Leading the way in delivering high-quality, value-driven projects globally

Nicholas O’Dwyer has delivered wastewater collection, treatment and disposal facilities in an environmentally sustainable and socially conscious manner for almost 100 years. We have delivered high-quality, value-driven projects in small villages and large towns and cities in Ireland, the UK and overseas.

Effective wastewater treatment is crucial to public health, and as many nations face even higher demands, wastewater treatment is an essential means of ensuring we balance our ecosystems.

We offer a highly flexible approach that meets our clients’ needs and adapts to changing requirements over the full lifecycle of a project. We are leaders in innovative design and strategic management and continue to match the latest technologies and industry developments to provide the right solution for our clients.

Our expertise

  • Master planning
  • Technical and economic feasibility studies
  • Preliminary design
  • Risk management
  • Optioneering of alternative designs
  • Conceptual and detailed designs and contract documents
  • Construction management and supervision
  • Contract and project management
  • Training and capacity building
  • Operational monitoring


  • Provided wastewater engineering to authorities serving more than five million consumers
  • Engineered water sector projects with a construction value of more than €5 billion
  • Managed individual projects with a capital spend of more than €150 million
  • Supplied over a million man-hours of engineering services to the water industry
  • Worked in more than 46 countries throughout the developing world
  • Tendered and administered projects under Irish Government, FIDIC and European Union conditions of contract.

Our latest wastewater projects