Why Is My Water Bill So High in Miami?

Before assuming the worst, rule out the most common — and cheapest to fix — causes. A running toilet is the single most common source of a surprise water bill spike, and it can waste over 200 gallons a day without ever overflowing or making an obvious sound. Check by listening closely at the tank, or drop a little food coloring in the tank and see if it appears in the bowl without flushing. A dripping faucet or an old washing machine supply line are the next most likely culprits.

If every fixture in the house checks out and the bill is still climbing, the leak is likely somewhere you can’t see — under the slab, inside a wall, or on an underground irrigation line. Miami’s slab-on-grade construction means a large share of supply plumbing runs beneath the foundation, completely out of sight, which is why a slab leak can run for weeks before anyone notices anything beyond the bill itself.

Irrigation and sprinkler line leaks are commonly overlooked for the same reason — homeowners assume a water problem must be indoors, when a leak underground on a sprinkler line can waste thousands of gallons on its own.