Plumber Naperville: The City Keeps Eight Wells It Does Not Drink From
Naperville buys its water. It comes out of Lake Michigan, is treated by the City of Chicago, is sold on by a regional commission, and enters the city through eight numbered connection structures. That much is ordinary for this part of Illinois. What is not ordinary is what the city kept when it made the switch.
The Illinois EPA still lists eight deep wells as active emergency sources for this system, each with its own treatment plant attached, alongside eighteen more wells recorded as abandoned or inactive. These are not relics nobody got round to deleting. In 2020 the City awarded two construction contracts worth more than three million dollars between them to rebuild two of those standby wells, and the work ran a year long.
Everything below comes from the state regulator and from the City Council record, both read in August 2026, with sources named at the foot and the figures we refused to state named beside them.
Where This Page Comes From, and Why That Is Unusual
Most of our city pages are built from the city’s own website. This one is not, and we would rather say so than let you assume otherwise. The City of Naperville web estate sits behind a bot protection layer that refuses automated readers outright, on every path we tried, including the annual water quality report itself. We do not attempt to defeat those systems. So we went to the sources that publish the same city from the outside.
The first is Drinking Water Watch, the Illinois EPA’s public database of every regulated water system in the state. Naperville is public water supply number IL0434670. The second is the City’s own legislative portal, which publishes every item that went to Council, with its file number, its date and the contractor and the dollar figure attached.
The practical effect is that this page is heavier on regulated facts and contract records than on rules and rates, because that is what those two sources actually publish. Where a figure is normally taken from a city water page, we have said plainly that we do not have it rather than borrowing it from a third party aggregator.
The thing nobody mentions
A Second Water System, Parked
Open the state’s record for this system and the Sources of Water table runs to twenty six wells. Eight of them carry status A for active, and every one of those eight is labelled EMERGENCY: wells 16, 19, 20, 21, 24, 26, 28 and 31. The remaining eighteen are marked abandoned or inactive.
The facilities table makes the commitment clearer still. Each of the eight standby wells has its own treatment plant listed against it, numbered TP 11, 14, 15, 16, 19, 21, 23 and 26. A well on its own is a hole with a pump in it. A well with a permitted treatment plant attached is a supply that has been kept ready.
Alongside them the same table lists the visible half of the system: seven elevated tanks, a run of ground storage sites, a standpipe, and treatment points named for the compass, South and Southeast and Southwest and West and Northwest and Northeast and West Southwest. That is a city that has grown outward in named directions and built water works to follow it.
Three Million Dollars on Water Nobody Is Drinking
It would be easy to read a list of emergency wells as an artefact, the kind of entry that stays in a database because deleting it is somebody’s job and nobody has done it. The Council record says otherwise, and it says it in dollars.
In May 2020 the Council rejected a bid for improvements to City Wells 28 and 31 together. The work was then split and re-tendered as two separate jobs. In July 2020 improvements to City Well 31 went to AMS Mechanical Systems at an amount not to exceed 1,323,200 dollars plus a three per cent contingency. In September 2020 improvements to City Well 28 went to Boller Construction at an amount not to exceed 1,739,800 dollars plus a three per cent contingency.
The design side has its own line. A change order to the engineering contract for improvements to City Wells 28 and 31, held by Strand Associates, brought that award to a total of 143,382 dollars. Then the Well 28 construction contract took three separate time extensions through 2021, of 76 days, 46 days and 90 days, which is 212 additional days on a single well.
Wells 28 and 31 are both on the state’s active emergency list today. So this is a city that ran a multi-year, multi-million dollar capital programme on two water sources that, on the record, supply nobody unless something goes badly wrong.
A way to read the whole system
Running, Resting, Retired
Almost every water system on this site divides naturally into who owns what, or into which district serves which street. Naperville divides better along a different axis: whether a thing is switched on, waiting, or finished. Once you sort the system that way, two facts that look strange separately start to make sense together.
The first is the money. Capital spending here is not concentrated on the parts of the system in daily use. It goes into reserve capacity and into pipe that is not yet failing.
The second is the compliance record, which is the subject of the next section, and which is almost entirely about the resting column rather than the running one. Neither of those makes sense if you assume a water utility spends where the water flows. Both make sense if you assume it spends where the risk is.
Nineteen Violations, and Not One of Them Is a Contamination Finding
The state’s violation list for this system holds nineteen individual entries and zero group entries. That is a number capable of frightening somebody who reads it cold, so here is what it actually contains.
Seventeen of the nineteen are dated 2026 and every one of them is attached to the same facility: Well 16, one of the eight standby wells. They are monitoring violations, sixteen of them typed by the state as MONITORING, ROUTINE MAJOR and one as MONITORING, STATE ONLY VIOLATION. The analytes are the pesticide and organics suite that a groundwater source has to be sampled for, names like atrazine, chlordane, dieldrin, toxaphene and benzo(a)pyrene.
The other two are old. One is a 2023 monitoring violation on the distribution system for total haloacetic acids, the disinfection by-product group. One is dated 1980 and concerns gross alpha.
What the regulator means by the word
This matters enough to use the state’s own definition rather than ours. Drinking Water Watch explains that violations are issued when a system fails to meet a drinking water regulation, and that this includes a failure to collect a sample, which it calls a monitoring violation, separately from delivery of water that exceeds a maximum contaminant level, which it calls a maximum contaminant level violation.
Every entry on Naperville’s list is in the first category. There is no maximum contaminant level violation on the record. There is no lead violation and no copper violation on the record. The seventeen open entries describe sampling that did not happen on schedule at a source that is not currently supplying anybody.
We are not going to pretend that is nothing, because a standby supply is only worth having if it can be switched on lawfully, and a sampling gap is exactly the kind of thing that delays a switch. But it is not what most people picture when they read the word violation, and the difference is worth carrying around.
Numbers you can actually use
Two Metals, Two Very Different Stories
The state publishes lead and copper as a 90th percentile for each monitoring period, and explains the term: rank every sample from lowest to highest and take the result that sits 90 per cent of the way up. It is the figure used to judge compliance, and it is a property of the round rather than of any one house.
Naperville samples heavily and twice a year. The first half of 2025 took 100 samples, the second half took 105 for lead and 104 for copper, and the 2026 period took 75.
Now compare the two metals. Lead sits at 0.0047, then 0.0071, then 0.006 milligrams per litre. Copper sits at 0.16, then 0.085, then 0.11. Lead is close to flat. Copper nearly halves and then climbs again, moving across a range of almost two to one between consecutive rounds of the same system.
Why a plumber cares about the copper number more than the lead one
Lead in a supply like this mostly comes from what is between the main and the tap, and it moves slowly, because service line materials do not change from one season to the next. A flat lead result across rounds is what a stable inventory of house connections looks like.
Copper is different. It comes off the inside of ordinary copper tube, and how much comes off depends on how corrosive the water is that day, how long it sat still in the pipe before the sample was drawn, and how hot it has been. A copper 90th percentile that swings between rounds is telling you about conditions inside household plumbing, not about the main in the street.
The practical version. If you have a copper reading concern in a Naperville house, the variable most within your control is stagnation. Water that has been standing in a pipe all night has had all night to pick something up. That is also why a first draw sample and a flushed sample from the same tap can disagree with each other and both be honest.
We would rather point you at that than print a scary number. The state record shows no lead or copper violation for this system on any period listed.
The other invisible spend
The City Has Been Lining Service Laterals for Years
A service lateral is the pipe from your building to the sewer main. On most of the cities we write about, it is the homeowner’s problem and the story ends there. In Naperville the Council has been awarding a contract called sanitary sewer service lateral lining and Vac-A-Tee installation, to the same contractor, in an unbroken run since at least 2016.
The amounts are not small. The current contract, 23-016, was awarded in 2023 at an amount not to exceed 1,949,995 dollars, then extended by option years at 1,691,277 dollars, 1,901,168 dollars and, in March 2026, 1,862,676 dollars. The contract before it, 20-032, ran at 1,249,980 and then 1,584,300 dollars.
Related work sits alongside it: sanitary sewer manhole rehabilitation awarded again in April 2026, and cured in place lining of small diameter sewer mains.
What we will not tell you about it, and the question to ask instead
Vac-A-Tee is a proprietary product name that appears in the contract title. We tried to read the manufacturer’s own description of it and the host would not resolve, so we are not going to explain what it is or what it does. Guessing at the mechanism of a named product from its name is how wrong information gets onto the internet.
What we can tell you is the useful part anyway. If your Naperville property is on the sanitary sewer and contractors have worked on your lateral at any point in the last decade, it is worth finding out from the City what was done and what, if anything, was installed. It changes the approach to a blockage.
- Whether your lateral has been lined at all, because a lined pipe is not cabled the same way as an unlined clay one.
- Whether there is an access point on the lateral outside the building, and where it is.
- Whether the blockage is on your side of the connection or beyond it, which decides who is responsible before anyone starts quoting.
- Whether the trouble is really the lateral, since a repeat backup at one fixture and a whole-house backup are different problems with different answers.
Said once, then linked
Where the Water in the Running Column Comes From
The state record names the seller plainly. Naperville’s water purchases are from the DuPage Water Commission treatment plant, delivered into the city through those eight connection structures, and Chicago appears on the facilities list as a purchase source. The primary source type for the whole system is recorded as surface water, purchased.
We are deliberately not building this page on that. Our Arlington Heights page already works through what it means to drink water your own village neither draws nor treats, including the part that matters most to plumbing, which is that the corrosion control chemistry protecting your pipes is dosed by somebody else. Our Chicago page covers the service line question at the treatment end.
The genuine contrast is with Rockford, which drinks the groundwater Naperville keeps parked. Same state, same aquifer country, opposite decision, and the household consequences run in opposite directions.
Three Wells the State Database Describes Two Ways
We print disagreements rather than tidying them away, and this system produces one inside a single database.
The Sources of Water table lists Well 5, Well 10 and Well 25 as abandoned. Turn to the Water System Facilities table of the same record and the treatment plants attached to those same wells are named TP 02 WELL 5 (INACTIVE), TP 06 WELL 10 (EMERGENCY) and TP 20 WELL 25 (EMERGENCY). All three of those facility entries carry an inactive status, so nothing here suggests a live source hiding in plain sight. But abandoned, inactive and emergency are three different words, and the same record uses two of them for the same asset.
The honest reading is that facility names are historic labels that were not renamed when the source status changed. We are not going to reconcile it for you, and we would not rely on either label alone to say what is in the ground at those sites.
What Naperville Is Digging Up This Year
One advantage of building a page from a Council record is that you get the current work programme by name rather than a generic list of neighbourhoods. These are the water main projects that went to Council in 2026, each named for the area it serves.
| 2026 project as named by the City | What went to Council |
|---|---|
| Kings Terrace water main improvements | Construction engineering services work order |
| Maplebrook Phase II water main improvements | Construction engineering services work order |
| Saybrook Phase III water main improvements | Construction engineering services work order |
| Ogden Avenue Phase II water main improvements | Construction engineering services work order |
| Fairway and Country Lakes water main improvements | Change orders to construction and to engineering |
| Odyssey West water main improvement | Construction bid, not to exceed 930,410 dollars |
| 2026 water main lining, city wide | Not to exceed 1,012,941 dollars, 16 month term |
| 2026 sanitary sewer manhole rehabilitation | Not to exceed 496,071.30 dollars, seven month term |
Two more running programmes are worth knowing about because they put a contractor on your property. The City runs a residential water meter replacement programme, awarded to a plumbing and heating company, and in July 2026 it bought a further tranche of meters under a single source procurement. It also contracts out the administration of its cross connection control testing records, which is to say the register of who has been tested and when is kept by an outside firm under contract, not in a filing cabinet at the city.
Five Minutes That Change What a Plumber Naperville Households Call Will Cost
- Decide whether it is water or waste. Water coming in and water going out are different systems with different owners and different emergency numbers. A pressure problem, a running meter and a wet ceiling belong to one. A backup, a smell and a gurgle belong to the other.
- Find the lowest drain opening in the building. If waste is going to present anywhere, it presents there first. In most Naperville housing stock that means a basement floor drain, a laundry standpipe or a basement shower. Knowing which one is yours saves a diagnostic visit.
- Ask the City what has been done to your lateral. Given the size and the continuity of the lining programme, this is a real question in this city rather than a long shot, and the answer changes the method.
- Check whether your street is on the current work list. If a main in your area is being lined or replaced this year, discoloured water and pressure changes have an obvious explanation and are not a fault in your house.
- Write down what changed and when. A fault that started the day after a meter was swapped, or the week the street was opened, is a different investigation from one that crept up over a year.
How the Local Picture Changes a Plumber Naperville Job
Three things on this page have direct consequences for the work itself, and they are the reason we wrote it this way round.
A lined lateral is not the same job as an unlined one. A copper result that swings with stagnation is a reason to test properly rather than to replace pipe on a hunch. And a city with an active capital programme in your street is a city where an unexplained change in your water very often has an explanation outside your walls.
Drains and blockages
Cabling, camera and jetting, chosen for what the pipe actually is rather than what is quickest.
Sewer and lateral work
Repair and replacement on the pipe between the building and the connection, including repeat backups that never quite get solved.
Finding leaks
Locating a loss before opening anything up, which matters more where water is metered and bought in.
Out of hours
Burst pipe, no water, or waste coming back into the building. We publish no response time for Naperville, because a number typed on a web page helps nobody standing in water.
Naperville Plumbing Questions, Answered From the Public Record
Eight standby wells, a violation list that is not what it looks like, and a lateral programme worth nearly two million dollars a year.
Nothing we read says they are in current use, and the state record classifies the system’s primary source as purchased surface water. What the record does show is that all eight are held at active status, each has a treatment plant listed against it, and two of them took more than three million dollars of construction work in 2020 and 2021. We are not going to state when or whether they have ever run, because no source we read says so.
Almost certainly in character, because groundwater and treated lake water are not the same product. We are not going to tell you how, because we did not read any analysis of those wells and we refuse to describe water we have no figures for. If you want to see what a genuinely groundwater-fed Illinois city deals with in fixtures and appliances, our Rockford page covers it from the other side.
Read what they are. Every one is a monitoring violation, which the state defines as a failure to collect a required sample, and seventeen of the nineteen are on a single standby well rather than on the water in the mains. There is no maximum contaminant level violation on the record, and no lead or copper violation. That is a different situation from a contamination finding and it should be read differently.
We do not know and we are not going to guess. The annual water quality report, which is where that figure normally lives, is published on a city web host that refuses automated readers, and the state database we used does not carry hardness. Several third party sites will offer you a number for this city. We do not use aggregators as sources and we would rather leave a gap than fill it with one.
We are not going to state an ownership boundary for Naperville, because we did not read the ordinance that sets it. What the Council record shows is that the City has run a continuous service lateral lining programme for years, which means the City is spending on laterals whatever the ownership line says. Ask the City directly where the line falls at your address before you accept anyone’s assumption about it.
We cannot tell you, and neither can anybody who has not looked it up for your specific address. The programme is large and long-running, which makes it a genuine possibility rather than a remote one, but it does not cover every street. The City holds the record. It is worth a phone call before you agree to any method of clearing a blockage.
Because we did not read a rate schedule or a fee schedule. The city host that publishes them would not open to us and we do not attempt to get around bot protection. Every figure on this page comes either from the Illinois EPA’s public water supply record or from an item that went to the City Council, both of which are linked below so you can check us.
Yes, Naperville in DuPage and Will Counties, west of Chicago, population recorded by the state as 156,406 served, with 45,580 residential service connections on the water system. There is one keyword row in our research data tagged to Indiana, which we treat as a tagging artifact rather than evidence of another notable Naperville.
Where Every Figure Came From, and What We Refused to State
The City of Naperville website was not used. It sits behind a bot protection layer that returned a refusal on every path we tried, including the annual water quality report. We do not attempt to defeat those systems, so we built the page from two other primary sources instead and have said so at the top rather than at the bottom.
The public water supply number IL0434670, the population served of 156,406 and the 45,580 residential service connections, the eight active emergency wells and their numbers, the eight treatment plants attached to them, the eighteen abandoned or inactive wells, the eight connection structures 15A to 15H, the DuPage Water Commission as seller and Chicago as a purchase source, the storage and water works inventory, the full violation list, the lead and copper 90th percentile summaries and sample counts, and the 22 September 2025 sanitary survey are all from the Illinois EPA Drinking Water Watch record for this system.
The definitions of a monitoring violation, of the 90th percentile and of a sanitary survey are quoted from the help pages of that same state system rather than written by us, because a regulator defining its own terms beats a plumber paraphrasing them.
The two well construction contracts and their amounts, the rejected joint bid and the split re-tender, the engineering award total, the three time extensions of 76, 46 and 90 days, the whole run of sanitary sewer service lateral lining and Vac-A-Tee installation contracts and their amounts, the 2026 water main projects by name, the water main lining and manhole rehabilitation awards, the residential water meter replacement programme and the cross connection control testing records administration contract are all items that went to the City Council and are published on the City legislative record. Both sources read in August 2026.
What we refused to state, and why. No water, sewer or electric rate, no connection charge and no permit fee, because no schedule was read. No hardness figure, no chlorine or fluoride figure, and no treated water chemistry of any kind, because the report that carries them is on the unreachable host and the state database does not publish them.
No claim about what the standby wells would deliver if they ran, because we read no analysis of them. No description of what a Vac-A-Tee is or does, because the manufacturer host would not resolve and guessing at a named product from its name is how bad information spreads. No claim that any particular address has had its lateral lined, and no ownership boundary for laterals, because we did not read the ordinance.
We also refused every third party aggregator. Several commercial sites publish confident water quality numbers for this city. None of them is a primary source and none of them appears anywhere above, which is why some ordinary questions on this page end in an honest gap instead of an answer.
No office, address, crew or response time of ours is stated for Naperville. Contract awards, programme scope, work schedules and regulatory status all change, and a violation open today may be resolved tomorrow. Confirm anything that matters with the City of Naperville or the Illinois EPA before relying on it.