Your water bill was $75 last month and $150 this month. Before assuming that you have a major leak or a faulty meter, find out what actually doubled. It could be water consumption, the price of service, a sewer adjustment, or simply the total amount due after an unpaid balance was added.

Step 1: Identify Which Part of Your Water Bill Doubled

Find the consumption, current charges, and total amount due on both statements.

Step 2: Reconstruct a $75-to-$150 Water Bill

Here is a hypothetical example showing how a bill can double because of both increased consumption and changes in charges.

The $75 increase breaks down as follows:

The increase is not caused by a single line item. Both higher consumption and changes in charges contributed.

These amounts are illustrative, not actual utility rates. Sewer billing methods vary and may not use the same volume as the current water meter reading.

Step 3: Compare Daily Usage, Not Just Monthly Totals

If your billing periods are different lengths, compare gallons used per day.

Although total consumption increased by 50%, daily consumption was unchanged. The longer billing period explains the volume difference.

For a genuinely doubled bill, billing days may explain part of the change but should not be assumed to explain everything.

Step 4: Reconcile Your Water Meter Readings

Look for the previous reading, current reading, meter-reading dates, and unit of measurement.

For a meter billed directly in gallons, a simple example is:

If the bill lists 10,000 gallons, these readings reconcile. If it lists 20,000 gallons, ask the utility whether a multiplier, correction, or another reading was used.

Some utilities bill in CCF rather than gallons. According to the EPA, one CCF equals approximately 748 gallons.

Check whether either reading was estimated. A later actual reading may correct an earlier estimate, resulting in an unusually high statement.

Step 5: Determine Whether a Leak Could Explain the Increase

If daily consumption genuinely increased, investigate unintended water use.

Start with toilets, faucets, outdoor taps, irrigation equipment, and accessible plumbing.

Simple No-Use Meter Test

1. Choose a period when no one will use water.
2. Make sure dishwashers, washing machines, toilets, and irrigation systems will remain inactive.
3. Record the water-meter reading.
4. Wait two hours without using water.
5. Read the meter again.

If the reading changes, investigate a possible leak or another source of water flow.

The EPA WaterSense program describes this general approach to detecting household leaks.

Could a Small Continuous Leak Double Your Bill?

Suppose an unnoticed leak flows at 0.10 gallons per minute for 30 days.

At a hypothetical combined variable water-and-sewer charge of $12 per 1,000 gallons, that extra volume would add approximately $51.84 before any other applicable adjustments.

The example illustrates why even a relatively small continuous leak can matter. It does not establish that your household has a leak.

For a complete leak-detection walkthrough, see Why Is My Water Bill So High?.

Step 6: Investigate Sewer Charges Separately

Water and wastewater charges may be billed together, but they are not always calculated in the same way.

Some utilities use the current water-meter reading to estimate wastewater volume. Others may use winter averaging, a separate measurement, or a fixed charge.

Ask the utility:

• What sewer volume was used on this statement?
• Was it based on current usage or an earlier averaging period?
• Did the wastewater rate change?
• Was a sewer adjustment or catch-up charge applied?
• Is there a leak-adjustment policy for water or sewer charges?

The EPA explains that water bills may contain both fixed and volume-based charges, and that sewer-related billing can be connected to measured water consumption.

Step 7: Check Whether Only the Amount Due Doubled

A bill may show $150 due even when current-period water and sewer charges remain at $75.

In this example, the current service charges did not increase at all. The doubled amount due results from an unpaid balance and fee.

Compare current charges with current charges, not one month’s current charges with another month’s total amount due.

What If Your Water Bill Doubled but Usage Stayed the Same?

If both bills show approximately the same gallons or CCF, concentrate on changes to water rates, sewer rates, fixed charges, credits, and adjustments.

For a dedicated charge-by-charge comparison, see Water Bill High but Usage Is the Same?.

That guide explains how to reconcile two statements when water consumption has not increased.

How to Request a Formal Water-Bill Review

If the figures still do not make sense, contact the water utility using the official number on your statement.

Keep copies of both statements and record the date, representative’s name or reference number, and the explanation provided.

If the utility identifies a leak, ask whether a leak-adjustment program is available. Eligibility and documentation requirements vary by provider.

If the dispute remains unresolved, ask which local or state authority handles complaints about that specific utility. Municipal utilities, private water companies, and other providers may have different oversight arrangements.

Water Bill Doubled: Final Diagnostic Checklist

Official Sources and Methodology

All dollar amounts, meter readings, and consumption examples in this article are hypothetical calculations created to demonstrate billing diagnosis. They are not actual customer statements or official utility tariffs.

• U.S. EPA WaterSense — Understanding Your Water Bill
• U.S. EPA WaterSense — Fix a Leak Week
• U.S. EPA — Water Affordability Resources

Editorial review: October 11, 2026. BillUnpacked is an independent consumer-information website. Water billing policies, rate structures, and dispute procedures vary by utility and location.