TL;DR
Watch for gradual yield loss, sandy or rust-colored water, short-cycling pumps, sulfur odors, and rising drawdown. Most of these point to mineral encrustation or biofouling — both fixable by rehabilitation rather than replacement.
Summary
Falling yield, sandy water, iron stains, or short-cycling pumps? These ten signs usually mean your Utah well needs rehabilitation, not replacement. Here's how to tell.