Utility Bill ToolsHome cost calculators
Underground leak savings

Service Line Leak Water Bill Savings Guide

Check whether an underground or service-line leak could explain a high water bill before focusing only on indoor fixtures.

Estimate water savingsDiagnose the bill

Water bill

$114

Water use$46.00
Sewer$41.00
Service$27.00

All-in rate

$15.83 per 1k gal

Best next check

Leak and irrigation

First signal

When this guide fits

Water usage is high, indoor fixtures seem normal, and there may be wet spots, meter movement, or unexplained outdoor flow.

A service-line leak can waste water continuously and may be harder to spot than a toilet or faucet leak. It can also become expensive quickly.

Check first

  • Turn off indoor fixtures and check whether the meter still moves.
  • Look for wet soil, pavement, landscaping changes, or low pressure.
  • Compare gallons per day with a normal month.
  • Check whether the utility has leak adjustment rules.

Practical savings moves

  • Act quickly if the meter moves while all fixtures are off.
  • Document meter readings and dates before and after repair.
  • Ask the utility about leak adjustment or sewer adjustment policies.
  • Use the leak calculator to estimate the possible cost window.

Avoid these mistakes

  • Do not wait if the meter moves continuously with fixtures off.
  • Do not assume a hidden leak will be obvious indoors.
  • Do not forget that repair responsibility can depend on local rules and property lines.

Use these tools next

Service-line leak calculator

Estimate cost from leak flow, days, water rate, and sewer assumptions.

Open page

Water meter reading calculator

Use meter readings to confirm actual usage before and after repair.

Open page

Leak adjustment explained

Understand possible utility adjustment language on a water bill.

Open page

All home energy savings guides

Browse the manual guide index for appliance, leak, seasonal, and fixed-fee savings topics.

Open page

Water Meter Leak Test Savings Guide

Use a simple water meter check to decide whether a hidden leak, running toilet, irrigation issue, or service-line problem is raising the bill.

Open page

Toilet Leak Water Bill Savings Guide

Check whether a running toilet or bad flapper is quietly raising a water bill, then estimate the gallons and savings after repair.

Open page

Faucet Drip Water Bill Guide

Estimate whether a dripping faucet is raising water and sewer charges by checking drip rate, days, fixture location, and leak repair timing.

Open page

Hose Bib Leak Water Bill Guide

Estimate water bill impact from a leaking hose bib, outdoor spigot, stuck hose, frost damage, or slow outdoor drip.

Open page

FAQ

Short answers for search visitors and bill-checking moments.

Can an underground leak cause a high water bill?

Yes. A continuous service-line leak can add many gallons even when indoor fixtures appear normal.

What is the fastest first check?

Turn off fixtures and see whether the water meter still moves. Continuous movement is a strong leak signal.