City water arrives at your tap through a municipal system maintained by the city. Rural well water arrives at your tap through a system you own and are responsible for maintaining — a pump, a pressure tank, a pressure switch, and several hundred metres of pipe connecting it all together. When it works, you don't think about it. When something fails, knowing how the system works makes the difference between a clear troubleshooting conversation and a confusing emergency.
This guide explains each component in plain language, how they work together, and what fails when your water stops or pressure drops. The Government of Manitoba's water resources program maintains records on groundwater across the province — understanding your own system starts here.
The Well Itself
The well is a drilled bore hole — typically 10–20 cm in diameter — that extends down through the soil and rock to reach a water-bearing aquifer. In Manitoba's Interlake region, most residential wells reach depths of 30–120 metres depending on where the productive aquifer layers are located.
The well is lined with a steel or PVC casing that keeps the bore hole from collapsing and prevents surface water from contaminating the aquifer. At the surface, a well cap seals the top of the casing against insects, rodents, and surface water entry. The cap should be secure and undamaged — a compromised cap is a contamination risk.
Your well's original well log — drilled at the time of installation — records the depth, static water level (how high the water naturally sits in the casing), and the aquifer yield in gallons per minute. This document is essential for sizing replacement equipment correctly. The Government of Manitoba maintains a groundwater registry where most registered wells can be looked up by location if you don't have the original paperwork.
Submersible Pumps vs. Jet Pumps
There are two main well pump types, and they work very differently. Knowing which one you have matters when something needs service.
Submersible Pumps (The Standard for Most Manitoba Wells)
A submersible pump is exactly what the name suggests — the entire pump and motor assembly is submerged inside the well casing, sitting in the water near the bottom of the well. The motor is hermetically sealed and cooled by the surrounding water as it runs.
Inside the pump housing, a series of stacked impellers (spinning discs with curved vanes) accelerate water upward through centrifugal force. Each stage adds pressure, and a multi-stage pump can push water up from depths of 100 metres or more while maintaining adequate pressure at the surface.
The pump connects to the surface via a drop pipe — typically 1 to 1.25-inch poly pipe — that carries water up from the pump to the pitless adapter. The pitless adapter is a sanitary fitting at the frost line that connects the vertical drop pipe inside the casing to the horizontal supply line running underground to your house. This fitting allows the pump to be removed for service without digging up the yard.
The electrical cable for the pump motor runs alongside the drop pipe, exits the well casing, and runs underground to the control box and breaker panel inside the house. Most residential submersible pumps run on 240V power with a dedicated circuit breaker.
Advantages of submersibles: Quiet operation (the pump is underground), no priming required, efficient at depth, longer lifespan in clean water conditions, suitable for wells of any depth.
Jet Pumps (Older and Shallower Applications)
A jet pump sits above ground in the mechanical room rather than inside the well. It uses a different mechanism: a venturi nozzle creates a partial vacuum in the suction pipe, drawing water up from the well by atmospheric pressure difference. The fundamental limitation of this approach is physics — atmospheric pressure can only lift water about 7–8 metres, so shallow-well jet pumps only work on wells with a static water level within that range.
Deep-well jet pumps work around this by placing the venturi (ejector) assembly inside the well itself, using a two-pipe system — one pipe carrying pressurized water down to the ejector, and one return pipe bringing the pumped water back up. This extends the practical range to about 30 metres.
Jet pumps are more common in older installations. If your property has a well drilled before the 1990s and a pump sitting in the mechanical room (rather than underground), you likely have a jet pump system. They are noisier than submersibles, less efficient at depth, and have shorter average lifespans. Conversion to a submersible is often worth considering when a jet pump reaches end of life.
The Pressure Tank
The pressure tank is the large cylindrical tank in your mechanical room, typically 60–120 litres for a residential system. It serves a critical buffering function that most homeowners don't fully appreciate until it fails.
Inside the tank, a rubber bladder or diaphragm separates two chambers. One side contains air pre-charged to a specific pressure (typically 2 PSI below the pump's cut-in pressure). The other side fills with water from the pump.
Here's how it works in a cycle:
- You open a tap. Water flows from the pressure side of the tank to your fixture, and the air charge in the tank maintains pressure as the water level in the tank drops.
- When pressure drops to the cut-in setting (typically 40 PSI), the pressure switch signals the pump to start.
- The pump runs and fills the pressure tank, compressing the air charge until pressure reaches the cut-out setting (typically 60 PSI).
- The pressure switch shuts the pump off. Water for immediate use draws from the pressurized tank until pressure drops again.
Without the pressure tank, the pump would have to turn on every single time you opened a tap — even briefly. This would cycle the pump hundreds of times per day, destroying it within months. The pressure tank allows the pump to run in longer, sustained cycles and rest between them.
When the bladder fails: Water fills the entire tank, eliminating the air buffer. The pump is forced to cycle on and off every few seconds — this is called short-cycling. You'll notice it as a constant clicking from the pressure switch area and pump motor that cycles rapidly instead of running for several minutes. Short-cycling dramatically accelerates pump wear. A waterlogged pressure tank needs replacement promptly. Our guide to diagnosing low well water pressure explains how to confirm this before calling for service.
The Pressure Switch
The pressure switch is a small component near the pressure tank that monitors system pressure and controls the pump motor. Inside the switch, a diaphragm senses water pressure and activates electrical contacts at the set cut-in and cut-out pressures.
The contacts inside a pressure switch carry the full current load of the pump motor — typically 10–20 amps at 240V. Over time, the contacts can corrode or develop pitting from arc discharge, causing intermittent pump failures or erratic cycling. A pressure switch that's more than 10 years old on a property with hard water is worth inspecting — corrosion from hard water vapour in the mechanical room accelerates contact wear.
Most pressure switches are adjustable, though the factory settings (40/60 PSI or 30/50 PSI) are appropriate for most residential applications. Never adjust a pressure switch above 60 PSI cut-out without verifying that your pressure tank and plumbing can handle the higher pressure.
The Control Box
Most submersible pump systems have a control box — a panel near the pressure switch that houses the starting capacitor and relay for the pump motor. The starting capacitor provides the initial surge of current needed to start the pump motor, while the relay switches the motor to running current once it's up to speed.
Control boxes are a common failure point, particularly after power outages. Voltage spikes on power restoration can burn out capacitors without damaging the pump motor itself. If your pump stopped working after a power outage, checking the control box is the first step before assuming the pump has failed. A blown capacitor is a $50–100 fix; a failed pump is a full replacement job. This is covered in detail in our well pump guide for rural Interlake properties.
How the System Delivers Water to Your Taps
Tracing the full path from aquifer to tap:
- Groundwater enters the well casing through the perforations or screen at the bottom of the casing, from the aquifer.
- The submersible pump draws water in through its intake screen and pushes it up the drop pipe.
- Water passes through the pitless adapter at the frost line and travels underground to the house through the buried supply line.
- Inside the house, water enters the pressure tank, and pressurized water is distributed throughout the home's plumbing system.
- The pressure switch monitors system pressure and cycles the pump on and off to maintain pressure within the set range.
The entire system is designed to be self-regulating — once set up correctly, it should run for years without adjustment. Problems arise from component wear (pump, bladder, pressure switch contacts), water quality (mineral deposits, sediment), or external factors (power quality, frozen lines).
What Happens to Each Component Over Time
Understanding the failure modes helps you recognize early warning signs:
- Pump impellers: Wear from mineral abrasion gradually reduces flow rate and efficiency. Signs: slower pressure recovery, pump runs longer than it used to.
- Pressure tank bladder: Rubber degrades over time, eventually failing and causing short-cycling. Signs: pump cycles rapidly, clicks every few seconds.
- Pressure switch contacts: Corrode and pit from load switching. Signs: pump fails to start intermittently, or pump runs continuously without shutting off.
- Control box capacitor: Degrades from heat cycling and voltage events. Signs: pump hums but won't start, tripped thermal overload.
- Drop pipe fittings: Corrode in aggressive water chemistry. Signs: air entrainment in water, pressure loss, visible rust at wellhead.
Most of these failure modes develop gradually and are catchable with annual well system maintenance. Sudden failures — from power surges, frozen lines, or catastrophic bladder rupture — are less predictable but less common.
If you've just taken ownership of a rural property and want to understand the condition of your well system, a professional assessment covers all of these components in a single visit. Our well pump and pressure system service includes inspection, flow rate testing, and an honest assessment of what each component has left in it.
New to Rural Property Ownership?
If you've recently purchased an acreage or rural home in the Interlake, a well system inspection and water quality test is one of the most valuable things you can do in the first year. It tells you the pump's condition, confirms water is safe to drink, and flags any treatment needs before they become problems. Contact us to arrange an inspection.
Well System Questions? We're Straightforward.
We explain what we find in plain language and give upfront quotes before any work begins. Serving rural properties throughout the Interlake since 2011.
Contact Patterson MechanicalFrequently Asked Questions
What is the difference between a submersible pump and a jet pump?
A submersible pump sits inside the well casing, submerged in the water. The entire motor and pump assembly is sealed and cooled by the surrounding water, making it quiet and efficient at any depth. A jet pump sits above ground in the mechanical room and uses a venturi nozzle to create suction that draws water up. Jet pumps are limited by physics to shallow wells (water table within 7–8 metres of surface for shallow-well models) and have shorter lifespans under demanding conditions. Most rural Manitoba properties use submersible pumps.
Why does my pump turn on and off every few seconds?
This is called short-cycling and almost always indicates a waterlogged pressure tank — meaning the rubber bladder inside the tank has failed, allowing water to fill the air chamber. Without the air buffer, pressure drops to the cut-in setting almost immediately after the pump turns on, and the pump cycles continuously. A waterlogged tank needs replacement. Short-cycling dramatically accelerates pump wear, so this is worth addressing promptly rather than waiting. Our guide to diagnosing low water pressure explains how to confirm this yourself before calling.
What does a pressure tank actually do?
The pressure tank stores a volume of pressurized water so the pump doesn't have to start every time you open a tap. Inside the tank, a rubber bladder separates a pre-charged air chamber from the water side. As you draw water, pressure drops gradually through the air charge. When pressure reaches the cut-in setting, the pump starts and refills the tank. Without the tank, the pump would cycle hundreds of times per day — destroying it quickly. A healthy residential pressure tank allows the pump to run in 2–5 minute cycles rather than seconds.
How deep are typical wells in the Manitoba Interlake?
It varies significantly by location. Many Interlake properties have wells in the 30–60 metre range, drawing from limestone aquifers. Some areas north of Stonewall and toward Teulon have wells reaching 80–120 metres depending on local geology. Well depth affects pump selection, replacement cost, and the weight of drop pipe involved in service calls. If you don't know your well depth, the Government of Manitoba's groundwater registry can usually provide this for registered wells.
When should I replace my pressure tank vs. the pump?
Pressure tanks and pumps have similar lifespans (10–15 years) but fail independently. If only the tank has failed (waterlogging, short-cycling) and the pump is performing well, replace the tank. If only the pump is aging or failing and the tank is functioning correctly, replace the pump. If both are at or near end of life, replacing them together in one service call saves significantly on mobilization cost — particularly on rural properties where bringing a pump truck out is part of the job cost. See our well pump replacement cost guide for the combined vs. separate replacement math.