How to Winterize Your Lake Home Plumbing at Lake of the Ozarks

By lozplumbers.com Editorial Team  ·  Updated June 2026  ·  6 min read

Winterizing the plumbing in a Lake of the Ozarks vacation home is one of the most important maintenance tasks an owner can perform before leaving for the season. Missouri winters bring freeze-thaw cycles severe enough to burst supply lines, crack water heaters, and split fixture bodies in unheated structures that sit vacant for weeks or months at a time. A properly executed winterization costs a few hundred dollars and takes two to three hours. A burst pipe that goes undetected in an empty cabin can cost tens of thousands of dollars in water damage and mold remediation.

Why Winterization Is Critical at LOZ

Lake of the Ozarks sits in central Missouri where January temperatures regularly drop below 10 degrees Fahrenheit and occasionally reach zero or below. Water remaining in supply lines, fixtures, water heaters, and toilet tanks will freeze and expand under these conditions, splitting copper or PVC pipe at joints and connections where pressure concentrates. The damage is often invisible until the property is reopened in spring and water is restored, at which point the frozen-then-thawed pipes fail and flood the structure. Crawlspaces under many older LOZ cabins are minimally insulated, making supply lines in those spaces especially vulnerable even during a brief cold snap.

Vacation properties that sit unoccupied for extended periods from October through March represent the highest risk category in the LOZ market. Properties without active heat present the greatest freeze danger, but even heated cabins set at minimal temperatures during vacancy can experience pipe failures in crawlspaces or exterior walls that are not adequately protected from outside air. Professional winterization by a licensed plumber eliminates this risk and is recommended over self-service approaches for vacation homes where the owner may not be able to respond quickly if something goes wrong during a winter storm.

The Full Winterization Process

A complete plumbing winterization at Lake of the Ozarks involves several sequential steps that must be completed in the correct order. The process begins with shutting the main water supply valve at the meter or pressure tank. All faucets, both hot and cold, are then opened throughout the house to relieve pressure and begin draining supply lines. Toilets are flushed and the tank interior is mopped dry, then a small amount of non-toxic RV antifreeze is added to the bowl trap to prevent the water seal from freezing. The same antifreeze is added to sink and shower drains to protect those traps.

Water heaters must be drained completely, as a tank left with water in a frozen structure will crack the tank lining or damage the heating elements when the water freezes. Electric water heaters should be switched off at the breaker before draining. Propane-fueled water heaters should be shut off at the gas valve. A compressed air blow-out of supply lines using a small compressor forces residual water out of low points in the line that gravity draining misses. Any irrigation systems, outdoor hoses, and hose bibs must also be shut off and drained as part of the complete winterization process.

Spring Startup After Winterization

Reopening a winterized LOZ lake home in spring requires a careful, sequential process that reverses each step of the winterization. Begin by closing all faucets and drains that were left open during winterization. Restore power to the water heater and allow the tank to fill completely before switching the heating element or pilot light back on. Partially filled water heaters that are energized will burn out heating elements in electric models or create excessive heat in tank walls on gas models.

Restore main water supply slowly and walk through the structure listening and looking for leaks at every fixture, connection, and shutoff valve. Inspect crawlspace supply lines and the water heater for any signs of stress cracking or joint failure that may have occurred during the winter even if full burst pipes did not result. Check outdoor hose bibs for flow and drip at the handle seals. A spring startup inspection by a licensed plumber takes one to two hours and identifies any winter damage before walls or ceilings are closed back up. In the LOZ market, plumbers in Camdenton and Osage Beach book spring startup appointments quickly in March and early April, so scheduling in advance is recommended.

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