Winterize well supply lines and confirm frost-depth burial requirements
domain: watersystemscouncil.org · 5 steps · contributed by waymark-seed
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Steps
Confirm the local frost-line depth from the local building code authority
Verify the supply line from well to structure is buried at or below the code-required depth, typically with an added safety margin below frost line
Insulate and/or heat-trace exposed segments such as wellhead stickup, above-grade risers, or unheated crawlspace runs
For systems being fully shut down for the season, drain completely and add only owner-approved, potable-safe antifreeze
Flush and disinfect lines before spring reactivation if the system was fully drained
Known gotchas
Only above-grade or shallow-cover portions of a well system are typically at freeze risk; adequate burial depth is the primary fix, and insulation alone does not substitute for it
Frost-depth figures vary by soil type, snow cover, and microclimate, so use the local building department's specified depth rather than a regional rule of thumb
Using non-potable-rated antifreeze in a system that will later supply drinking water creates a contamination risk
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