Not recommended for homeowners. This project involves significant excavation, specialized plumbing skills, compliance with complex building and plumbing codes, and coordination with local utilities. Professional installation by licensed contractors ensures safety, code adherence, and warranty coverage.
For typical residential water service line upgrades involving direct replacement, the project can be managed with proper planning and adherence to established codes. While requiring specialized skills for excavation, plumbing, and code compliance, the scope is generally well-defined, making it a routine construction activity when executed by qualified professionals.
Project Guidelines & Rules
I. Permitting & Planning
4 Rules
Obtain necessary permits from your local building department prior to commencement of work.
Illinois Plumbing Code (77 Ill. Adm. Code 890.1010), 2024 IRC R105.1
Contact JULIE (Joint Utility Locating Information for Excavators) at 811 a minimum of 48 hours prior to any excavation.
Illinois Underground Utility Facilities Damage Prevention Act (220 ILCS 50/1 et seq.)
Submit a detailed site plan indicating the existing and proposed service line path, connection points, and adjacent utilities.
2024 IRC R106.1, Local Building Department Requirements
Coordinate disconnection and reconnection with the local water purveyor.
Local Water Purveyor Ordinances & Procedures
II. Excavation & Backfill
4 Rules
Minimum trench depth for water service lines shall be 42 inches to protect against frost penetration within DuPage County.
Illinois Plumbing Code (77 Ill. Adm. Code 890.1130), DuPage County Regional Standard
Maintain appropriate separation distances from other utility lines (sewer, gas, electric).
Illinois Plumbing Code (77 Ill. Adm. Code 890.1200), 2024 IRC P2603.5, 2023 NEC 300.5
Ensure safe trenching practices, including proper shoring or sloping, as required by OSHA standards and local safety regulations.
29 CFR 1926 Subpart P, 2024 IRC R104.2
Backfill material shall be free of debris and sharp objects, placed in compacted lifts to prevent settlement, especially around the pipe.
2024 IRC P2603.6, Local Engineering Standards
III. Plumbing - Service Line Materials & Sizing
3 Rules
Approved materials for water service lines include copper (Type K or L), PEX (cross-linked polyethylene), or HDPE (high-density polyethylene).
Illinois Plumbing Code (77 Ill. Adm. Code 890.410), 2024 IRC P2906.5
Prohibited materials for new service lines include lead, galvanized steel, or other materials not listed in approved codes.
Illinois Plumbing Code (77 Ill. Adm. Code 890.410)
Pipe sizing shall be determined based on fixture unit demand, building supply pressure, and length of run to ensure adequate flow and pressure.
Illinois Plumbing Code (77 Ill. Adm. Code 890.1510), 2024 IRC P2903.1
IV. Plumbing - Installation & Connections
6 Rules
All underground water service piping shall be installed at a minimum depth of 42 inches below finished grade.
Illinois Plumbing Code (77 Ill. Adm. Code 890.1130), DuPage County Regional Standard
Connections to the public water main shall conform to the standards of the local water purveyor and be performed by authorized personnel.
Illinois Plumbing Code (77 Ill. Adm. Code 890.110), Local Water Purveyor Requirements
A main shut-off valve (curb stop) shall be installed on the building side of the property line, accessible for maintenance.
Illinois Plumbing Code (77 Ill. Adm. Code 890.420), 2024 IRC P2903.9
A readily accessible main shut-off valve shall be installed immediately inside the building where the water service pipe enters.
Illinois Plumbing Code (77 Ill. Adm. Code 890.420), 2024 IRC P2903.9
Backflow prevention devices shall be installed as required by the local water purveyor and plumbing code.
Illinois Plumbing Code (77 Ill. Adm. Code 890.1140), 2024 IRC P2902.1
Protect piping from physical damage where it penetrates foundations or other structures.
2024 IRC P2603.4
V. Electrical Considerations
2 Rules
If a metallic water service pipe, previously part of the grounding electrode system, is replaced with non-metallic piping, an alternative or supplemental grounding electrode system must be installed or verified.
2023 NEC 250.50, 250.52(A)(1), 250.68(C)
Maintain required clearances from electrical wiring and equipment during excavation and installation.
2023 NEC 300.5
VI. Inspection & Testing
3 Rules
The water service line shall be tested for leaks under hydrostatic pressure prior to backfill. The test pressure shall be a minimum of 50 psi, maintained for at least 15 minutes without visible leaks.
Illinois Plumbing Code (77 Ill. Adm. Code 890.1700), 2024 IRC P2503.5.1
Schedule a rough-in plumbing inspection with your local building department before covering any new piping.
Illinois Plumbing Code (77 Ill. Adm. Code 890.1010), 2024 IRC R109.1.3
A final plumbing inspection is required upon completion of all work and before the system is placed into permanent service.
Illinois Plumbing Code (77 Ill. Adm. Code 890.1010), 2024 IRC R109.1.4
