#3482 · Energy & Environment Tool

Leak Detection Water Savings Calculator

Estimate how much water and money can be saved by finding and repairing a persistent leak sooner. Enter the observed flow, operating schedule, days avoided, water rate, and repair effectiveness. Results show recoverable water, gross utility savings, and the remaining leakage after repair, helping prioritize detection and maintenance work.

Calculator

Leak duration and utility cost
gpm
Average leak flow before repair.
hr/day
Hours the line is pressurized each day.
days
Time saved by earlier detection and repair.
%
Share of leak flow eliminated.
$/1,000 gal
Water and sewer charge per thousand gallons.

How to use this calculator

  1. Enter the measured or planning values for this scenario.
  2. Check that every unit matches the label shown beside its field.
  3. Select Calculate to update the result and supporting metrics.
  4. Compare the result with site capacity, cost, or performance targets.
  5. Use Reset to restore the documented example assumptions.

Formula

Gross leak volume = gpm × 60 × hours/day × days avoided. Water saved = gross volume × repair effectiveness. Utility savings = water saved ÷ 1,000 × rate.

What the result means

Water saved reflects only the portion of flow the repair actually eliminates during the avoided leak period. Cost savings use the entered marginal water and sewer rate and exclude repair labor, damage, and production effects.

Use the marginal volumetric rate from the bill. Fixed service charges generally do not fall when consumption decreases.

Example calculation

A 2.5 gpm leak operating 24 hours daily for 30 avoided days loses 108,000 gallons. At 95% repair effectiveness, 102,600 gallons are saved. At $12 per 1,000 gallons, estimated utility savings are $1,231.20.

Tips for better results

  • Confirm whether sewer charges also decline when water use falls.
  • Use actual pressurized hours for intermittent equipment.
  • Estimate repair effectiveness from post-repair meter readings.
  • Separate fixed and volumetric utility charges.
  • Include avoided treatment or pumping costs in the rate only once.

Frequently asked questions

How many gallons does a 1 gpm leak waste per day?

A continuous 1 gpm leak wastes 1,440 gallons in 24 hours.

Why does the calculator ask for repair effectiveness?

Some repairs reduce rather than fully eliminate leakage, so effectiveness prevents overstating savings.

Should I include sewer charges in the water rate?

Include marginal sewer charges only when they change with the reduced water volume.

Can I use a monthly billing period for days avoided?

Yes. Enter the actual number of avoided days in that billing or planning period.

Does utility savings include the repair cost?

No. The result is gross utility savings before repair labor, materials, and downtime.

Calculation inputs and logic

InputExamplePurpose
Leak rate2.5 gpmPre-repair flow
Operating schedule24 hr/dayPressurized time
Repair effectiveness95%Eliminated share
Utility rate$12/1,000 galMarginal charge

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