Guide · 3 steps · ~2 min read
Toilets: fix or replace.
The biggest indoor saver in the house.
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Step 1
Fix first
Most running toilets are a flapper problem.
A running toilet is often the #1 silent indoor leak.
Confirm with a timed toilet dye test before you replace the whole fixture.
Toilet dye test -
Step 2
Upgrade when it’s time
Look for the WaterSense label when replacing. [1]
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Step 3
Plan the swap
Run the numbers before you buy so the payback is obvious.
Run the toilet calculator
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Educational estimates, not professional advice. Sources linked below.
Related diagnosis guides
Keep one primary page per question. These siblings cover the rest of the high-intent set.
Why is my water bill so high?
National diagnosis: usage vs rates vs sewer vs silent leaks.
Silent toilet leak cost
Dye-test, size the waste, fix the flapper before upgrading.
Leaky faucet drip cost
Drip Meter: drips/min → gallons → $/month bill proof.
Sprinkler / irrigation timer spike
Stuck schedules and broken heads before indoor gadgets.
Sudden high water bill
Bill jumped out of nowhere? Four causes, checked in order.
Compare bills month over month
Units per day — not dollars — when the total lies.
Estimated meter read true-up
Catch-up dump after a low estimated read.
Pool fill sewer credit
Gallons you keep vs sewer you may credit.
How water meter reads work
Set dials, match the bill, catch misreads.
Why water pressure fluctuates
24h timeline: municipal demand vs internal pipe/pump.
Toilet dye test
Drop-timer: Slow seep vs Fast waste gal/day.
How runoff retention changes your stormwater bill
Stormwater/impervious fee — Drainage Delay over 48h.
Did a hose timer leave outdoor water on your bill?
Quiet house, jumping bill — check the outdoor timer.
Pressure reducer (PRV) check
Municipal vs recommended PSI — age the valve, size waste.
Why is my water pressure low?
Whole house vs one fixture — name the cause before you call.
Why is my water billing estimated?
Safe Zone vs Shock Zone — prior actual vs this estimate.