Why Is My Sewer Bill So High? Check the Math and Lower It
Your sewer bill is so high because of the formula behind it: a winter average set during a leak, a rate on every metered gallon, or a fixed charge that rose. The same 6,000 gallons costs $29.04, $71.60 or $129.06 a month at three real utilities.
Those three figures are arithmetic from published rate schedules, not quotes from any utility. Each bill below shows its formula, so you can swap in your own gallons and your own rate. Our guide to what each sewer line item pays for covers the definitions; this page covers the math.
What does 6,000 gallons cost under three different sewer formulas?
A household using 6,000 gallons a month pays $29.04 for sewer in San Antonio, $71.60 in Eagle, Colorado, and $129.06 in Washington, DC, using a 5/8 inch meter or one single-family unit and each utility’s posted residential rate.
| Bill line | San Antonio Water System | DC Water | Town of Eagle, Colorado |
|---|---|---|---|
| Method | Winter average | All metered water | Flat fee |
| Rate date | 2026 column of the SAWS residential schedule, inside city limits | FY 2027 approved rates, effective October 2026 | 2026 rate, billed monthly |
| Fixed charge | $10.00 availability | $25.50 Clean Rivers charge at 1.0 ERU | $71.60 per unit |
| Volume rate per 1,000 gallons | $2.539 to 4,000, then $4.444 | $17.26 ($12.91 per CCF) | None |
| Gallons billed | 6,000 winter average, even if July use hits 15,000 | 6,000 metered this cycle | Not used |
| Arithmetic | $10.00 + (4 x $2.539) + (2 x $4.444) | $25.50 + (6 x $17.26) | $71.60 |
| Monthly sewer charge | $29.04 | $129.06 | $71.60 |
| What moves it | Water use in 3 billing periods between November 15 and March 15 | Every gallon, every cycle, plus paved area on the lot | Only a new town rate or unit count |
The $100.02 gap between the lowest and highest bar comes from formula and local capital cost, because the gallons are identical. For scale, the American Housing Survey put the median combined water and sewer cost at $57 a month in 2023, so DC’s 2026 sewer side alone runs 2.3 times that older combined figure. Small add-ons sit outside these totals: SAWS lists a $0.106 per 1,000 gallon Uplift Assistance fee, and DC Water bills a $0.62 PILOT fee and a $0.20 right-of-way fee per CCF.
How do you recompute your own sewer bill in 4 steps?
Recompute it by naming your formula, converting the billed volume to gallons, applying the rate blocks in order, then adding fixed charges. Two bills and your utility’s rate page are all it takes.
- Name the formula from a summer bill and a fall bill. Identical sewer volume on both means a winter average. Sewer volume that matches the water reading each cycle means all metered water. No sewer volume printed at all means a flat fee.
- Convert the units. One CCF or HCF is 748 gallons and one Mcf is 7,480 gallons, so DC’s $12.91 per CCF equals $17.26 per 1,000 gallons.
- Apply blocks in order. Only gallons above a threshold pay the higher rate. A 9,000 gallon SAWS average costs (4 x $2.539) + (5 x $4.444), or $32.38 before the $10.00 availability charge.
- Add fixed charges and compare with the printed total. A gap larger than the small per-gallon fees means a wrong rate class or a wrong volume.
If your math matches the print, the bill is correct and the only levers are volume and credits. If it does not, ask the billing office 3 things: which meter reads set your sewer volume, which rate class you are in, and the effective date of the rate used. DC Water requires bill disputes in writing with the reason stated, through its online form, by mail or by email.
Why is my sewer bill high when my water usage is normal?
A higher sewer bill on normal water use points to a rate change, a winter average set months ago, a default volume or a property-based charge, and none of those read this month’s meter.
- A rate rise. At a steady 6,000 gallons, DC’s sewer side was $124.67 in FY 2026, is $129.06 in FY 2027 and is approved at $134.62 for FY 2028. The Clean Rivers charge alone went from $21.23 per ERU in FY 2025 to $25.50 now, a 20 percent rise with no change in use.
- An old average. SAWS warns that an unrepaired leak can raise the winter average, and that average then sets monthly sewer charges for the year. A January leak shows up on the bill you open in July.
- A default volume. SAWS bills 5,985 gallons when no winter record exists, which is $28.98 against $17.62 for a household that really uses 3,000 gallons. Austin Water’s residential default is 5,000 gallons, and it also applies when under 100 gallons bills in 2 or more averaging months.
- A charge tied to the lot. DC’s tier for 2,100 to 3,099 square feet of hard surface is 2.4 ERU, or $61.20 a month at the FY 2027 rate, against $25.50 at 1.0 ERU. DC Water has paused new ERU measurements until at least FY 2029.
Why is my sewer bill higher than my water bill in DC, and not always in Philadelphia?
Your sewer line beats your water line when the sewer system’s own costs produce the higher per-gallon rate: DC charges $17.26 per 1,000 gallons for sewer against $8.68 to $11.23 for water, while Philadelphia reverses it at $7.63 against $10.50 and adds a separate stormwater charge. DC Water sets each rate through a cost of service study.
| 6,000 gallons, computed | DC Water, FY 2027 | Philadelphia Water, effective September 1, 2026 |
|---|---|---|
| Water, volume only | $59.74 | $63.00 |
| Sewer, volume only | $103.56 | $45.79 |
| Fixed rain-related charge | $25.50 Clean Rivers | $23.05 stormwater and billing |
| Sewer plus rain charge | $129.06 | $68.84 |
DC’s rain charge traces to a federal order. DC Water, the District and the United States entered a Consent Decree, entered by the federal court on March 23, 2005, to control combined sewer overflows, and DC Water says the Clean Rivers charge recovers the cost of the $3.27 billion federally mandated project. It bills that cost by paved area, so a low-use household with a large driveway still carries it.
EPA’s 2022 Clean Watersheds Needs Survey reports $630.1 billion in needs, including $151.1 billion for sewer conveyance and $36.5 billion for combined sewer overflow correction. The BLS water and sewerage index (CUUR0000SEHG01) read 767.041 in September 2026, up 4.7 percent in 12 months against 3.7 percent for all items, extending the 838 percent rise from 1980 to 2024. BLS combines water and sewer, so that series cannot separate the two. EPA’s December 2024 affordability report to Congress also notes that its Financial Capability Assessment measures a utility’s capacity to comply, not whether one household can afford the bill.
How much does a 200 gallon a day toilet leak add under each formula?
A running toilet at 200 gallons a day, the EPA estimate Denver Water reports, adds about 6,000 gallons a month, and the sewer cost swings from $0 to about $320 depending on formula and season.
| Three-month leak, base use 6,000 gallons | Starts in July | Runs through the winter window |
|---|---|---|
| San Antonio, winter average | $0 added to sewer | About $320, as $26.66 a month for the next year |
| DC Water, all metered | $310.68 across those 3 bills | $310.68 across those 3 bills |
| Eagle, Colorado, flat fee | $0 added to sewer | $0 added to sewer |
The water line still climbs in all 3 cities, so the leak costs money either way. Run the one-hour meter test in our high water bill checklist first. If the dial moves with every fixture off, ask a plumber for a toilet flapper and fill valve check plus service line leak detection, and keep the paid invoice, because Austin Water’s adjustment requires one. On a winter average, get that repair finished before November 15.
Which sewer credits lower the bill, and what are the actual terms?
Four levers exist, irrigation deduct meters, leak adjustments, winter timing and pool fill credits, but each is a local rule, so ask for it by name and check these 8 published rules before spending money.
| Lever | Rule source | Terms as published |
|---|---|---|
| Irrigation deduct meter | Village of Union Grove, Wisconsin, Sewer Credit Policy | Plumbing permit and passed inspection, no account balance, utility appointment to install, quarterly meter charge set by the Village Board |
| Automatic summer cap | Miami County, Ohio | June to October billing months, residential sewer stops at 5,000 gallons, no application, and no new residential deduct meters approved |
| Commercial-only credit | Philadelphia rates, Section 3.5 | Commercial and industrial users only, at least 5 percent of water not discharged or 225,000 cubic feet a year, so homeowners cannot use it |
| Leak adjustment | Austin Water, City Code 15-9-141 | Within 90 days of repair, send the receipt or paid invoice, account number, address, high-bill dates, and repair date and description |
| Non-leak high bill | Austin Water, City Code 15-9-142 | Single-family, 4 months of history, no adjustment in 2 years, billed at least 3 times expected volume, apply within 90 days |
| Leak credit with exclusions | City of Eagle Lake, Florida | Water service leaks only, 30 days to apply, based on a 6-month average, and leaking toilets and faucets are excluded because that water reaches the sewer |
| Winter timing | SAWS and Austin Water | SAWS averages 90 days over 3 billing periods from November 15 to March 15; Austin Water uses 3 consecutive fall and winter months set by bill cycle |
| Pool fill credit | Miami County; Palm Coast, Florida | Miami: 1 fill a year, $32.50 fee, 72 hours notice, inspection. Palm Coast: new pools or repairs only, 60 days, none within 24 months, sewer only |
The largest single move on a winter average costs nothing: dropping a SAWS average from 6,000 to 4,000 gallons saves $8.89 a month, or $106.66 over the year, at the 2026 rate. SAWS calls weekly winter irrigation an expensive mistake and suggests running it manually once a month if no rain falls. A deduct meter pays off mainly on all-metered billing, since a winter average already leaves summer irrigation out of the sewer volume.
More sewer bill questions, answered from utility rules
Is there a meter on the pipe that carries wastewater away from my house?
At SAWS and Austin Water, no. Both say no meter measures what leaves the home, which is why they average winter water readings. Your water meter, a winter average of it, or a flat fee stands in for the real flow, so 1,000 gallons on the lawn can bill as sewer in DC.
Do I still owe a sewer charge if the house sits empty?
Usually yes. The Town of Eagle charges its $71.60 whether or not the property is occupied. SAWS keeps its $10.00 availability charge on a 5/8 inch meter, and Austin Water assigns a 5,000 gallon default when under 100 gallons bills in 2 or more averaging months.
How much sewer charge does filling a pool add?
At DC Water’s $17.26 per 1,000 gallons, a 10,000 gallon fill adds $172.60 to sewer unless a credit applies. On a SAWS winter average, a July fill adds nothing to sewer, while a January fill raises the average that sets the next year of bills.
What does CCF, HCF or Mcf mean on a sewer bill?
CCF and HCF both mean 100 cubic feet, or 748 gallons. Mcf means 1,000 cubic feet, or 7,480 gallons. Divide your rate by 0.748 for CCF or by 7.48 for Mcf to get dollars per 1,000 gallons, which lets you compare any 2 utilities directly.
How long do I have to ask for a sewer bill adjustment?
It runs from 30 to 90 days at the utilities reviewed here. Austin Water allows 90 days from the leak repair, Palm Coast allows 60 days from the pool fill, and Eagle Lake, Florida allows 30 days. Palm Coast and Eagle Lake both expect the bill paid while the request is reviewed.
Can I lower a flat sewer fee by using less water?
No, because no gallons enter the formula. The Town of Eagle bills $71.60 per sewer unit whatever the meter reads, up from $69.51, a 3.0 percent rise. Saving water still trims the separate water charge, and the unit count on your account is the sewer detail worth checking.
How we sourced this
We read the rate schedules and credit rules linked above, DC Water’s amended Consent Decree, EPA’s CWNS page and 2024 affordability report, and the BLS CPI series. Every bill is our arithmetic, not a utility quote. DC Water’s own $107.86 average bill was reproduced from its rates as a check. SAWS heads its sewer table “effective January 1, 2025” above a column labeled 2026, and we used that column. The EPA leak figure is cited through Denver Water. Austin Water’s dollar rates could not be retrieved, so Austin appears for rules only, as summarized on its own pages rather than from the code text. Terms change, so confirm with your utility.
