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To comply with the Freshwater Fisheries Directive (FFD) the ammonia discharge levels at the Castleford Water Treatment Works had to be reduced from 40 milligrams / litre (mg/l) to 10mg/l by 31 September 2014. To achieve this, the works was in need of modernisation and upgrading to increase its current treatment capacity and improve its discharge quality.

£16m of investment was allocated for the improvements to enable the works to serve a 2025 population equivalent of approximately 57,082; which is a 21.5% increase from present figures.

As a result of the growth in population a further compliance date of 31 March 2015 was applied to the scheme. IWS was selected as MGJV’s mechanical contractor for the project. The Castleford project exemplifies open, honest and collaborative working between all parties to ensure the project’s vision and strategy was met.

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