Most plumbing problems give no warning before they become expensive. A slow leak inside a wall causes months of hidden damage before it's visible. A corroded supply line fails without notice. Understanding how often to schedule professional plumbing inspections — and what those inspections should cover — is one of the most important things a homeowner can do to protect their property.

For most homes, a comprehensive plumbing inspection every two years is appropriate. Older homes with original galvanized steel or cast iron piping should be inspected annually due to the higher risk of corrosion and failure. Homes that have experienced water quality issues, slow drains, or unusual odors should be inspected immediately rather than waiting for a scheduled interval.

A thorough inspection covers water pressure and flow rates, supply line condition and valve operation, water heater performance and age, fixture function and seals, drain flow rates, and visible pipe condition in accessible areas. Some inspectors offer sewer camera inspection as an add-on, which is particularly valuable for homes over 20 years old with original sewer lines.

In Arizona, hard water is a significant plumbing concern. Maricopa County water typically runs above 300 parts per million in hardness, which accelerates scale buildup in water heaters, supply lines, and fixture aerators. Annual water heater flushing and periodic softener maintenance should be part of any plumbing maintenance routine in the Phoenix area.

Water heater inspection is particularly important. Most water heaters fail at or near the end of their rated service life — typically 8 to 12 years. A professional inspection identifies anode rod depletion, sediment buildup, and early signs of tank corrosion that indicate approaching failure. Replacing a water heater on a planned schedule is far less expensive and disruptive than emergency replacement after a failure.

If you're buying a home, a sewer scope inspection is strongly recommended regardless of home age. Tree root intrusion, offset joints, and deteriorated pipe material are common in homes of all ages and are not visible in a standard inspection. The cost of a sewer scope is typically $150 to $250 — a small investment compared to a sewer line replacement that can run $5,000 to $15,000.

Keep records of your plumbing inspections, repairs, and any upgrades made to the system. This documentation is valuable when selling and helps a new buyer understand the maintenance history of the home's systems.