What is the most significant risk of not winterizing an irrigation system?

The most significant risk of not winterizing an irrigation system is freeze damage and burst pipes. During colder months, water left in the pipes can freeze as temperatures drop. When water freezes, it expands, which can cause the pipes to crack or burst. This not only leads to costly repairs but also results in significant water loss when the system is turned back on in the spring. Additionally, damaged components may require replacement, increasing maintenance efforts and expenses.

While increased maintenance costs and reduced water efficiency are valid concerns, they do not pose the immediate physical threat to the irrigation infrastructure that freeze damage does. Soil compaction is generally associated with heavy machinery or foot traffic rather than the condition of irrigation pipes in winter. Hence, the direct consequence of failing to protect the system against freezing temperatures is the most critical aspect to consider.