Well Not Producing Enough Water? Here's Why

When your well's water production drops, it's a problem that only gets worse if ignored. Low yield affects water pressure, pump longevity, and your daily life. Understanding the cause helps determine the right solution—and whether you need professional help.

How Much Water Should Your Well Produce?

Before diagnosing a problem, know what's normal:

• Minimum household need: 3-5 GPM (gallons per minute)
• Comfortable household: 5-10 GPM
• Large household/irrigation: 10-20+ GPM

To measure your well's actual output: time how long it takes to fill a 5-gallon bucket. If it takes 60 seconds, you're getting 5 GPM. If it takes 2 minutes, you're only getting 2.5 GPM.

8 Common Causes of Low Well Yield

1. Dropping Water Table (Most Common During Drought)

During droughts or periods of heavy local pumping, the aquifer level drops. If your pump was set near the static water level, it may now be drawing air mixed with water.

Signs:

• Problem worse during dry months
• Sputtering or air in water
• Neighbors also experiencing issues

Solutions:

• Lower the pump deeper in the well ($500-$1,500)
• Install a storage tank to capture off-peak water
• Deepen the well ($3,000-$10,000)

2. Clogged Well Screen

Over years of use, mineral deposits, bacterial growth, or sediment can clog the screened portion of your well casing. This restricts water flow into the well.

Signs:

• Gradual decline over months/years
• Sand or sediment in water
• Well has never been rehabilitated

Solutions:

• Chemical rehabilitation ($1,000-$3,000)
• Mechanical brushing
• Hydrofracturing ($2,000-$5,000)

3. Failing Well Pump

Pump impellers wear down over time, reducing output. A pump that once delivered 10 GPM may now only produce 5 GPM.

Signs:

• Pump is 10-15+ years old
• Higher electricity bills
• Pump runs constantly
• Amp draw higher than rated

Solutions:

• Pump replacement ($1,500-$3,500 installed)

4. Biofouling (Iron Bacteria)

Iron bacteria create slimy buildup that clogs well screens, pumps, and pipes. This is very common in wells with high iron content.

Signs:

• Reddish-brown slime in toilet tanks
• Sulfur or sewage-like smells
• Oily sheen on standing water

Solutions:

• Shock chlorination ($200-$500)
• Ongoing treatment system ($500-$2,000)
• Professional well rehabilitation if severe

5. Mineral Encrustation

Calcium, iron, and manganese deposits build up on well screens and in the aquifer formation near the well, reducing permeability.

Signs:

• Hard water area
• White or orange scale buildup on fixtures
• Gradual yield decline

Solutions:

• Acidizing treatment ($1,000-$3,000)

6. Sediment Accumulation

Sand and sediment can fill the bottom of the well over time, reducing the productive zone and potentially burying the pump intake.

Signs:

• Sand in water
• Pump has been lowered before
• Old well with no recent maintenance

Solutions:

• Professional well cleaning ($500-$2,000)
• Well deepening if severe ($3,000-$10,000)

7. Damaged Well Casing

Cracked or corroded casing can allow sediment infiltration, reduce well integrity, or let surface water contaminate the well.

Signs:

• Old steel casing (20+ years)
• Sudden water quality changes
• Visible rust or corrosion

Solutions:

• Casing liner installation ($2,000-$8,000)
• New well if damage is severe ($15,000-$45,000)

8. Aquifer Depletion

In some areas, long-term groundwater extraction has permanently lowered water levels. This is a regional problem, not specific to your well.

Signs:

• Entire neighborhood/area affected
• Static water level significantly lower than when drilled
• Ongoing development in the area

Solutions:

• Deepen existing well ($3,000-$10,000)
• Drill new, deeper well ($15,000-$45,000)
• Install storage tank system ($2,000-$5,000)

How to Diagnose Your Low Yield Problem

Questions to Answer

1. Did yield drop suddenly or gradually?
   • Sudden → Pump failure, check valve issue, or electrical problem
   • Gradual → Screen clogging, pump wear, or dropping water table
2. Is it low all the time or just during heavy use?
   • All the time → Well or pump issue
   • Heavy use only → Well may be fine, just low-yield (storage tank can help)
3. How old is the pump?
   • Under 10 years → Likely not the pump
   • 10-15 years → Possible pump issue
   • Over 15 years → High probability pump is failing
4. Any water quality changes?
   • Sand in water → Pump set too low, screen clogged, or casing damaged
   • Slime in toilet → Iron bacteria clogging
   • Odor changes → Bacterial issues

Simple Tests You Can Do

1. Measure actual GPM: Time how long to fill a 5-gallon bucket
2. Check pump amp draw: Higher than nameplate indicates pump working harder
3. Measure actual output: Time how long to fill a 5-gallon bucket.
4. Check water level: Has static water level dropped?

Solutions by Cost (Low to High)

• Shock chlorination: $200-$500 — Treats bacterial clogging
• Pump lowering: $500-$1,500 — If water level has dropped
• Chemical rehabilitation: $1,000-$3,000 — Dissolves deposits
• Hydrofracturing: $2,000-$5,000 — Opens new fractures in rock
• Well deepening: $3,000-$10,000 — Access deeper water
• New well: $15,000-$45,000 — When rehabilitation isn't viable

Frequently Asked Questions