(404) 301-4041

★ Local & Family-Owned

Big Enough to Serve You,
Small Enough to Know You

Metro Atlanta's trusted onsite services partner

10+
Years Experience
200+
Units Available
24/7
Emergency Service

At MAS Onsite Services, you're not just a number. We're a family-owned business with the fleet, the crew, and the commitment to handle projects of any size — while still giving you the personal attention you deserve.

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Self-Contained Water & Waste Systems for Any Jobsite

The Wet Block by MAS Onsite delivers a complete range of self-contained waste and water systems designed to support modular offices, jobsite trailers, workforce housing, and remote facilities where permanent utility hookups are unavailable.

Whether you need a complete waste and water solution, a dedicated fresh water supply unit, or a high-capacity waste-only system, MAS Onsite offers multiple Wet Block configurations to match your site demands.

Wet Block systems are heated, rugged, and essential for jobsite deployments across the Southeast.

Why Choose the Wet Block by MAS Onsite?

The Wet Block by MAS Onsite product line delivers a rugged, scalable solution for managing fresh water supply and wastewater containment on sites without direct water and sewer connections. Built specifically for demanding environments, Wet Block units provide dependable infrastructure for modular offices, temporary buildings, and jobsite facilities, allowing crews and teams to operate comfortably and efficiently.

Every Wet Block is designed to support real-world conditions, featuring integrated pump systems and heated cold-weather protection to help prevent freezing and keep systems functioning during winter projects. With multiple capacity options available, MAS Onsite makes it easy to select the right setup for your application, whether you are supporting a single modular office or a full multi-unit facility deployment.

Key Features and Benefits

⚙️ Self-Contained Water and Waste System
🔥 Heated for Cold Weather Operation
🏢 Designed for Modular Offices and Temporary Buildings
💧 Integrated Pump Systems for Reliable Performance
📐 Scalable Options for Small or Large Site Deployments
⏱️ Reduces Setup Time and Limits Downtime
📍 Ideal for Remote Sites Without Utility Hookups

Wet Block Options

Standard Wet Block

Complete Waste and Water System

📐5Lx8Wx5H
💧270 Gallon Water Tank
🗑️330 Gallon Waste Tank
⚙️Sewage Pump and Water Pump
120V 20A Power Requirement

Ideal For: Modular offices, jobsite trailers, remote facilities, temporary buildings.

Included: 2 in Male Camlock Ball Valve and 30 Amp to 15 Amp 110 Adapter Plug

Standard Wet Block

The Standard Wet Block by MAS Onsite is a compact, self-contained fresh water and wastewater holding system designed specifically for modular offices, jobsite trailers, and remote site facilities. With 270 gallons of fresh water capacity and 330 gallons of waste storage, this unit provides a reliable solution for sites without direct utility hookups.

Water Only Wet Block

High-Capacity Fresh Water Supply System

📐5Lx8Wx5H
💧660 Gallon Water Tank
⚙️Water Pump Only
120V 20A Power Requirement

Ideal For: Modular offices, handwash stations, remote sites, temporary facilities needing water supply.

Included: 30 Amp to 15 Amp 110 Adapter Plug

The Water Only Wet Block is a high-capacity, self-contained fresh water storage and pumping system built for modular offices, restroom trailers, jobsite handwash stations, and remote workforce facilities. Featuring 660 gallons of fresh water, this unit delivers consistent pressure and dependable performance for sinks, toilets, and showers year-round.

Waste Only Wet Block

High-Capacity Waste Holding System

📐5Lx8Wx5H
🗑️660 Gallon Waste Tank
⚙️Sewage Pump Only
120V 20A Power Requirement

Ideal For: Modular office complexes, jobsite restroom support, remote sites without sewer access.

Included: 2 in Male Camlock Ball Valve and 30 Amp to 15 Amp 110 Adapter Plug

The Waste Only Wet Block is a self-contained wastewater holding and pumping solution engineered for modular offices, portable restrooms, restroom trailers, and jobsite facilities that require dependable sewage management. With 660 gallons of waste capacity and a dedicated sewage pump system, it efficiently handles wastewater removal in locations without sewer tie-ins.

Wet Block 820 Container

Heavy-Duty Large Capacity Waste and Water System

📐8Lx20Wx8.6H
💧1,550 Gallon Water Tank
🗑️2,100 Gallon Waste Tank
⚙️Sewage Pump and Water Pump
240V 50A Power Requirement

Ideal For: Large modular office complexes, industrial projects, workforce housing, disaster response staging.

The Wet Block 820 Container is a heavy-duty, large-capacity self-contained water and waste management system designed for large-scale modular office complexes, workforce housing, remote industrial sites, and multi-unit temporary facilities. Built in an 8×20 footprint, this unit provides 1,550 gallons of fresh water storage and 2,100 gallons of wastewater capacity.

Ideal Applications

01 🏢

Modular Office

The Wet Block is an essential support system for modular office deployments where reliable plumbing infrastructure is required without permanent utility hookups. By providing self-contained fresh water storage and wastewater capacity, the Wet Block allows office modules to operate with full restroom and kitchen functionality.

02 🏗️

Industrial Job Sites

Industrial and commercial job sites demand equipment that can handle heavy use, harsh environments, and continuous operation. The Wet Block delivers a rugged, jobsite-ready water and waste solution that supports daily workforce needs without disrupting productivity.

03 🚨

Disaster Response

When emergency response situations require immediate site infrastructure, the Wet Block provides a fast, dependable solution for fresh water supply and waste containment. Built for rapid deployment, these self-contained systems support temporary facilities such as command centers and workforce staging areas.

Get a Quote on a Wet Block System Today

Whether you’re supporting a modular office complex, a remote jobsite, or a long-term deployment, the Wet Block delivers the dependable water and waste infrastructure you need, without relying on permanent utility hookups. Our team will help you choose the right model based on capacity needs, service frequency, and site conditions.

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