South Mesquite Creek Regional WWTP Peak Flow and Expansion Phase 2.

The Training Building at 3500 Lawson Road in Mesquite is a completed new construction project. This 3,374 sq ft metal structure passed its final TDLR accessibility inspection in September 2026, confirming that the construction phase is complete. The building was built for the North Texas Municipal Water District as part of the South Mesquite Creek Regional WWTP Peak Flow and Expansion Phase 2.

The facility features a straightforward layout designed for utility and storage. It includes two storage rooms, with the primary space measuring 3,000 sq ft and a secondary room at 302 sq ft. A 72 sq ft restroom is also part of the interior. The building includes two overhangs, providing additional covered areas adjacent to the main structure.

Project Scope and Cost

The estimated cost for this project was $600,000. This figure places the project below the median estimated cost of $950,000 for new construction filings in Dallas County. The cost per square foot is $178, which is above the county median of $125 per square foot. The scheduled build window was 109 days, significantly shorter than the county median of 243 days for similar projects.

Carollo Engineers served as the design firm of record for the project. The registered accessibility specialist was Kimberly J Goss. The project was registered with TDLR in June 2025, with plan review completed in the same month. Construction began in July 2025, and the filing indicated a completion date of October 2025. The actual final inspection occurred in September 2026, marking the official end of the construction timeline.

The North Texas Municipal Water District has six other TDLR-registered projects, totaling over $62 million. These include facilities in Wylie, Leonard, Plano, and Richardson. The design firm, Carollo Engineers, has one other registered project in Baytown. This project is located in Dallas County, a region with a population of approximately 28,018 in the 75181 ZIP code area.