A well pump replacement in Southern Maryland costs $800 to $3,500 or more in 2026, with most homeowners in Calvert, St. Mary's, and Charles County paying $1,200 to $2,800 for a submersible pump replacement including parts, labor, and the crane or rig needed to pull the old pump from the well. Shallow well jet pump replacements are less expensive, $400 to $1,200 installed, because the pump sits in the basement or pump house rather than hundreds of feet underground. If your pressure tank also needs replacing, add $300 to $1,500 depending on the tank size.
If you live in Southern Maryland outside of the public water service areas, and that is the majority of the tri-county area, your home runs on a private well. Calvert County is almost entirely on well water south of Dunkirk, with public water available only in limited areas around Prince Frederick and a few community systems. St. Mary's County has public water service in parts of Lexington Park, California, and the Leonardtown area, but everywhere else, Hollywood, Mechanicsville, Ridge, St. Inigoes, Chaptico, Bushwood, you are on a well. Charles County has the most public water coverage in the region, serving Waldorf, La Plata, White Plains, and Indian Head, but the rural areas, Nanjemoy, Bryans Road, Cobb Island, Pomfret, Bel Alton, Hughesville, rely on private wells.
A well pump is the single point of failure in your entire water system. When it works, you do not think about it. When it fails, you have no water, no showers, no toilets, no laundry, no dishwasher, nothing. It is the kind of failure that demands immediate attention, which means understanding the costs, the options, and the warning signs before you are standing in the kitchen at 6 a.m. with a faucet that produces nothing but air.
Here is what well pump replacement costs in Southern Maryland, what affects that cost, and how to tell when your pump is on its way out.
Types of Well Pumps in Southern Maryland
The type of pump you need depends entirely on the depth of your well, and well depth in Southern Maryland varies enormously depending on which aquifer your well taps and where in the tri-county area your property sits.
Submersible Pumps
A submersible pump is a sealed, cylindrical unit that sits at the bottom of the well, submerged in water. The motor and pump are a single integrated unit lowered into the well on a pipe (the drop pipe), with an electrical cable running from the pump to a control box in the house. The pump pushes water up to the surface, it does not pull it, which allows it to work at depths that would be impossible for a surface-mounted pump.
Submersible pumps are the standard for any well deeper than 25 feet, which means they are the standard for the overwhelming majority of wells in Southern Maryland. Most residential wells in this region are drilled into Coastal Plain aquifers at depths of 100 to 400 feet. A well in Lusby tapping the Aquia aquifer might be 300 feet deep. A well in Mechanicsville drawing from the Piney Point aquifer might be 200 feet. A well in Waldorf might be 150 feet to the Magothy aquifer. At these depths, a submersible pump is the only option.
Submersible pumps are reliable, quiet (because they are hundreds of feet underground), and efficient. The trade-off is that when they fail, replacing them means pulling the entire pump and drop pipe assembly out of the well, a job that requires specialized equipment and typically cannot be done by a homeowner.
Jet Pumps (Shallow Well)
A jet pump sits above ground, in the basement, a crawl space, or a pump house, and uses suction to draw water up from the well. Single-line jet pumps work for wells up to about 25 feet deep. Dual-line (deep well) jet pumps can reach depths of 50 to 90 feet by using two pipes, one to push water down and one to pull it back up, with an ejector assembly (the jet) at the bottom of the well.
Jet pumps are less common in Southern Maryland because most wells here are too deep for them. You will find jet pumps on older, shallow wells in the low-lying areas near the Chesapeake Bay and tidal rivers, some older homes in Chesapeake Beach, North Beach, Solomons, and along the Patuxent and Potomac shores have shallow hand-dug or driven wells from the 1940s through the 1970s that still use jet pumps. These wells are typically 15 to 50 feet deep and draw from shallow, unconfined aquifers.
Jet pumps are easier to service (they are right there in the basement, not 200 feet underground), but they are noisier, less efficient, and cannot reach the depths that most Southern Maryland wells require.
Well Pump Replacement Cost by Pump Type
| Pump Type | Unit Cost | Installed Cost | Best For |
|---|---|---|---|
| Shallow well jet pump (single-line, up to 25 ft) | $200 to $500 | $400 to $1,000 | Shallow wells under 25 feet |
| Deep well jet pump (dual-line, 25 to 90 ft) | $300 to $800 | $600 to $1,500 | Medium-depth wells, 25 to 90 feet |
| Submersible pump, 1/2 HP (up to 150 ft) | $300 to $700 | $800 to $2,000 | Moderate-depth wells, 2 to 3 bedroom homes |
| Submersible pump, 3/4 HP (up to 250 ft) | $400 to $900 | $1,000 to $2,500 | Average-depth wells, 3 to 4 bedroom homes |
| Submersible pump, 1 HP (up to 350 ft) | $500 to $1,200 | $1,200 to $3,000 | Deep wells, larger homes |
| Submersible pump, 1.5 to 2 HP (250 to 500 ft) | $700 to $1,800 | $1,500 to $3,500+ | Very deep wells, high-demand homes |
| Constant pressure (variable speed) submersible | $1,000 to $2,500 | $2,000 to $4,500 | Homes wanting steady, consistent water pressure |
The installed cost for a submersible pump includes the pump unit, the drop pipe, the pitless adapter (the fitting at the top of the well casing that directs the water line horizontally to the house below the frost line), the electrical wiring and control box, the labor to pull the old pump and install the new one, and the equipment needed to do the work. That equipment, a crane, a pulling rig, or a pump-pulling unit, is a significant part of why submersible pump replacement costs more than the pump itself would suggest.
Well Pump Replacement Cost by Well Depth
Well depth is the biggest single cost driver for a submersible pump replacement. A deeper well requires more drop pipe, more electrical wire, more labor time to pull and reinstall, and a more powerful (more expensive) pump. Here is how the costs break down for a typical submersible pump replacement in Southern Maryland.
| Well Depth | Pump HP Needed | Drop Pipe Cost | Total Installed Cost |
|---|---|---|---|
| 50 to 100 feet | 1/2 HP | $100 to $250 | $800 to $1,500 |
| 100 to 150 feet | 1/2 to 3/4 HP | $200 to $400 | $1,000 to $2,000 |
| 150 to 200 feet | 3/4 HP | $300 to $600 | $1,200 to $2,500 |
| 200 to 300 feet | 3/4 to 1 HP | $400 to $900 | $1,500 to $3,000 |
| 300 to 400 feet | 1 to 1.5 HP | $600 to $1,200 | $2,000 to $3,500 |
| 400 to 500 feet | 1.5 to 2 HP | $800 to $1,500 | $2,500 to $4,500+ |
Why depth matters so much. Every foot of well depth adds cost in three ways: more drop pipe (typically 1-inch or 1.25-inch polyethylene or galvanized pipe, priced per foot), more submersible electrical cable (priced per foot), and more time to pull the old assembly out and lower the new one in. Pulling 300 feet of pipe loaded with water is heavy, slow work that requires the right equipment. A 100-foot pump pull might take two hours. A 400-foot pump pull might take half a day.
Southern Maryland's Aquifer Geography
The cost of your well pump replacement is partly determined by geology you never think about, specifically, which aquifer your well draws from and how deep it sits below your property.
Southern Maryland sits on the Atlantic Coastal Plain, a wedge of sedimentary layers that tilt gently toward the east and southeast. The aquifers here are layers of sand and gravel sandwiched between layers of clay and silt. The deeper you go, the older the formation and, generally, the better the water quality, but also the higher the drilling and pumping cost.
The Aquia aquifer is one of the most commonly used aquifers in Calvert and St. Mary's County. It sits at depths of 150 to 400 feet depending on location. Wells tapping the Aquia aquifer in Lusby, Solomons, Prince Frederick, and Huntingtown typically run 200 to 350 feet deep. The Aquia produces reliable yields and generally good water quality, though iron and manganese levels can be elevated.
The Piney Point aquifer is another major source in St. Mary's County, sitting at 100 to 300 feet. Wells in Leonardtown, Hollywood, Mechanicsville, and California commonly draw from the Piney Point. Yields are generally good, 10 to 30 gallons per minute for residential wells, but the water can be hard and may contain elevated iron.
The Nanjemoy formation sits between the Aquia and the Piney Point in some areas and can produce water, but yields are typically lower and less reliable. Some wells in the Nanjemoy area of Charles County and parts of western Calvert County draw from this formation.
The Magothy aquifer serves parts of Charles County, particularly around Waldorf, La Plata, and Indian Head, at depths of 100 to 250 feet. The Patapsco and Patuxent aquifers sit deeper still, 400 to 800 feet in some locations, and are tapped by deeper wells when the shallower aquifers do not provide adequate yield.
What this means for pump replacement costs: if your well is 120 feet deep and draws from a shallow formation, your pump replacement will cost $1,000 to $1,800. If your well is 350 feet deep and draws from the Aquia aquifer, you are looking at $2,000 to $3,500. You cannot change your well depth (short of drilling a new well), so knowing how deep your well is before you call for quotes helps you understand the price you are quoted. Your well driller's log, filed with the Maryland Department of the Environment, records the well depth, the casing depth, and the aquifer the well taps. Your county health department may also have a copy.
Pressure Tank Replacement Cost
The pressure tank works in partnership with the well pump. It is a sealed tank, typically in the basement or utility room, that stores pressurized water and delivers it to your fixtures on demand. When you turn on a faucet, the water comes from the pressure tank, not directly from the pump. As the tank pressure drops to a set point (typically 30 or 40 PSI), the pressure switch activates the pump, which refills the tank and pressurizes it back to the cut-off point (typically 50 or 60 PSI). The pump then shuts off.
A failing pressure tank causes the pump to cycle on and off rapidly (short-cycling), which burns out the pump motor prematurely. If your pump is short-cycling, the pressure tank is the likely culprit, and replacing the tank now ($300 to $1,500) is far cheaper than replacing the tank and the pump later ($2,000 to $4,500).
Pressure Tank Cost by Size
| Tank Size | Drawdown (gallons) | Cost (unit only) | Installed Cost | Best For |
|---|---|---|---|---|
| 20 gallons | 5 to 7 gallons | $150 to $300 | $300 to $600 | Small homes, 1 to 2 bathrooms |
| 32 to 35 gallons | 8 to 14 gallons | $250 to $450 | $450 to $800 | Average homes, 2 to 3 bathrooms |
| 44 to 50 gallons | 14 to 20 gallons | $350 to $600 | $600 to $1,000 | Larger homes, 3 to 4 bathrooms |
| 80 to 86 gallons | 25 to 36 gallons | $500 to $900 | $800 to $1,300 | Large homes, high demand, irrigation |
| 119 to 120 gallons | 35 to 50 gallons | $700 to $1,200 | $1,000 to $1,500 | Very large homes, multiple buildings |
Drawdown is the key specification, it is the amount of usable water the tank delivers between the pump's cut-in and cut-off pressure. A 35-gallon tank with a 10-gallon drawdown means the pump does not need to run until you have used 10 gallons. The larger the drawdown, the fewer times the pump cycles per day, and fewer cycles mean a longer pump life.
When to replace the pressure tank. A waterlogged tank (the air bladder has failed and the tank fills entirely with water) causes rapid pump cycling, the pump turns on and off every few seconds when water is running because the tank has no air cushion to maintain pressure between cycles. A waterlogged tank is easily tested: knock on the tank. If it sounds solid from top to bottom (no hollow air space in the upper portion), the bladder has failed. You can also check the air charge on the Schrader valve at the top of the tank with a tire gauge, it should read 2 PSI below the cut-in pressure (typically 28 PSI for a 30/50 system). If it reads zero or very low, the bladder is ruptured.
Replace the pressure tank when you replace the pump. If your pressure tank is more than 10 years old and you are already paying for a pump replacement, replacing both at the same time saves a second service call ($150 to $300) and ensures the new pump is not damaged by a failing tank. A pressure tank lasts 7 to 15 years depending on the water quality, hard, mineral-laden well water corrodes the bladder and the tank interior faster than soft water.
What Affects Well Pump Replacement Cost
Beyond well depth and pump type, several factors push the cost higher or lower.
Electrical Upgrades
Older well pump installations in Southern Maryland, particularly those from the 1960s through the 1980s, may have undersized wiring, outdated control boxes, or corroded electrical connections. If the well pump circuit uses aluminum wiring, old cloth-insulated wire, or undersized gauge wire for the pump being installed, the electrician (or the well contractor, if licensed for electrical work) will need to upgrade the circuit. Rewiring from the electrical panel to the pressure switch and control box adds $200 to $800 depending on the distance and the work involved.
A submersible pump runs on a dedicated circuit, typically a 230-volt, 20A or 30A circuit depending on the pump's horsepower. The control box (for three-wire submersible pumps) contains the starting capacitor and relay, and it mounts near the pressure tank. Replacing a failed control box adds $100 to $300 to the job.
Pitless Adapter Replacement
The pitless adapter is the fitting that connects the vertical drop pipe inside the well casing to the horizontal water line that runs underground to the house. It is installed below the frost line (typically 30 to 36 inches in Southern Maryland) to prevent freezing. Pitless adapters corrode and fail over time, especially in wells with aggressive water chemistry. Replacing the pitless adapter during a pump replacement adds $150 to $400 in parts and labor, and since the well is already open and the pump is already pulled, this is the cheapest time to do it.
Well Casing Condition
When the pump is pulled, the well contractor can inspect the upper portion of the well casing. Steel casings rust from the inside out, and older wells (drilled before PVC casing became standard) may have corroded casings that need a liner installed. A casing liner adds $1,000 to $3,000 or more depending on the depth and diameter. This is not a routine cost, but it is a possibility that your contractor should assess during the pump replacement.
Access and Equipment
The location of the well head affects cost. A well head in an open yard is straightforward. A well head in a tight corner next to the house, under a deck, behind a fence, or surrounded by landscaping requires extra time and sometimes smaller equipment to access. Difficult access can add $200 to $500 to the job. A well head that has been paved over, buried, or lost (it happens more often than you would expect in older properties) requires locating and excavating before any work can begin.
Water Quality Treatment
Southern Maryland well water frequently requires treatment. Iron, manganese, hardness, low pH, and occasionally hydrogen sulfide (the rotten-egg smell) are common water quality issues in the region's Coastal Plain aquifers. Treatment does not directly affect the pump replacement cost, but it is related: if you are already opening up the well system for a pump replacement, this is a logical time to add or upgrade a water treatment system. A whole-house iron filter runs $800 to $2,000 installed. A water softener runs $1,000 to $3,000. An acid neutralizer for low-pH water runs $800 to $1,500. Bundling treatment system installation with a pump replacement saves on labor because the plumber is already on site working on the system.
Signs Your Well Pump Is Failing
A well pump rarely fails without warning. The symptoms build over weeks or months before the pump quits entirely, and catching them early sometimes means a repair rather than a full replacement.
No water at all. The most obvious sign. You turn on a faucet and nothing comes out, or the pump runs but produces no water. This could be a failed pump motor, a failed pressure switch, a tripped circuit breaker, or, less commonly, a well that has gone dry. Before assuming the pump has failed, check the electrical panel for a tripped breaker and check the pressure switch for a stuck contact. If the breaker trips repeatedly when reset, the pump motor has likely shorted or seized.
Low water pressure throughout the house. A gradual decline in water pressure, not a sudden loss, indicates a pump that is wearing out and losing its ability to push water to the surface. A pump that used to maintain 50 PSI and now struggles to reach 35 PSI is nearing the end of its life. Low pressure can also indicate a failing pressure tank, a clogged pressure switch, or a partially closed valve, a technician can diagnose which component is at fault.
The pump runs constantly. A healthy pump runs for a few minutes to fill the pressure tank, then shuts off and stays off until the tank pressure drops again. If the pump runs continuously or cycles on and off every few seconds (short-cycling), something is wrong. Constant running means the pump cannot build enough pressure to reach the cut-off point, the pump is worn, there is a leak in the drop pipe, or the well's water level has dropped below the pump. Short-cycling typically means the pressure tank has lost its air charge.
Sputtering or spitting at the faucet. Air in the water lines, causing sputtering and uneven flow when you turn on a faucet, can indicate that the well's water level has dropped near the pump intake, that the drop pipe has a crack or loose connection allowing air in, or that the pump is drawing air because it is failing.
Unusually high electric bills. A well pump that is working harder than it should, running longer, cycling more often, or struggling against increased friction from worn impellers, draws more electricity. A noticeable increase in your electric bill without a corresponding change in water use is worth investigating.
Dirty, sandy, or silty water. A pump that is pulling sand or sediment is either set too deep (near the bottom of the well where sediment collects), has a failing screen on the intake, or is in a well where the screen or casing has deteriorated and is allowing formation material into the well. Sand running through the pump accelerates wear and can destroy a pump in months.
Strange noises from the pressure tank or pipes. Clicking from the pressure switch every few seconds (short-cycling), banging pipes (water hammer from rapid pump cycling), or humming from the control box without the pump actually running (a seized motor drawing power but not turning) are all signs of pump system problems.
Repair vs. Replace: When Each Makes Sense
Not every well pump problem requires a full pump replacement. Some issues are in the above-ground components, the pressure switch, the control box, the pressure tank, or the wiring, and cost far less to fix.
| Issue | Repair Cost | When to Repair | When to Replace the Pump |
|---|---|---|---|
| Pressure switch failure | $100 to $250 | Switch is the problem, pump is under 10 years old | Pump is also failing or over 15 years old |
| Control box failure | $150 to $350 | Control box is the problem, pump motor tests good | Motor is drawing abnormal amps or pump is old |
| Pressure tank waterlogged | $300 to $1,000 | Tank is the problem, pump is healthy | Tank failure has caused pump to short-cycle for months |
| Tripped breaker / wiring issue | $100 to $400 | Wiring or connection is faulty, pump tests good | Pump is drawing excess current indicating motor failure |
| Low water pressure | $100 to $500 (diagnosis + minor fix) | Clogged filter, partially closed valve, or low air charge | Pump impellers are worn and cannot maintain pressure |
| Pump motor failure | N/A, full replacement | Always replace if motor has failed | |
| Pump making noise or vibrating | N/A, full replacement | Worn bearings, damaged impellers, replacement time |
The rule of thumb: if the pump itself is under 10 years old and the problem is an above-ground component (switch, tank, control box, wiring), repair it. If the pump is over 15 years old and you are pulling it from the well for any reason, replace it, the labor cost to pull and reinstall the pump is the same whether you put the old pump back or a new one, so replacing an aging pump while it is already out of the well is the cost-effective move.
Permits and Regulations in Southern Maryland
Well pump replacement in Maryland does not typically require a permit, but there are important regulatory considerations.
Pump replacement only. Swapping a failed pump for a new one in an existing well, without modifying the well casing, the well depth, or the well's location, generally does not require a well permit from the Maryland Department of the Environment or the county health department. The work should be performed by a licensed well driller or pump installer.
Well modification or deepening. If the well needs to be deepened, recased, or rehabilitated as part of the pump replacement project, a well construction permit is required from the county health department. Permit fees run $100 to $300.
Well abandonment. If you are connecting to public water and abandoning your well, Maryland requires proper well abandonment, the well must be sealed by a licensed driller to prevent groundwater contamination. Abandonment costs $500 to $2,000 depending on well depth and casing type.
Water testing. Maryland does not require routine water testing for private wells, but Calvert, St. Mary's, and Charles County health departments strongly recommend testing for coliform bacteria, nitrates, and other contaminants at least annually. When a pump is replaced, testing the water afterward is standard practice to confirm the system is delivering clean water. A basic water quality test costs $50 to $150 through a certified lab or the county health department.
Well location records. The Maryland Department of the Environment maintains well completion reports that record the well's depth, casing type and depth, yield, and the driller who installed it. This information is valuable when planning a pump replacement because it tells the contractor exactly what they are working with before they arrive on site.
Timing Your Well Pump Replacement
Fall is the ideal time for planned well pump work in Southern Maryland. The ground is accessible, temperatures are moderate for outdoor work, and you get the new pump installed before winter freezes arrive. A pump failure in January or February adds urgency and sometimes cost, frozen ground around the well head may need to be thawed, and emergency service calls during peak winter demand carry premium pricing.
Spring and summer are peak demand seasons for well contractors in the region because summer droughts lower water tables and push marginal pumps over the edge. If your pump is aging and you want to avoid competing with every other homeowner whose well just went dry in August, schedule the replacement for fall or early winter while contractors have more availability.
Emergency replacement. When a pump fails without warning, most well contractors in Southern Maryland can respond within 24 to 48 hours. A true emergency call (same-day or weekend service) may carry a $100 to $300 premium over a scheduled appointment. Having a relationship with a well contractor before you need one, getting that inspection done, getting on their customer list, means faster response when the pump fails at 11 p.m. on a Saturday.
Well Pump Lifespan and Maintenance
How long does a well pump last? A quality submersible pump lasts 10 to 25 years, with most lasting 12 to 18 years in Southern Maryland conditions. The wide range reflects differences in water quality (sandy or mineral-heavy water wears pumps faster), usage patterns (a pump serving a family of six cycles more than one serving a couple), and pump quality (a premium Grundfos, Franklin Electric, or Goulds pump outlasts a budget unit by years). Jet pumps last 8 to 15 years because they have more moving parts exposed to air and vibration.
What shortens pump life in Southern Maryland. Hard water with elevated iron and manganese, common in the Aquia, Piney Point, and Magothy aquifers, deposits mineral scale on pump components and inside the drop pipe, reducing flow and forcing the pump to work harder. Sandy water (from a deteriorating well screen or a well completed in a sandy formation without adequate screening) is even more destructive, sand acts as an abrasive on the pump's impellers and bearings, and a pump running on sandy water may fail in 3 to 7 years.
Maintenance that extends pump life. Unlike a furnace or a water heater, a submersible pump does not have user-serviceable maintenance items, you cannot change its oil or replace a filter. What you can do is maintain the components that protect the pump.
Keep the pressure tank properly charged. A waterlogged tank causes short-cycling, and short-cycling is the number one preventable cause of premature pump failure. Check the tank's air charge annually, the Schrader valve at the top of the tank takes a tire gauge, and the pressure should be 2 PSI below the cut-in pressure.
Keep the pressure switch clean and functional. The pressure switch contacts corrode over time, especially in humid basements. A sticking pressure switch can cause the pump to run continuously (burning out the motor) or not run at all. Replacing a pressure switch every 5 to 7 years as preventive maintenance costs $100 to $200 and protects a pump worth ten times that.
Test your water annually. Knowing your water quality lets you catch changes, a sudden increase in iron, sediment, or turbidity can indicate a well problem that, if addressed early, saves the pump.
Consider a water treatment system. If your water is hard, high in iron, or acidic, treating it upstream protects not just the pump but every water-using appliance in the house, the water heater, the dishwasher, the washing machine, the fixtures. A $1,500 iron filter or water softener protects thousands of dollars in equipment.
Well Water vs. Public Water: Should You Switch?
If public water is available on your street and your well pump has failed, you might wonder whether connecting to public water makes more sense than replacing the pump. The answer depends on the numbers and your situation.
| Factor | Well Water | Public Water |
|---|---|---|
| Pump replacement cost | $1,200 to $3,500 (one-time) | N/A |
| Connection fee (tap fee) | N/A | $3,000 to $15,000+ |
| Pipe from street to house | N/A | $1,500 to $5,000 (depending on distance) |
| Monthly water bill | $0 (electricity to run pump: $30 to $60/month) | $50 to $120/month |
| Ongoing maintenance | Pump replacement every 12 to 18 years, occasional repairs | None (utility responsibility) |
| Water quality control | You control treatment | Utility treats and monitors |
| Water pressure | Depends on your system | Typically consistent |
The connection fee is the deciding factor. In many parts of Southern Maryland, the connection fee (also called a tap fee, system development charge, or availability fee) to connect to public water ranges from $3,000 to over $15,000, depending on the water utility and the meter size. Add the cost of trenching a water line from the street to the house ($1,500 to $5,000 depending on distance and obstacles), the plumbing to tie into the house's existing system ($500 to $1,500), and you are looking at $5,000 to $20,000 or more to connect, compared to $1,200 to $3,500 to replace the well pump.
For most homeowners in Southern Maryland, replacing the well pump is the financially sound choice. Public water connection makes sense when you are already facing a major well problem, a well that is running dry, a casing that needs replacement, or contamination that requires expensive treatment, and public water is available at the street.
Frequently Asked Questions
How much does it cost to replace a well pump in Southern Maryland? A well pump replacement in the tri-county area costs $800 to $3,500 or more in 2026. A shallow well jet pump replacement runs $400 to $1,200 installed. A submersible pump replacement costs $1,000 to $3,500 depending on well depth, pump horsepower, and whether additional work is needed (pressure tank, pitless adapter, wiring). Most homeowners replacing a submersible pump in a 150- to 300-foot well pay $1,200 to $2,800 for everything, pump, drop pipe, fittings, labor, and equipment.
How long does a well pump last? A submersible well pump lasts 10 to 25 years, with 12 to 18 years being typical in Southern Maryland. Water quality is the biggest variable, hard, mineral-heavy water from the Aquia, Piney Point, or Magothy aquifers shortens pump life compared to cleaner, softer water. A jet pump lasts 8 to 15 years. A waterlogged pressure tank that causes the pump to short-cycle can cut the pump's lifespan in half, so maintaining the pressure tank is one of the most important things you can do to protect the pump.
How do I know if my well pump is going bad? The most common signs are low water pressure that gradually worsens, a pump that runs constantly or cycles on and off every few seconds, sputtering or air bursts at the faucets, muddy or sandy water, and unusually high electric bills. A sudden total loss of water could be a pump failure, but check the circuit breaker and the pressure switch first, both are common, inexpensive causes of no-water situations that do not require a pump replacement.
Can I replace a well pump myself? A jet pump (above-ground) is technically a DIY-possible job for a capable homeowner, since the pump sits in the basement and connects to standard plumbing. A submersible pump replacement is not a DIY project for most people, it requires pulling hundreds of feet of heavy, water-filled drop pipe out of the well, which takes specialized pulling equipment, and an improper installation can drop the pump to the bottom of the well, requiring expensive fishing or well rehabilitation. The labor cost to have a professional pull and reinstall the pump is money well spent.
Should I replace the pressure tank when I replace the pump? If your pressure tank is more than 10 years old, yes. A failing pressure tank causes short-cycling that destroys new pumps prematurely, and replacing both during the same service call saves $150 to $300 in labor compared to two separate visits. A new pressure tank costs $300 to $1,500 depending on the size, and it protects your $1,500 to $3,000 pump investment.
How deep are wells in Southern Maryland? Well depth varies widely depending on location and aquifer. Wells in Charles County near Waldorf and La Plata typically run 100 to 250 feet to the Magothy or Patapsco aquifers. Wells in Calvert County range from 150 to 400 feet, with many in the Lusby, Solomons, Prince Frederick, and Huntingtown areas tapping the Aquia aquifer at 200 to 350 feet. Wells in St. Mary's County typically run 100 to 300 feet to the Piney Point or Aquia aquifers. Your well driller's completion report, filed with the Maryland Department of the Environment, records your well's exact depth.
What is a constant pressure system and is it worth the upgrade? A constant pressure system uses a variable-speed pump controller that adjusts the pump's speed to match water demand in real time, maintaining steady water pressure regardless of how many fixtures are running. Instead of the pressure swinging between 30 and 50 PSI as the pump cycles on and off, a constant pressure system holds steady at your set pressure, typically 50 or 60 PSI. The upgrade costs $500 to $1,500 on top of a standard pump replacement (for the controller and a compatible pump motor). It is worth it if you notice pressure drops when multiple showers or fixtures run simultaneously, or if you have an irrigation system that requires consistent pressure. It also reduces pump cycling, which extends pump life.
Do I need a permit to replace a well pump? In most cases, no. A straightforward pump replacement in an existing, properly permitted well does not require a well construction permit in Maryland. If the well needs modification, deepening, new casing, rehabilitation, or sealing, a permit from the county health department is required. The work should still be performed by a Maryland-licensed well driller or pump installer regardless of permit requirements.
Need a well pump replacement? Gray & Sons Contracting has 50 years of experience building in Southern Maryland. We understand the water systems, well conditions, and permit process in Calvert, St. Mary's, and Charles County. Get a Free Estimate