Welcome to Cardno BTO

Cardno welcomes its new merger partner Better Technical Options Ltd. (BTO), merging to form Cardno BTO in August 2012.

Cardno BTO is a specialist water and wastewater treatment engineering consultancy based in Wellington, New Zealand.

Cardno BTO was founded by its two Principal Engineers, Mike McCoy and Simon Cartwright, who saw an opportunity for an engineering consultancy with the following points of difference:

  • Providing a client-focused professional engineering service dedicated to the water and wastewater industry.
  • Supplying the best technical options to suit clients’ specific needs in the timeframe promised.
  • Developing strong client relationships; clients return to Cardno BTO, time and again, to engage them for additional water and wastewater engineering projects.

Mike and Simon established BTO in 2006 and, after six years of successful business growth, saw further development opportunites in merging with Cardno.


The Cardno BTO team consists of Process, Electrical, and Mechanical Engineers working on a wide range of water and wastewater processes, ranging from traditional to ‘cutting edge’ technologies.
Areas of expert knowledge include: water and wastewater process option selection and design, process optimiztion, process risk assessment, mechanical design, instrumentation selection, automation systems design, electrical design, telemetry system and plant commissioning.


The majority of Cardno BTO clients are public sector organizations, but they also have industrial clients.
Cardno BTO has had long-term and ongoing involvement with clients such as Kapiti Coast District Council (NZ), Wanganui District Council (NZ), Capacity Infrastructure Services (NZ), and Carpentaria Shire Council (Queensland, Australia), as well as some of the larger water and wastewater operators in Australasia, such as Watercare Services (Auckland, NZ), Greater Wellington Regional Council and Queensland Urban Utilities.