A sewer bill that suddenly jumps or consistently runs higher than expected points to either increased water use, billing errors, infrastructure problems, or rate changes you might not have noticed. Understanding what drives your sewer charges helps you identify the problem and take action to lower costs.
This guide walks you through the most common reasons for high sewer bills, how to check for issues in your system, and practical steps to reduce what you pay each month.
Why Is My Sewer Bill So High?
Your sewer bill is likely high because sewer charges are based on your water consumption, and any increase in water use, leaks, seasonal adjustments, or rate hikes directly raises the bill. Many municipalities also add fixed fees, stormwater charges, and infrastructure surcharges that compound over time, making the total higher than the base rate suggests.
How Sewer Billing Actually Works
Most sewer bills are calculated based on the volume of water entering your home, measured in gallons or cubic feet. The assumption is that nearly all water you use goes down the drain and into the sewer system.
Some municipalities use your winter water consumption to set a flat monthly sewer charge for the entire year. This method assumes you use less outdoor water in winter, giving a more accurate picture of indoor water that enters the sewer.
Fixed Fees and Additional Charges
Your bill may include a base service fee regardless of usage. Many cities also add stormwater management fees, capital improvement charges, or regional district fees that can double the line items on your statement.
These fees fund infrastructure maintenance and expansion. They appear as separate charges but are often grouped under “sewer and water services,” making it hard to see where the cost comes from.
Common Causes of a High Sewer Bill
Water Leaks Inside Your Home
A running toilet, dripping faucet, or leaking water heater can waste thousands of gallons per month. Because sewer charges follow water use, every gallon lost to a leak increases both your water and sewer bills.
Check toilets by adding food coloring to the tank. If color appears in the bowl within 15 minutes without flushing, the flapper valve is leaking and needs replacement.
Outdoor Irrigation and Seasonal Use
If your sewer bill is calculated on total water use rather than winter baseline, watering your lawn or filling a pool will raise your sewer charges even though that water never enters the sewer. Some municipalities offer outdoor meter installations or seasonal adjustments to exclude irrigation from sewer billing.
Contact your utility to ask whether you can apply for an irrigation meter or a summer sewer cap. These programs vary by location but can save hundreds of dollars during growing season.
Increased Household Water Use
More people at home, longer showers, additional laundry loads, or a new dishwasher cycle all add up quickly. Compare your current water usage in gallons to previous months or the same period last year to spot changes.
Your bill should list usage by billing cycle. Look for a sudden spike that corresponds to a change in routine or occupancy.
Sewer Rate Increases
Cities raise sewer rates regularly to fund aging infrastructure, compliance with environmental regulations, and system expansions. These increases may phase in gradually or arrive as a single adjustment approved by a city council or utility board.
Check your municipality’s website or contact customer service to review the current rate schedule and any recent changes. You may also find public meeting minutes explaining why rates went up.
Billing Errors or Meter Misreads
Manual meter reads can be recorded incorrectly, or estimated bills can overstate your actual usage. If your bill jumps without an obvious cause, request a meter reread or ask to see the usage history for the past year.
Some utilities allow you to submit your own meter reading online to correct an error before the next billing cycle.
Sewer Lateral Problems
A crack, root intrusion, or collapsed section in the sewer lateral (the pipe connecting your home to the main line) does not usually increase your bill directly. However, if a leak allows groundwater or stormwater to enter the pipe, the added flow can register on a sewer system meter in some jurisdictions.
This situation is uncommon in residential billing but worth investigating if you notice persistent drainage issues, soggy patches in the yard, or sewer backups.
How to Investigate Your Sewer Bill
Compare Water and Sewer Charges Line by Line
Pull out several months of bills and list your water usage, sewer volume charge, base fees, and any extra line items. Look for patterns, such as sewer charges that rise even when water use stays flat, which suggests a rate change or new fee.
Many utilities post rate calculators online. Enter your usage to see if the math matches your bill.
Check Your Water Meter for Hidden Leaks
Turn off all water-using appliances and fixtures inside and outside your home. Locate your water meter and note the reading or watch the flow indicator.
Wait 30 minutes without using any water. If the meter moves, you have a leak somewhere between the meter and your fixtures.
Review Your Household Water Habits
Track how many loads of laundry you run, how often you water plants, and how long showers last. Small changes in behavior, especially when multiplied across several people, can account for noticeable usage increases.
Consider whether you recently started working from home, have guests staying longer, or installed a water feature or second bathroom.
Request a Meter Test
If you believe your meter is reading high, contact your utility to request a formal meter test. Most municipalities perform this service for a small fee, which is refunded if the meter proves inaccurate.
A meter running more than a few percentage points fast or slow will be replaced, and your bill may be adjusted retroactively.
Practical Ways to Lower Your Sewer Bill
Fix Leaks Immediately
Replace worn flappers, gaskets, and valve seats as soon as you detect a leak. A toilet flapper costs less than ten dollars and takes minutes to install, yet a leaking toilet can waste 200 gallons per day.
For leaks in concealed pipes or water heaters, hire a licensed plumber to assess and repair the problem before it worsens.
Install Low-Flow Fixtures
Switching to low-flow showerheads, faucet aerators, and WaterSense-labeled toilets reduces water use without sacrificing performance. These fixtures lower both your water and sewer bills because less water enters the system.
Check with your utility for rebate programs that offset the cost of water-efficient appliances and fixtures.
Apply for Billing Adjustments
If you had a documented leak or filled a pool, ask your utility if they offer a one-time sewer billing adjustment. Many municipalities will reduce your sewer charge for the affected period if you provide a plumber’s invoice or other proof that the water did not enter the sewer.
Policies vary, so call customer service and ask whether your situation qualifies.
Reduce Overall Water Consumption
Shorten showers, run full loads in the dishwasher and washing machine, and turn off taps while brushing teeth or washing dishes. Small habit changes across a household can cut water use by 10 to 20 percent.
Monitor your usage each billing cycle to see whether the changes translate to lower charges.
Install a Separate Irrigation Meter
A dedicated outdoor meter measures only the water used for landscaping, which does not enter the sewer. Your utility will bill you for that water at the water rate but exclude it from sewer charges.
Installation requires a licensed plumber and a permit in most areas. The upfront cost is typically recouped within one to three years if you irrigate heavily during warm months.
Advocate for Fair Rate Structures
Attend city council or utility board meetings when sewer rate increases are on the agenda. Public input can influence whether rates rise, how increases are phased, and whether low-income assistance programs are expanded.
Many communities offer hardship programs, senior discounts, or tiered rates that reward conservation. Ask whether you qualify.
When to Call a Professional
If you cannot locate a leak but your meter shows continuous flow, hire a licensed plumber to inspect your system. Hidden leaks in slab foundations, crawlspaces, or underground lateral lines require specialized detection equipment.
For sewer lateral issues such as root intrusion, cracks, or collapsed sections, a plumber can perform a camera inspection and recommend repair or replacement. Never attempt to excavate or repair a sewer lateral yourself without checking local codes and obtaining required permits.
Understanding Stormwater and Infrastructure Fees
Stormwater fees fund drainage systems, flood control, and water quality programs. These charges are often based on the amount of impervious surface on your property, such as rooftops, driveways, and patios.
Some municipalities allow credits if you install rain gardens, permeable pavement, or rain barrels that reduce runoff. Check your local stormwater utility website for credit applications and eligible projects.
Reviewing Your Bill for Accuracy
Sewer bills should clearly separate water volume charges, sewer volume charges, base fees, and any additional line items. If your bill lists only a combined total or uses vague descriptions, request an itemized statement.
Compare the rate per gallon or cubic foot to the published rate schedule. Billing software errors do occur, and catching them early can result in refunds or credits.
Take Control of Your Sewer Costs
A high sewer bill usually stems from increased water use, leaks, rate hikes, or billing errors, all of which you can investigate and address. Start by reviewing your bill line by line, checking for leaks, and comparing your usage to past months.
Fix any leaks, consider water-saving fixtures, and contact your utility to ask about adjustments, rebates, or separate irrigation meters. Taking these steps now will lower your bill and help you avoid surprise charges in the future.
We hope this guide helps you understand and reduce your sewer costs. Explore more helpful Home and Garden articles to make your home more efficient and comfortable.