CASE STUDY
Wisconsin Municipal Infrastructure
Real-World Performance: MarMac® PolySeal Couplers in Action
West Allis, WI
Spring 2024-26
80
HDPE
The MarMac® team visited the future City of West Allis Public Works facility in West Allis, Wisconsin — a western suburb of Milwaukee — where our 60″ PolySeal Couplers are being installed as part of a large-scale underground drainage system. Construction began in spring 2025 and is slated for completion in spring 2026.
Eighty (80) MarMac® PolySeal Pipe Couplers were installed across approximately 6,000 linear feet of 60″ diameter ADS N-12 HDPE pipe in one of the biggest single-site PolySeal deployments we’ve seen.
Project Overview
West Allis city officials broke ground on a $50 million public works facility at 1906 S. 53rd St. to replace the current building, which dates to 1941 and requires an estimated $5.8 million in maintenance work over the next decade. Planning for the replacement began as early as 2018 after a thorough evaluation of the aging structure.
The new facility spans more than 300,000 square feet across two stories and is designed with a 70-year lifespan. It will house public works staff, vehicle and equipment storage, and will also accommodate the city’s Engineering and Information Technology Departments. Notably, it will feature the first two-story parking garage at any public works facility in the state of Wisconsin. The building is designed to serve approximately 135 full-time and 25 seasonal employees.
The site itself has an interesting history — it was formerly the Wisconsin Motors campus, making it a brownfield redevelopment. The project is utilizing a soil remediation grant from the U.S. Environmental Protection Agency to address legacy contamination as part of the build.
General contractor VJS Construction Services of Pewaukee, Wisconsin is leading construction, with Kueny Architects (Pleasant Prairie) and engineering consultant firm Ramboll rounding out the project team. VJS is also providing precast work for the main and accessory buildings on site, and the scope includes demolition of an existing waste transfer building to make room for the new construction. The total project investment — including a separate earthworks contract and furniture and equipment — is estimated between $65 million and $80 million.
The new facility will take over all operational public works functions, while the original public works building at 6300 W. McGeoch Ave. will continue to serve as the city’s residential recycling and yard waste drop-off facility.
Supporting the underground infrastructure of this landmark project, MarMac® 60″ PolySeal Couplers were selected to seal every joint along approximately 6,000 linear feet of 60″ ADS N-12 dual-wall HDPE pipe manufactured by Advanced Drainage Systems, Inc. (ADS). A total of 80 couplers were specified and installed by Veit & Company, Inc., providing a consistent, infiltration-proof seal at each pipe joint across the entire run.
Advanced Drainage Systems, Inc.
6,000 Linear Feet
300,000 sq ft (2-story)
$65m-$80m est
70 years
Installation Overview
The contractor chose MarMac® PolySeal Couplers for the job due to their proven track record and long service life.
1 Reliability & Durability
2 Proven Performance
With 60-inch diameter pipe and 6,000 linear feet of installation, this project demanded a product that could deliver consistent performance at scale. The PolySeal Coupler met that requirement, enabling Veit & Company’s crews to work efficiently across the full length of the pipeline without sacrificing joint quality.
Why MarMac® PolySeal Couplers
The MarMac® PolySeal Coupler is purpose-built for HDPE and HDPP pipe systems, providing an external seal that accommodates the unique corrugated geometry of N-12 pipe. Key advantages on this project included:
Consistent sealing across large diameters. At 60 inches, joint integrity becomes increasingly important. The PolySeal Coupler provides a reliable, uniform seal regardless of pipe diameter, giving engineers and owners confidence in long-term system performance.
Efficient field installation. With 80 joints to seal across a large active construction site, ease of installation directly impacts project schedule. The PolySeal Coupler’s straightforward external application allowed the contractor to maintain productivity throughout the project.
Compatibility with the specified HDPE pipe. MarMac® PolySeal Couplers are designed and proven for use with ADS N-12 dual-wall corrugated HDPE pipe — the pipe system of choice on this project.
Project Results & Performance
Construction is ongoing through spring 2026. The scale of this installation — 80 couplers across nearly 6,000 linear feet of 60-inch HDPE — reflects the confidence that the project team placed in MarMac® products to deliver consistent, long-term performance beneath a high-profile, $65–80 million municipal facility designed to serve West Allis for the next 70 years.
That long-term durability expectation makes joint integrity all the more critical. A facility built to last seven decades demands underground infrastructure to match — and MarMac® PolySeal Couplers are engineered to do exactly that.
