Why Chicago plumbers still quote copper under the city's code

Chicago writes its own plumbing code, and it still steers most water piping to metal. The table of approved materials for water distribution lists brass, copper and galvanized steel, with no PEX. PVC drains are allowed only in residential space in buildings up to 60 feet tall. For a Chicago plumber, the code, the city license and the lead service line programs shape every quote, and they are what homeowners search before they call.

Reviewed on November 10, 2026. Read for this post: Title 14P and Chapter 18-29 of the Municipal Code of Chicago, the Department of Buildings’ license and Express Permit pages, the Illinois Department of Public Health’s plumbing page and the City’s Lead-Safe Chicago program pages. Suburban codes, and the rest of Illinois, were not checked. This is what the code says, not legal advice.

Where is the Chicago plumbing code book?

It is online and free, in the Municipal Code of Chicago on American Legal Publishing. Title 14P, the “Interim Plumbing Code”, is mostly a list: it incorporates Chapter 18-29, the technical rules first added in 2001, along with Chapter 4-332 (plumbers) and Chapter 4-336 (plumbing contractors). The ICC’s Building Safety Journal describes the code as “rooted in the International Plumbing Code (IPC) dating back to the IPC’s first edition.”

So “chicago plumbing code” is a search with its own answer, not a city version of a national one. It gets 320 US searches a month, and Google answers it with the code itself, the City’s pages and up.codes (LocalBiz analysis of DataForSEO data, November 2026). Those pages hold the text. None of them tells a homeowner what it means for the job in their basement. Your website can.

Amendments are dated under each section. The water distribution section carries an amendment from June 17, 2026, so quote the section number and the date you read it.

Is PEX allowed in Chicago? Not on the table

Not as a listed material. Table 18-29-605.5, water distribution pipe, names:

The water service, the line from the street to the building, is narrower still. Table 18-29-605.4 lists two materials: Type K copper tubing and ductile iron water pipe, rated for at least 160 psi underground.

For a quote, that settles the material line. A homeowner who has read about PEX in a national article will ask why your number is higher. A repiping page that says “Chicago’s code lists copper for water lines; here is the table” answers the question before the visit, with a section number they can check.

Is PVC allowed? For drains, up to 60 feet

Yes, for drain, waste and vent pipe, within a height limit. Table 18-29-702.1 lists solid-wall PVC with note a: “Limited to areas of residential occupancy in buildings with a building height not exceeding 60 feet.”

That note dates from the 2021 interim amendments (Council Journal, October 14, 2021). The City’s release, as PHCP Pros reported it, said the change would “allow the use of PVC drainpipes for low- and mid-rise residential buildings” and the residential part of mixed-use buildings, citing savings of “5 to 75 percent of plumbing costs (average 44 percent)” from a four-year study.

The pages this calls for:

• Drain and stack replacement in two-flats and three-flats, saying which pipe you would use and why.
• Mixed-use buildings with apartments over a storefront: the residential part may take PVC, the commercial part may not.
• Taller buildings and commercial space, where the note rules PVC out, and your page says what you use instead.

Who may do the work: the city license

A Chicago plumbing contractor license. The Department of Buildings says one is required to “install, alter, repair, or maintain any plumbing piping, system, or appliance within the City of Chicago.” A contractor licensed by the State of Illinois “must also obtain a City of Chicago plumbing contractor license” to work in the city.

What the City asks for:

1. A proprietor, partner or corporate officer who holds a City of Chicago plumber license, who files the application.
2. A $20,000 performance bond, payable to the City and filed with the City Clerk.
3. $150 a year in 2026. The license lapses if the bond lapses or the plumber’s license does.

Individual plumbers may hold a city license or one from the Illinois Department of Public Health, which licenses about 8,900 plumbers and 2,000 apprentices. An IDPH license is recognized in Chicago “so long as the plumber’s employer has a City of Chicago plumbing contractor license.”

There is one do-it-yourself exception: the owner, occupant or lessee of a detached single-family house. That matters in this city. The Census Bureau’s 2019–2023 survey counts 356,309 Chicago housing units in buildings of two to four units, against 324,810 detached single-family homes. The owner of a two-flat, a three-flat or a four-flat can’t do it themselves: plumbing there needs a licensed contractor.

Put both numbers on your site: the city contractor license and each plumber’s license. A homeowner can ask what you hold, so show it before they ask.

The permit your quote should name

Most repair and replacement work goes through the City’s Express Permit Program. For plumbing, it covers repairing or replacing existing fixtures, existing supply or drain-waste-vent piping and risers inside a building, and an existing water heater. It does not cover altering, reconfiguring or extending a system, work more than 5 feet outside the foundation, or work in hospitals and other institutional buildings. Work “must be performed by the Chicago-licensed plumbing contractor or homeowner listed on the permit application.”

The water heater terms give you a checklist the homeowner can read on your page:

• A full-port 3/4-inch shutoff on the cold water branch; no valves on the hot side.
• Unions on the heater, dielectric where metals differ.
• The manufacturer’s installation instructions on site at inspection.
• The relief valve outlet not connected directly to the drain system.

A water heater page that names the permit and what the inspector checks reads like someone who has passed that inspection.

Lead service lines: the city’s programs come first

The City runs the big lead line work, and your page should say so. Lead-Safe Chicago, the City’s program site, says a house or two-flat built before 1986 has “a high likelihood” of a lead service line. Chicago’s housing is old: the Census Bureau’s median year built for the city is 1952, and 76% of its housing units were built before 1980.

Lead-Safe Chicago says that since January 2023 “a new state law bans partially replacing lead service lines,” so private and public sides are replaced together.

What a Chicago plumbing click costs, and who is on the map

From inside Chicago, monthly searches and advertisers’ cost per click (LocalBiz analysis of DataForSEO data, November 2026):

An advertiser pays $58.68 for one “emergency plumber” click from inside the city. A page that ranks pays nothing per visit. That comparison is the case for the pages in this post; the wider version is in paying for the call vs. ranking for it.

On Google Maps, the top 20 results for “plumber” seen from Chicago: 17 link a website, and 9 show no street address, the way a service-area business is set up. The median review count was 486 for the top three and 78 across all 20. One search, one day, one point on the map. Our read: a website is expected here, so what is on it has to do the work.

Pages to write before the next permit

In order:

1. A license line on every page: your City of Chicago plumbing contractor license and the license each plumber holds.
2. Repiping and water service: copper and the two water service materials, with section numbers and the date you checked.
3. Drain and stack replacement: PVC up to 60 feet in residential space, and what you use where the note rules it out.
4. Water heater replacement: the Express Permit and the inspector’s checklist above.
5. Lead service line replacement: the three City programs, which one fits whom, and your part in the homeowner-initiated one.
6. Two-flat and small-building work: why the owner needs a licensed contractor.

New York’s code puts different items on a plumber’s page; compare service pages for NYC plumbers. The trade’s searches and page ideas are on our plumbers page.

Then count quote requests by page each month. If the lead line page brings requests and the repiping page doesn’t, the repiping page needs more Chicago in it. LocalBiz also tracks where your website ranks in the regular results in each town you serve; pricing shows what it costs.