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Mehall Contracting

From dirt to discharge.

Industrial wastewater systems, built from the ground up. Excavation through startup on one contract.

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What do we build?

[ Our specialty ]

Pre-treatment is our niche.

The systems that treat industrial wastewater before it reaches the sewer. Designing and installing them is what we are known for.

01 / 04

We dig it.

Deep shored excavation at an industrial site in golden hour light

Excavation, shoring, and earthwork. The hole is half the job, and it is the half most installers cannot self-perform.

02 / 04

We set it.

Crane lowering a precast interceptor vault at golden hour

Cranes, precast, tanks, and skids. Placed to grade, first time.

03 / 04

We connect it.

Mehall crew laying process piping in an excavation

Process piping, power, and controls, tied into a plant that never stopped running.

04 / 04

We start it.

Crew member inspecting a precast vault before backfill

Commissioned, proven against the permit, and handed over running.

[ What we install ]
  • Grease traps and interceptors01
  • DAF systems02
  • pH neutralization skids03
  • EQ tanks04
  • Lift stations05
  • Sampling manholes06
  • Dry wells07
  • Process piping08

One crew, one contract.

We build inside live plants

Production does not stop because we are on site. We sequence around your shifts and your discharge limits.

We stay after startup

After the build, our own service team maintains the system and keeps it compliant. Nothing gets handed off to a stranger.

[ Other civil work ]

Beyond the systems

We do not just install pre-treatment systems. The same crews carry the equipment and capabilities for the civil projects around them.

Four kinds of work, same crews, already on your site.

Motor grader leveling dirt at an industrial site
01

Grading and dirt work

Site grading, excavation, and earthwork for industrial and commercial sites.

Precast dry well ring being set into an excavation
02

Drainage

Storm drains, dry wells, and the structures that move water off your site.

Stormwater retention basin at an industrial site
03

Stormwater retention

Retention basins and stormwater runoff grading, built and maintained.

Concrete pad formwork at an industrial building
04

Industrial pads and concrete

Equipment pads, parking lots, and the flatwork that keeps a facility running.

Industrial facilities

0+industrial facilities served across the Phoenix metro

Food and beverage, manufacturing, and processing plants that discharge to a municipal system.

Municipalities and districts

0+municipalities and districts served across the Southwest

Public agencies that need a contractor who can self-perform both the civil and the mechanical scope.

Have a system to build?

Send us the permit and the site. We will tell you what it takes.