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Crystal Project

Project elements

New treatment works, raw water supply and treated water outlet

Plant type

3-stage DAF process

Area supplied

Douglas, Onchan, Braddan and the south of the island

Production capacity

37M 1/day

Average demand


26M/l day


35M/l day


66km large-diameter raw water; 1,200km treated water

Project costs

Supply Extent

31,000 connections over 250 square miles

Anticipated per capita consumption


150 l/day


185 l/day

Sulby WTP

£12.3 Million

Tynwald approve funding

June 1999

Planning approval

October 2004

Contract awarded

27 May 2005

Scheduled duration

33 months

Work commenced (Douglas WTP)

June 2005

Sulby works connected into supply

September 2005

Sulby works completed

October 2005

Raw water main contract awarded

October 2005

Raw water main construction began

January 2006

Treated water pipeline work commenced

June 2006

Treated water pipeline completed

August 2006

WTP concrete poured

August 2006

Raw water main completion

December 2006

Douglas WTP (construction and installation) completed

October 2007

Commissioning period

January/ February 2008

Glencrutchery WTP decommissioning began

February 2008

Official opening

2nd May 2008


Isle of Man Water Authority

Main contractor

Earth Tech Engineering

Telemetry and PLCs

Mitsubishi Electric

Main sub-contractor

Lagan Construction

Treated water pipeline

Mann Construction

Treated water pipeline partner

Manx Gas



Raw water main

Island Drainage & Groundwork

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