Evaluating Plumbing and Drainage Systems: Home Inspector's Checklist

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When it comes to assessing the overall condition of a home, the plumbing and drainage systems are of utmost importance. As a crucial aspect of a home inspection, evaluating these systems requires a comprehensive approach. In this blog, we'll provide a detailed home inspector's checklist for assessing plumbing and drainage systems. While the business website, OM Inspections Inc. in Toronto, ON, offers expert home inspection services, this article focuses on generic information to guide homeowners and potential buyers.


Plumbing System Inspection

Water Supply

Inspect the water supply system to ensure that it is functioning properly. Check for leaks, pressure issues, and assess the condition of pipes, valves, and faucets.

Water Heater

Evaluate the water heater's condition, age, and capacity. Look for signs of corrosion, leaks, or inadequate heating. Ensure it is installed and vented correctly.

Drainage and Ventilation

Examine drainage and ventilation systems to confirm they are effectively removing wastewater and sewer gases. Check for blockages, improper connections, and any signs of sewer gas odors.

Exterior Plumbing Inspection

Outdoor Faucets

Inspect outdoor faucets and hoses for leaks and proper functioning. Ensure that they are not frozen or damaged, especially in colder climates.

Irrigation Systems

If the property has an irrigation system, assess its condition and functionality. Look for leaks, broken sprinklers, and proper drainage.

Sewer Cleanouts

Locate and inspect sewer cleanouts to ensure they are accessible and free from obstructions. These access points are crucial for addressing sewer line issues.

Bathroom and Kitchen Inspections


Check toilets for proper flushing, leaks, and any signs of water damage around the base. Confirm that they are securely fastened to the floor.

Sinks and Faucets

Examine sinks and faucets in bathrooms and kitchens for leaks, adequate water pressure, and proper drainage. Look for signs of water stains or mold.

Drains and Traps

Inspect drainpipes and traps for clogs, corrosion, or damage. Ensure that they are connected correctly and that water flows freely.

Basement and Crawl Space Plumbing

Sump Pump

Evaluate the sump pump (if present) for proper operation. Check the pump, float switch, and discharge pipe for any issues.

Pipes and Insulation

Inspect exposed plumbing pipes in basements and crawl spaces for signs of leaks, corrosion, or inadequate insulation. Address any moisture or insulation concerns.

Backflow Prevention

Check for backflow prevention devices on plumbing systems to protect against contaminated water. Ensure they are in good working condition.

Drainage System Assessment

Gutters and Downspouts

Inspect gutters and downspouts for clogs, damage, and proper drainage. Ensure that they direct water away from the foundation to prevent water damage.

Grading and Drainage

Assess the grading around the property to confirm that it slopes away from the foundation. Proper grading prevents water from pooling around the home, which can lead to foundation issues.

French Drains

If the property has a French drain system, inspect it for functionality and signs of clogs. Ensure that it is diverting groundwater away from the foundation.


A thorough evaluation of plumbing and drainage systems is a crucial aspect of a home inspection. Addressing issues related to these systems early can prevent costly repairs down the road. For professional home inspection services tailored to your needs, contact OM Inspections Inc. today. Our team is dedicated to providing comprehensive and reliable home inspections to ensure the safety and functionality of your property. We specialize in expert home inspection services, this checklist provides valuable guidance for homeowners and potential buyers.

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