Plumbing St Louis: Your Fixtures Are Your Bill
Almost every city page we write says the same thing in the end. Find the leak quickly, because the meter is running. St Louis is the one city where that sentence is wrong for most households, and it is wrong in an interesting way.
Most residential properties inside the city are not metered. They are billed at a flat rate calculated from the physical characteristics of the property, which in practice means counting rooms, water closets, baths and showers, and measuring the width of the lot. The sewer district does the same thing when there is no meter. So for a large share of St Louis homes, neither utility bill looks at a single gallon.
That changes what costs money and what does not. This page sets out the flat rate schedule, the metered alternative and what it takes to get onto it, the combined sewer that makes storms a plumbing problem here, and the boundary the sewer district draws around your lateral.
What the flat rate actually charges you for
The Water Division publishes the schedule as quarterly charges. On the 2026 rates, effective 1 July 2026, a room is $6.57 each, a water closet is $25.76 each, a bath is $21.61 each and a shower separate from a bath is another $21.61. On top of that sits a sprinkling charge of 44 cents per linear foot, assessed each quarter for lawn sprinkling and other outside use.
An unmetered swimming pool, pond or other pool with a capacity between 100 and 2,000 cubic feet carries its own banded charge: $35.47 for the smallest band, then $49.65, then $63.86, then $78.03 for the largest. Above 2,000 cubic feet the arrangement changes and the code section governing metering applies instead.
Read the list again and notice what is missing. There is no volume anywhere in it. The bill is a function of what plumbing you own and how wide your frontage is. A household that showers twice a day and a household that showers twice a week pay exactly the same, provided they own the same fixtures.
Here is the consequence in money, and this arithmetic is ours rather than the Water Division. Adding a bathroom with one water closet and one bath adds $47.37 to every quarterly bill, which is $189.48 a year, permanently, whether the room gets used daily or never. Decommissioning a disused fixture works the other way.
On a flat rate, a leak costs nothing until it costs everything
If your home is unmetered, a running toilet does not appear on your water bill, because your water bill was calculated before the toilet started running and will be the same after it stops. The sewer district works the same way for unmetered properties, computing its volume charge from the number of rooms, baths, water closets and showers in the building rather than from consumption.
We are not going to pretend that makes a leak harmless, and it would be dishonest to imply it. What it does is remove the early warning. In a metered city a leak announces itself on the next bill, which is often how people find out. In unmetered St Louis nothing announces it. The first notification is usually damage.
So the diagnostic habits that matter here are physical rather than financial. Sound, at night, with everything closed. Damp or warm patches on floors. Unexplained movement at the meter if one exists on the property. A stain that returns after being painted over. Those are the signals that replace the bill spike other cities rely on.
The exception is the sprinkling charge, which is worth understanding precisely because it is so easy to misread. It is levied per linear foot of frontage, so a broken irrigation line does not increase it and a summer of careful watering does not reduce it. Corner lots and wide lots pay more than narrow ones regardless of behaviour.
Getting a meter, and why that is a plumbing job by ordinance
The flat rate is not compulsory forever. The code gives the user the option to pay at metered rates instead, exercised in writing on forms supplied by the Water Commissioner. But it also sets the condition, and the condition is the reason this page exists.
The user, it says, shall provide for the meter by having a meter box and set up installed on the service in accordance with the current connection regulations, furnished and installed at the user own expense by a licensed plumber. The route off a fixture-count bill runs through a licensed plumber, at the homeowner cost, as a matter of ordinance rather than preference.
Whether it is worth doing is arithmetic, and it depends entirely on how many fixtures you own against how much water you actually use. A large old house with many rooms, several water closets and a wide frontage carries a heavy flat charge and may use very little water. A small house with few fixtures and a big family may be better off exactly where it is.
The Water Division publishes an estimated bill calculator covering both flat and metered accounts with projections out to 2032, which is the sensible place to run your own numbers before paying anyone to dig. Metered accounts are described as primarily commercial properties and residential dwellings of seven or more units, with single family homeowners able to opt in.
The metered side runs backwards compared with everywhere else
If you do go metered, the quantity charge is a declining block. The first 250 hundred cubic feet cost $3.09 each per quarter. The next 19,750 cost $2.42. Everything over 20,000 costs $1.55. The more you use, the cheaper each unit becomes.
That is worth pausing on, because it is the opposite of every other city we have documented. Camarillo, Fulton County and Round Rock all use inclining blocks specifically designed to make heavy use expensive. St Louis prices the first block highest and the last block at almost exactly half of it.
On top of the quantity charge sits a readiness to serve charge set by meter size, again quarterly: $41.72 on a five eighths inch meter, $48.63 on three quarter inch, $61.63 on one inch, $89.14 on one and a half, $129.54 on two inch, and rising through $251.16, $445.51, $850.57 and $1,296.06 to $1,782.12 on a ten inch meter.
Reduced rates exist and are published. An affordability rate for qualified customers runs at roughly half the standard figures on both the flat and readiness schedules. Schools, qualified charitable institutions, hospitals, zoological parks and museums pay $1.63 per unit across all blocks, and the Water Division states that the hospitals, zoological parks and museums classification is eliminated effective 1 January 2027.
The combined sewer, and why storms are a plumbing problem here
The Metropolitan St Louis Sewer District states the distinction directly: the City of St Louis is served by a combined sewer system, where wastewater and stormwater share the same pipe, while most of St Louis County is served by a separate sewer system with two sets of pipes. Different solutions are needed in each.
That one sentence explains a great deal of city plumbing behaviour. When the same pipe carries both, heavy rainfall competes directly with the drains inside your building for capacity. A basement that has been dry for years can back up during a storm without anything in the house having changed, because what changed was outside.
MSD says that where removing stormwater connections is cost effective, in areas served by separate systems, it will cover all costs and schedule the work on your property as part of an ongoing capital improvement programme. Note the qualifier carefully, because the City itself is on the combined side of that sentence rather than the separate side.
On response, MSD says urgent situations, which it defines as raw sewage found inside or outside the house, missing manhole covers and flooded streets, usually draw a maintenance crew within a few hours. It also warns that during especially heavy rainfall it may receive hundreds of calls and that a response may take from a few hours to a few days. Non-urgent cave-ins and settlements are typically followed up within a few weeks.
- The lateral line connects your home or building to the public sewer system
- The lateral line, including connection, is private property
- It is the property owners responsibility to maintain and repair the lateral line
- On a reported cave-in, a crew secures the area and then conducts a dye test to determine whether the cause is a defect in the public sewer
- MSD has a limited programme to assist customers who experience building backups in certain cases, reached on 314-768-6260
- An MSD representative inspects the building to see whether the situation qualifies
- MSD bills approximately 430,000 commercial and residential accounts monthly
- The wastewater rate changes on 1 July each year and appears on the bill you receive in August
What the dye test decides, and why it matters to you
The dye test is the most practically important item on that list, because it is the mechanism that decides whose bill a collapse is. Dye is introduced and the crew observes where it goes. If the cave-in traces to a defect in the public sewer, that is MSD work. If it traces to the private lateral, it is yours, and the district has already told you in advance that the lateral including its connection is private property.
That is a cleaner boundary than several cities we have written up, which simply decline to say. It also means the useful thing to do before assuming responsibility for a sinking patch of garden is to report it and let the test happen, rather than excavating first and finding out afterwards.
For commercial and industrial customers the sewer bill is structured differently again. The base charge is $34.85 a month with metered volume at $7.15 per hundred cubic feet. A compliance charge is tiered by inspections and sample points, running $8.00 a month with no inspection and no sample point, $119.78 with one inspection, $255.52 with one inspection and one sample point, $399.24 with two sample points and $534.97 with more than two.
Excess strength sewage carries surcharges on top: $780.50 a ton for suspended solids over 300 milligrams per litre, $1,205.38 a ton for biodegradable oxygen demand over the same threshold, and $602.70 a ton for chemical oxygen demand over 600 milligrams per litre. For a kitchen, grease control is therefore a billing question as well as a blockage one.
The inventory the city is asking residents to help build
In October 2024 the US Environmental Protection Agency issued a final rule strengthening protections for lead and copper in drinking water and setting out requirements for replacing lead service lines. To comply, the City of St Louis is updating its inventory of water service line materials, and it is asking residents to verify the material on private property.
The process the Water Division publishes is short. Check your address on the water service line map and note what material it records. Read the Service Line Identification Procedure and follow it to determine the actual material. Take one to three photographs. Report the finding through the City online form. Missouri Department of Natural Resources also publishes a video guide to identifying service line material.
This is worth doing properly rather than guessing, and it is a reasonable thing to ask a plumber to confirm while they are already under your sink. Service line material affects far more than the inventory: it affects what can be connected to what, how a repair is made and whether a replacement is warranted.
We are not publishing a count of lead service lines in St Louis, or a percentage, or a replacement timeline. The pages we read describe the process and not the totals, and a number of that sensitivity should come from the City inventory itself rather than from us.
Find out if you are metered
It changes everything else on this page. Most city homes are not, and are billed on fixtures instead.
Hunt leaks by sound, not by bill
On a flat rate no bill will ever warn you. Listen at night, watch for returning stains and damp.
Count fixtures before you add one
A new water closet and bath adds $47.37 a quarter permanently. Worth knowing before the plans are drawn.
Do the meter sum first
Switching means paying a licensed plumber for a box and set up. Run the City calculator before you commit.
Treat storms as a drainage risk
The city is on a combined sewer, so heavy rain and your drains share one pipe. Backwater protection is worth discussing.
Report cave-ins before digging
MSD dye tests to establish whether the public sewer is at fault. Excavating first forfeits that answer.
Four cities, four completely different definitions of a water bill
Reading these pages side by side makes the point better than any single one of them can. In Camarillo the sewer charge is flat and the water charge is tiered, so a leak lands entirely on the water side. In Alpharetta the sewer volume charge is nearly double the first water tier, so a leak lands mostly on the sewer side.
In St Louis, for an unmetered home, it lands on neither, because neither bill is measuring. And when a St Louis property does go metered, the price per unit falls as consumption rises rather than climbing, which reverses the incentive that every other city on this site is built around.
None of that makes one city right and another wrong. It makes the local answer genuinely local, which is the whole reason we write these one at a time rather than templating them. The state overview sits on our Missouri plumbing page.
One last St Louis specific caution. The City of St Louis is an independent city and is not part of St Louis County, and MSD serves both with different sewer arrangements in each. An address a few minutes away can sit under a separate sewer system, a different set of rules and a different answer to the same question.
Plumbing St Louis: the questions a fixture-count bill creates
Answers built only from what the City of St Louis Water Division and the Metropolitan St Louis Sewer District publish. Where we have done arithmetic, the sentence says so.
For most residential properties inside the city, no. The Water Division states that most residential properties within the city are billed at a flat rate calculated quarterly based on the physical characteristics of the property, which means the number of rooms, water closets, baths and showers plus a sprinkling charge assessed per linear foot. Metered accounts exist and are primarily commercial properties and residential dwellings with seven or more units, though single family homeowners can opt in.
On the 2026 schedule, effective 1 July 2026, the quarterly charges are $6.57 for each room, $25.76 for each water closet, $21.61 for each bath, $21.61 for each shower separate from a bath, and 44 cents per linear foot for sprinkling. Unmetered pools between 100 and 2,000 cubic feet are banded at $35.47, $49.65, $63.86 and $78.03 by capacity.
If your property is unmetered, it will not show up on either bill, because the water bill is calculated from fixtures rather than volume and the sewer district computes its charge the same way where no meter is in use. That is not a reason to leave it. It means you lose the early warning a bill spike gives you elsewhere, so damage tends to be the first thing you notice.
The option is exercised in writing on forms supplied by the Water Commissioner. The code then requires the user to provide for the meter by having a meter box and set up installed on the service in accordance with current connection regulations, furnished and installed at the user own expense by a licensed plumber. The Water Division publishes an estimated bill calculator covering both flat and metered accounts, with projections to 2032, which is the place to check whether the switch would save you anything.
On a metered account, yes. The quantity charge is a declining block: $3.09 per hundred cubic feet for the first 250, $2.42 for the next 19,750 and $1.55 for anything over 20,000, all quarterly. That is the opposite of the inclining conservation tiers used by most cities we have documented. A readiness to serve charge by meter size applies on top, starting at $41.72 a quarter on a five eighths inch meter.
You are. MSD states that the lateral line, including the connection, is private property and that it is the property owners responsibility to maintain and repair it. The lateral is the pipe carrying wastewater from your sinks, showers, toilets, dishwashers and washing machines to the public sewer.
The City of St Louis is served by a combined sewer system, which MSD describes as one where wastewater and stormwater share the same pipe. Most of St Louis County, by contrast, has a separate sewer system with two sets of pipes. In a combined system heavy rainfall competes with your building drains for the same capacity, which is why a basement can back up during a storm with nothing having changed indoors.
It has a limited programme. MSD states that it can assist customers who experience building backups in certain cases, that you should call 314-768-6260, and that a representative will inspect your building to see whether your situation qualifies. It does not describe it as automatic and neither will we.
MSD sends a crew to secure the area for public safety, then conducts a dye test to determine whether the cave-in is caused by a defect in the public sewer system. That test is what decides responsibility, so reporting it and letting the test happen is worth doing before any private excavation. MSD says non-urgent cave-ins and settlements are typically followed up within a few weeks.
The City is currently updating its inventory of water service line materials to comply with the US EPA final rule issued in October 2024, and it asks residents to help by verifying the material on private property, checking the service line map, following the Service Line Identification Procedure, photographing the line and reporting through an online form. We are not publishing a count or a percentage, because the pages we read describe the process rather than the totals.
They move on different clocks, which is worth knowing. Water rates are set by the Board of Aldermen and change by ordinance; the current schedule is effective 1 July 2026. MSD changes its wastewater rate on 1 July each year, and states that the new rate appears on the bill you receive in August.
No, and it matters here. The City of St Louis is an independent city and is not part of St Louis County. MSD serves both, but the City is on a combined sewer system while most of the County is on a separate one, so the same problem can have a different cause and a different remedy a short distance away.
Sources, arithmetic and what this page does not claim
Related work on this site: leak detection, drain cleaning, sewer line repair and emergency plumbing.
Every water rate above comes from the City of St Louis Water Division 2026 water rates page, rates effective 1 July 2026: the flat rate charges per room, water closet, bath and shower, the sprinkling charge per linear foot, the unmetered pool capacity bands, the readiness to serve charges by meter size, the declining block quantity charges, the affordability rate, the school and charitable institution rate, and the statement that the hospitals, zoological parks and museums classification is eliminated effective 1 January 2027.
The same page is the source for the statement that most residential properties within the city are billed at a flat rate based on the physical characteristics of the property, that metered accounts are primarily commercial properties and residential dwellings of seven or more units with single family homeowners able to opt in, that the Board of Aldermen sets the rates, and for the estimated bill calculator with projections to 2032.
The metering option and its condition are quoted from the same page, which reproduces the code requirement that after paying the flat rates the user may opt to pay at metered rates instead, exercised in writing on forms supplied by the Water Commissioner, and that the user shall provide for the meter by having a meter box and set up installed in accordance with current connection regulations, furnished and installed at the user own expense by a licensed plumber.
The lead service line inventory process, the October 2024 US EPA final rule, the service line map, the identification procedure, the photograph requirement and the Missouri Department of Natural Resources video guide come from the City of St Louis Identify and Report a Lead Service Line page.
The sewer material comes from the Metropolitan St Louis Sewer District Sewer Backups page and its Rate Information page: the statement that the lateral line including connection is private property and the owner responsibility to maintain and repair it, the combined sewer system in the City against the separate system in most of St Louis County, the stormwater disconnection programme and its cost coverage, the urgent response definition and timescales.
The same two MSD pages supply the cave-in dye test, the limited building backup assistance programme and its telephone number, the approximately 430,000 accounts, the 1 July annual rate change appearing on the August bill, the statement that the wastewater user charge is based on water used or, where no meter is in use, on the number of rooms, baths, water closets and showers, and the commercial and industrial base charge, metered volume rate, compliance charge tiers and excess strength surcharges.
The arithmetic in this page is ours and is labelled as ours in the copy as well as here. That adding a bathroom with one water closet and one bath adds $47.37 a quarter and $189.48 a year is our addition and multiplication of two published flat rate figures. That the top metered block is close to half the first block is our comparison of $1.55 against $3.09. The observation that the flat rate removes the early warning a metered bill provides is ours, and so is the observation that the sprinkling charge cannot respond to behaviour because it is levied on frontage rather than on water.
Refused and left blank rather than estimated: the MSD residential wastewater rates themselves, both metered and unmetered, because only the commercial and industrial table was among the pages read; every plumbing permit and inspection fee; water hardness and every drinking water constituent value; the number or proportion of lead service lines in the City inventory and any replacement timeline.
Also refused: any count of sanitary sewer overflows or building backups; the terms of the water line insurance item that appears on City water bills, because only its existence was observed and not its conditions; and the number or share of St Louis households actually on flat rather than metered accounts, which the Water Division characterises as most without publishing a figure on the pages read.
No office, address, crew, response time, guarantee or coverage claim of ours is stated for St Louis, and no testimonial or performance statistic appears anywhere above. The response timescales quoted are MSD own published expectations, not ours. Rates, ordinances and programmes change, and both utilities revise on published annual cycles, so confirm current requirements with the City of St Louis Water Division or MSD Project Clear before relying on anything here.