Well Casing Problems: Signs, Causes & Repair Options

What Well Casing Does

Critical Functions

• Keeps well hole open
• Prevents collapse of borehole walls
• Seals out surface water and contaminants
• Provides structural support for pump
• Separates aquifer from surface

Casing Materials

• Steel: Most common, durable but can corrode
• PVC: Corrosion resistant, less structural strength
• Stainless Steel: Expensive but corrosion resistant
• Concrete/tile: Older wells

Why Condition Matters

Failed casing means:

• Surface contamination enters well
• Bacteria and pathogens reach water
• Sand and sediment get in
• Well may lose water or fail completely

Signs of Casing Problems

Water Quality Changes

• Sudden cloudiness or turbidity
• New tastes or odors
• Color changes
• Bacteria appearing in tests
• Nitrates or other surface contaminants

Physical Symptoms

• Sand or sediment in water
• Grit in fixtures and appliances
• Pump screen clogging
• Pump wearing out faster

Performance Issues

• Declining yield (less water)
• Water level changes unexplained by drought
• Pump cavitation or air in lines

Visible Signs

• Wellhead tilting or sinking
• Cracks or corrosion visible at surface
• Cap doesn't seal properly
• Ground settling around wellhead

Causes of Casing Damage

Corrosion

• Most common cause of failure
• Aggressive water chemistry accelerates
• Low pH (acidic) water is worst
• Galvanic corrosion from dissimilar metals
• External corrosion from soil conditions

Age

• Steel casing lifespan: 25-50+ years (varies)
• Older wells more prone to problems
• Original construction quality matters

Physical Damage

• Ground movement or settling
• Earthquakes
• Vehicle impact at wellhead
• Construction damage nearby
• Improper pump installation

Poor Construction

• Inadequate grouting (seal)
• Wrong casing material for conditions
• Insufficient casing depth
• Joints improperly sealed

Environmental Factors

• Corrosive soils
• High water table changes
• Flooding
• Nearby contamination sources

Diagnosis

Water Testing

• Bacteria test (coliform, E. coli)
• Nitrates (surface contamination indicator)
• Full panel if concerns
• Repeated positive bacteria = structural issue

Camera Inspection

• Downhole video shows actual casing condition
• Reveals location and extent of damage
• Shows corrosion, holes, cracks
• Essential before deciding repair vs replace
• Cost: $300-$600

Yield Testing

• Pump test reveals performance
• Compare to original yield
• Can indicate structural changes

Repair Options

Casing Liner (Sleeve)

• New pipe installed inside existing casing
• Seals damaged sections
• Works for localized corrosion/holes
• Reduces well diameter slightly
• Cost: $2,000-$8,000

Patching

• For small, localized holes
• Various methods depending on damage
• Not always possible or durable

Well Rehabilitation

• Clean, treat, and improve existing well
• May include new casing sections
• Address multiple issues together
• Cost: $3,000-$10,000

New Well

Required when:

• Casing extensively deteriorated
• Structural collapse
• Multiple failures throughout
• Repair cost approaches replacement cost
• Cost: $15,000-$50,000+

Decision Factors

Prevention

Protect the Wellhead

• Keep cap secure and sealed
• Maintain proper grade (slope away)
• No vehicles near wellhead
• Protect from impact

Annual Inspection

• Check wellhead condition
• Look for settling or movement
• Test water quality annually

Address Water Chemistry

• Treat acidic water (pH neutralizer)
• Reduces internal corrosion
• Extends casing life

Proper Well Records

• Keep original well log
• Document repairs and inspections
• Know casing material and depth

We service all major pump brands including Franklin Electric, Grundfos, Goulds (Xylem), and Sta-Rite (Pentair). Our trucks carry common parts and components for same-day repairs.

Frequently Asked Questions

What are signs of well casing failure?

Water quality changes (bacteria, cloudiness), sand in water, declining yield, visible damage at wellhead. Camera inspection confirms.

Can well casing be repaired?

Often yes, with a liner or patching. Severe or widespread damage usually requires new well.

How long does well casing last?

Steel casing: 25-50+ years depending on water chemistry and soil conditions. PVC is more resistant to corrosion.

How much does casing repair cost?

Liner: $2,000-$8,000. Rehabilitation: $3,000-$10,000. Compare to new well at $15,000-$50,000+.

Should I abandon a well with bad casing?

Depends on repair viability and cost. Get camera inspection first. If abandoning, proper sealing is required by code.