8 Signs Your Well Is Failing (And What to Do)

Q: How do I know if my well is going bad?

The most common signs are air sputtering from faucets, sudden pressure drops, muddy or sandy water, pump cycling rapidly, rising electric bills, and changes in water taste or smell. Any of these warrant a professional inspection.

Q: How much does it cost to fix a failing well?

It depends on the problem. Pressure tank replacement: $300–$1,200. Pump replacement: $1,000–$4,000. Well screen repair: $1,000–$3,000. New well cap: $100–$300. Deepening or drilling a new well: $5,000–$15,000+. Early detection saves thousands.

Q: How long do wells last?

A properly constructed and maintained well can last 25–50+ years. The well casing and screen are the longest-lasting components. Pumps last 8–15 years. Pressure tanks last 10–15 years. Regular maintenance extends all lifespans significantly.

Q: Should I repair or replace my well?

Repair makes sense for component failures (pump, tank, cap) and minor issues. Replace (drill new) when the well casing is severely corroded, the water table has permanently dropped below the well depth, or contamination sources cannot be eliminated. A well contractor can advise.

Wells do not fail overnight. They send warning signs first. If you catch them early, a $300 fix stays a $300 fix instead of a $5,000 emergency^[1].

Here are the 8 most common signs, what causes each, and what to do.

Quick Answer

The 8 warning signs: air sputtering, pressure drops, muddy/sandy water, higher electric bills, rapid pump cycling, water quality changes, well cap damage, and 10+ years without service. If you see any of these, act now — not next month^[2].

1. Air Sputtering from Faucets

If your faucets spit bursts of air mixed with water, the pump may be drawing air. This happens when the water level drops near or below the pump intake^[4].

Common causes: Drought lowering the water table. Pump set too shallow. A crack in the drop pipe above the water level.

What to do: Reduce water usage and let the well recover. If sputtering continues, call a well contractor to check the water level and pump depth.

Cost to fix: $200–$800 (pump lowering). $1,000–$4,000 (pump replacement if damaged).

2. Sudden Drop in Water Pressure

A sudden loss of pressure means something in the system cannot keep up with demand. If it happened gradually, the pump may be wearing out. If it happened overnight, check the pressure tank first^[5].

Common causes: Failed pressure tank bladder. Clogged sediment filter (a pre-filter that catches particles). Worn pump. Partially closed valve.

What to do: Check and replace sediment filters. Check pressure tank air charge. If pressure is still low, call a contractor.

Cost to fix: $15–$50 (filter replacement). $300–$1,200 (pressure tank). $1,000–$4,000 (pump).

3. Muddy or Sandy Water

Sediment (particles of sand, silt, or clay) in your water means something is letting particles into the system^[3].

Common causes: Damaged well screen. Corroded casing. Pump set too close to the bottom of the well. Drop in water level exposing sand layers.

What to do: Install or replace a sediment filter as a temporary fix. Call a contractor for a well camera inspection to find the source.

Cost to fix: $50–$150 (sediment filter). $1,000–$3,000 (well screen repair). $5,000–$15,000 (new well if casing has failed).

4. Higher Electric Bills

A failing pump draws more electricity. If your bill jumps with no other explanation, the well pump may be the cause^[1].

Common causes: Worn pump motor. Waterlogged pressure tank (pump runs constantly). Wiring problems.

What to do: Check if the pump runs more than usual. A clamp-on ammeter can measure power draw. Higher than rated = pump is struggling.

Cost to fix: $300–$1,200 (pressure tank). $1,000–$4,000 (pump). $100–$300 (electrical repair).

5. Pump Runs Constantly or Cycles Rapidly

Listen near your pressure tank. If the pump turns on and off every few seconds, the system is short-cycling. This burns out pumps fast^[2].

Common causes: Waterlogged pressure tank (bladder failed). Pressure switch malfunction. Leak in the plumbing between the well and the house.

What to do: Check the pressure tank first (tap test — hollow on top, full on bottom is normal). Check for visible leaks. Replace the tank if waterlogged.

Cost to fix: $300–$1,200 (pressure tank). $50–$150 (pressure switch). Varies (plumbing leak repair).

6. Water Quality Changes

New tastes, smells, or staining that were not there before signal a change in your water or a new contamination pathway^[6].

Warning signs:

New metallic taste → possible iron or manganese increase.
Rotten egg smell → hydrogen sulfide from bacteria or geology change.
New yellow color → tannins from decaying vegetation.
Soapy or chemical taste → possible surface water intrusion.

What to do: Test your water immediately. A sudden change often means a contamination pathway has opened — cracked casing, failed well cap, or a new source nearby.

7. Visible Well Cap Damage

The well cap seals your well from the outside world. A cracked, loose, or missing cap is an open door for contamination^[3].

Common causes: Weather damage. Impact from lawn equipment. Age and UV degradation. Rodent or insect entry.

What to do: Replace the cap immediately. A new well cap costs $100–$300 installed. Then shock chlorinate the well to disinfect.

8. Well Hasn't Been Serviced in 10+ Years

If your well has not been inspected or tested in over a decade, problems may be developing that you cannot see or taste yet.

Pumps are designed for 8–15 years^[1]. Pressure tanks last 10–15. If you have never replaced either, you are on borrowed time.

What to do: Schedule a professional inspection and full water panel test. Get a baseline for your system's condition. This costs $200–$500 and may prevent a $3,000+ emergency.

When to Call a Pro vs. DIY

Issue	DIY?	Call a Pro?
Replace sediment filter	Yes	No
Check pressure tank air charge	Yes	No
Replace well cap	Yes (if accessible)	Recommended
Replace pressure tank	Possible	Recommended
Replace pump	No	Yes
Well screen or casing repair	No	Yes
Shock chlorination	Possible	Recommended

What to Do Next

Seeing warning signs? Start with a water test and professional inspection. Our Testing Guide explains what to test for and where.

Need a new pump? Read our Best Well Pumps comparison.

Need a new pressure tank? See our Best Pressure Tanks review.

Want to prevent problems? Follow our Well Maintenance Schedule.

Frequently Asked Questions

How do I know if my well is going bad?

Watch for air sputtering, pressure drops, muddy water, rapid pump cycling, rising electric bills, and water quality changes. Any of these warrant a professional inspection^[2].

How much does it cost to fix a failing well?

Pressure tank: $300–$1,200. Pump: $1,000–$4,000. Well screen: $1,000–$3,000. New well: $5,000–$15,000+. Early detection saves thousands^[1].

How long do wells last?

A well casing can last 25–50+ years. Pumps last 8–15 years. Pressure tanks last 10–15 years. Regular maintenance extends all lifespans^[1].

Should I repair or replace my well?

Repair for component failures (pump, tank, cap). Replace when the casing is severely corroded, the water table has permanently dropped, or contamination cannot be eliminated^[5].

References

National Ground Water Association. "When to Service Your Well." 2024. https://www.ngwa.org
Water Systems Council. "Warning Signs: Is Your Well in Trouble?" 2024. https://www.watersystemscouncil.org
U.S. EPA. "Private Drinking Water Wells: Problems and Maintenance." 2024. https://www.epa.gov/privatewells
Penn State Extension. "Troubleshooting Private Water Systems." 2023.
Virginia Cooperative Extension. "Common Well Problems and Solutions." 2022.
CDC. "Well Water: Testing and Protecting Your Well." 2024. https://www.cdc.gov/healthywater/drinking/private