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DuPage County, IL Building Safety: Plumbing Permits (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Code adopted
Illinois Plumbing Code, IDPH
Sewer connections
Overhead sewer system required
Above-ground water pipe
Type M or L copper
Underground water pipe
Type K copper
New fixtures
WaterSense label when available

Summary

DuPage County adopts the Illinois Plumbing Code by reference for unincorporated areas, with local amendments on pipe materials, sewer connections, and WaterSense fixtures.

City-specific rules exist: Naperville has its own plumbing permits rules that differ from DuPage County's county-level regulations. If you live in Naperville, check the city-specific page instead.

There is hereby adopted by reference, as if fully set out herein, that certain code known as The Illinois Plumbing Code as sponsored and published by the Illinois Department of Public Health, together with the following additions, insertions, deletions and amendments hereinafter set forth.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 14 Update 1).

Full Breakdown

Under Sec. 8-400, unincorporated DuPage County enforces the Illinois Plumbing Code (Illinois Department of Public Health) rather than a homegrown plumbing chapter. The Building Official's amendments require Type M or L copper for above-ground domestic water piping, Type K copper underground, and an overhead sewer system inside the building for every sanitary sewer or septic connection except slab-on-grade construction. New fixtures and irrigation controllers must carry the WaterSense label when available. Plumbing work itself falls under the general Sec. 8-112.1 building permit requirement, and a licensed plumbing contractor schedules the rough and final plumbing inspections before walls are closed up.

Violations & Fines

Working without the required Building Official permit or installing non-compliant piping/sewer connections triggers a stop-work order and a violation notice; the Building Official can also void the permit.

Frequently Asked Questions

Does DuPage County have its own plumbing code?
No. Unincorporated DuPage County adopts the Illinois Plumbing Code by reference under Sec. 8-400, with a handful of local amendments on pipe materials and sewer connections.
Do I need a permit for plumbing work at my house?
Yes. Sec. 8-112.1 requires a Building Official permit before installing equipment like water heaters or water softeners, and a licensed plumber must schedule rough and final plumbing inspections.

Sources & Official References

Other rules in DuPage County

Parking Rules: Street Parking LimitsSignificant RestrictionsBuilding PermitsSome RestrictionsFire Sprinkler RequirementsSome RestrictionsBuilding InspectionsSome RestrictionsCarbon Monoxide DetectorsSome RestrictionsChildcare Center RulesSome RestrictionsElectrical PermitsSome RestrictionsNoise Ordinances: Barking DogsSome RestrictionsParking Rules: Commercial & Oversized VehiclesHeavy RestrictionsParking Rules: Driveway RulesSome RestrictionsFence Regulations: Fence Permit RequirementsSome RestrictionsFence Regulations: Material RestrictionsSignificant Restrictions

All DuPage County rules

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Plumbing Permits in Cities Across DuPage County

Naperville, IL