Colm Cahill

Principal Consultant, Water & Sanitation

A chartered civil engineer with over 15 years’ experience in water/wastewater engineering, including international development and humanitarian response.

Colm’s diverse experience includes 5 years as a consulting engineer in the water industry in Ireland, 8 years working in the international development/humanitarian WASH sector as well as 2 years in the water utility sector.

As a consulting engineer, Colm has been involved in the design and contract management of numerous water/wastewater infrastructure projects, including flood relief schemes, sewerage schemes and water supply projects. 

As WASH Coordinator for 3 years in South Sudan, Colm led a rural WASH programme providing vital water and sanitation infrastructure as well as supporting associated institutions on policy development and service delivery. 

He has also worked as a Water Conservation Specialist in the utility sector, with responsibility for prioritising investment, developing regional water conservation strategies and providing technical solutions to reduce leakage. 

Currently with IMC, Colm is Lead Designer for Networks on the EMS to Rehabilitate Freetown’s Water Supply System in Sierra Leone, where he has led the detailed design of over 70km of watermains, including new networks incorporating pressure managed areas.  


  • Chartered Engineer with Engineers Ireland (CEng MIEI)
  • MSc in Civil Engineering (Distinction), Trinity College Dublin
  • BA, BAI, Degree in Civil, Structural & Environmental Engineering (First Class Hon.), Trinity College Dublin


Select projects

  • Preparatory design, specification and contract packaging for rehabilitation works for Freetown’s Water Supply system (2016)
  • Engineering Management Services (EMS) to Rehabilitate Freetown’s Water Supply System, Sierra Leone (2017 – Ongoing)
  • Dreampipe – Independent Verification Services (2018)