InterNACHI Standards of Practice

Our plumbing inspections follow InterNACHI Standards of Practice, thoroughly evaluating water supply systems, drainage systems, fixtures, water heaters, and all visible plumbing components. We identify leaks, defects, safety hazards, and code violations.

What We Inspect in Your Plumbing System

Water Supply System

Main water shut-off valve location and operation
Water supply line material (copper, PEX, galvanized, polybutylene)
Pipe condition and visible leaks
Water pressure testing
Supply line routing and support
Water meter and shut-off accessibility
Well system components (if applicable)
Water softener and filtration (if present)
Corrosion and deterioration

Drain, Waste & Vent (DWV) System

Drain pipe material (PVC, ABS, cast iron, galvanized)
Visible drain line condition
Proper slope and drainage
Vent pipe routing and termination
Trap configuration and operation
Cleanout access points
Signs of backups or slow drainage
Sewer line concerns (where visible)

Fixtures & Faucets

Sink, tub, and shower operation
Faucet condition and leaks
Hot and cold water function
Toilet operation and flush mechanism
Toilet tank components and leaks
Shower/tub diverters and valves
Fixture mounting and stability
Caulking and water-tightness

Water Heater (Basic Inspection)

Water heater type, age, and capacity
Temperature and pressure relief (TPR) valve
TPR discharge pipe routing
Venting (gas water heaters)
Gas connections and shut-off valve
Expansion tank (if required)
Signs of leaks or corrosion
Proper clearances and installation

Additional Components

Sump pump operation and discharge
Laundry connections and drain
Hose bibs and outdoor faucets
Water hammer arrestors
Sediment filters and treatment systems
Floor drains and functionality
Backflow prevention devices

Common Plumbing Issues in Minnesota

Galvanized Steel Pipes

Common in pre-1970 homes, galvanized pipes corrode internally, reducing water pressure and causing rust-colored water. Eventually require complete replacement with copper or PEX.

Polybutylene Piping

Used 1978-1995, polybutylene pipes are prone to sudden failure and leaks. Insurance companies often won't cover homes with polybutylene. Replacement strongly recommended.

Frozen Pipe Damage

Minnesota winters cause frozen pipes, especially in exterior walls, crawl spaces, and unheated areas. We identify vulnerable pipes and recommend insulation or rerouting.

Sewer Line Tree Roots

Tree roots infiltrate older clay or cast iron sewer lines, causing backups and slow drains. We recommend camera inspection if drainage concerns exist.

Water Heater Age & Condition

Water heaters typically last 8-12 years. Older units risk sudden failure and water damage. We assess age and condition for replacement budgeting.

Improper Drain Venting

Missing or improperly installed vent pipes cause slow drains, gurgling sounds, and sewer gas odors. Proper venting is essential for drainage function.

🚩 Critical Red Flags We Look For

Polybutylene Piping: High failure risk requiring complete replacement
Severely Corroded Galvanized Pipes: Low pressure and imminent failure
Active Water Leaks: Causing damage and requiring immediate repair
No TPR Valve on Water Heater: Safety hazard - risk of explosion
Improper TPR Discharge: Discharge pipe terminates improperly or missing
Sewage Backups: Evidence of sewer line failure or blockage
Lead Supply Pipes: Health hazard requiring replacement
Non-Functional Main Shut-Off: Cannot stop water in emergency

Plumbing Maintenance Tips for Minnesota Homeowners

Know Your Main Shut-Off: Locate and test main water valve annually
Drain Outdoor Faucets: Disconnect hoses and shut off exterior faucets before winter
Insulate Exposed Pipes: Protect pipes in crawl spaces, attics, and exterior walls
Test TPR Valve Annually: Lift lever on water heater's relief valve to verify operation
Flush Water Heater Annually: Drain sediment to extend lifespan and efficiency
Clean Aerators: Remove mineral deposits from faucet aerators regularly
Check for Leaks: Inspect under sinks, around toilets, and at fixtures monthly
Avoid Chemical Drain Cleaners: Use mechanical methods or professional help instead

Frequently Asked Questions

What is polybutylene piping and why is it a problem?

Polybutylene (PB) is gray or white plastic piping used 1978-1995. It deteriorates when exposed to chlorine and oxidants in municipal water, causing sudden failure and floods. Many insurance companies refuse coverage for homes with polybutylene. Complete replacement with PEX or copper is strongly recommended.

How long do galvanized pipes last?

Galvanized steel pipes typically last 40-70 years but corrode internally over time, restricting water flow. Homes built before 1970 with original galvanized plumbing often have reduced water pressure, rust-colored water, and leaks. Complete replacement is typically necessary.

Can you camera inspect sewer lines?

We don't perform sewer camera inspections during standard home inspections, but we recommend specialized sewer inspections when we observe slow drains, backups, or homes with older clay/cast iron sewer lines. Sewer inspections identify tree roots, breaks, and deterioration.

What causes frozen pipes in winter?

Pipes in unheated spaces (crawl spaces, attics, exterior walls, garages) freeze when temperatures drop below 20°F. We identify vulnerable pipes and recommend insulation, heat tape, or rerouting. Always disconnect garden hoses and shut off exterior faucets before winter.

How long do water heaters typically last?

Standard tank water heaters last 8-12 years. Factors affecting lifespan include water quality, maintenance, and usage. We assess age (check serial number), condition, and signs of deterioration. Budget for replacement when water heaters exceed 10 years old.

Serving Winthrop & Surrounding Communities

Winthrop, MN

Gaylord, MN

Lafayette, MN

New Ulm, MN

Gibbon, MN

Fairfax, MN

Sleepy Eye, MN

Springfield, MN

Glencoe, MN

Hutchinson, MN

Arlington, MN

Green Isle, MN

Brownton, MN

Stewart, MN

Bird Island, MN

Schedule Your Professional Plumbing Inspection Today

InterNACHI-certified inspector serving Winthrop and surrounding areas

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🚰 Plumbing Inspection - What We Check