Long-term wastewater and precast infrastructure for our customers and the environment

Founded in 1979

A well established company

In 1979, using a local gravel reserve for raw materials, operations to manufacture a range of general precast concrete products began near Tullamore, Ireland. In 1983, the company commenced manufacturing precast concrete tanks. Throughout the 1980's, the company expanded it’s factory and invested in plant and moulds to increase production capacity.


New environmental standards in the 1990’s required on site effluent treatment systems to improve the quality of water discharged by incorporating secondary and tertiary treatment technologies. Subsequently, Molloy acquired the wastewater treatment business of Atlas Oil Environmental and developed the most comprehensive offering of wastewater treatment plants in the marketplace for both single houses and large developments.

In 2006, to facilitate expansion, the company purchased a new site and now operates from a modern factory and offices at Coleraine, Clara Road, Tullamore, Co. Offaly, Ireland. This location features an extensive courtyard where fully operational models of the company's products are on display. It also features Ireland’s most comprehensive percolation demonstration facility to indicate to homeowners and construction professionals how to build percolation areas.

Today, the company engages in research and development with world leading universities, and has come to be recognised as a leader in the manufacture of wastewater treatment plants and sewage pumping stations for the domestic, commercial and municipal sectors in Ireland.

Sustainable design

Responsible operations

Product energy efficiency
Water stewardship

Comprehensive product offering

Standard or made-to-order design

Decades of experience, give us a crucial advantage in allowing for systems to be purpose-built, on time, and made to last.

Why Molloy

The complete solution for your wastewater project

Molloy bring together everything that's required to have a reliable on-site wastewater treatment plant or sewage pumping station for your home, business, or large development. We also manufacture precast concrete tanks, general precast products, paving and much more.

Design & Engineer

From packaged systems to tailored designs for large or bespoke projects, we will partner with you to ensure an efficient and cost effective system is specified for your site.


Our modern facilities and decades of experience, give us a crucial advantage in allowing for components to be purpose-built, on time, and made to last.

Install & Commission

Our tanks are typically delivered to site, and we perform final assembly and testing of the mechanical and electrical equipment, ensuring system is ready for handover.


Maintenance and remote monitoring options are available. These are focused on extending a system’s lifespan and ensuring its operational efficiency.

Awards and certificates

Committed to excellence

Molloy products have been awarded the highest certification standards, and the company recognises the value of professional and independently certified management systems. In addition, we are proud members of leading bodies in the wastewater, engineering and construction industry.

This ensures that the system in place at your development is safe and reliable, and that you are dealing with a company committed to excellence.


For a future proof wastewater system or precast tank, get in touch on 057 93 26000 or 01 901 1999