above ground.
- Skipping the annual water test because the water looks clear, then discovering bacteria only through illness.
- Ignoring a loose cap or cracked apron, the exact surface paths from which most contamination enters.
- Chlorinating repeatedly to chase a positive result instead of finding the structural entry route at the wellhead.
Frequently asked questions
How often should a private well be maintained?
Do three things yearly at minimum: test the water with a laboratory sample for bacteria, nitrate and metals, run a simple yield or recovery test, and inspect the wellhead cap, seal and apron. Test the pump-circuit RCD monthly. Shock-chlorinate and re-test whenever there has been a flood, any work that opened the system, or a positive bacteria result.
How do I keep my well water safe to drink?
Safety on a private well rests on three habits. Keep the wellhead sealed with a sound cap and a sloped concrete apron so surface water cannot enter. Test the water annually through a laboratory, because bacteria and many contaminants are invisible. And after any flood, repair or positive test, shock-chlorinate the system and re-test until clean. Clear water is not proof of safe water.
What are signs a well is going bad?
Watch for a falling yield where the pump runs longer or starts running dry, new cloudiness or sand in the water, a change in taste or smell, and bacteria returning on test. Pressure problems such as rapid pump cycling can point to the tank or check valve rather than the well itself. Any one of these is a reason to test the water and check the wellhead.
Do I need to shock chlorinate my well every year?
Not every well, but some. Routine annual chlorination suits wells with a history of intermittent bacteria or in flood-prone ground. The clear triggers for any well are a positive bacteria result, flooding reaching the wellhead, or any work that opened the casing or lines. After chlorinating, always wait one to two weeks and re-test to confirm the well is clean.
What should be in a well maintenance record?
Keep the well's biography: construction date and depth, casing size and material, the original and current yield, the standing water level, the pump model and nameplate, every annual test result, and each repair, chlorination and electrical inspection with its date. A simple waterproof logbook holds it. Trends across years reveal a fading well or a recurring contamination path that one visit never would.
Who maintains a private well, the owner or the water supplier?
On a private well the owner is entirely responsible. Unlike mains water, there is no utility testing your supply, monitoring pressure or protecting the source. That means the annual water test, the wellhead inspection, the pump and electrical checks and the records are all the household's job. You may hire a licensed well contractor for repairs and pump work, but the schedule itself is yours to keep.
About this checklist
- Prepared by
- Spare Theory editorial · research-based
- Last checked
- 2026-10-16
How we choose what earns a spotWe treat private-well upkeep as owner-run infrastructure: protect the wellhead from surface contamination, test the water annually through a laboratory, measure yield as a health trend, and service the pump, pressure and electrical parts on their own clocks. Chlorination, re-testing and record-keeping follow established groundwater and household-well guidance. We name no brand, state no prices, and defer structural, electrical and pump repairs to licensed well contractors and qualified electricians.
Reference basisUS Environmental Protection Agency private well ownership and maintenance guidanceCenters for Disease Control and Prevention private water systems and well safety guidance