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New information from HS2/Align indicates a much greater risk of aquifer contamination than previously admitted.
Daily sewage releases into the river could continue into May, but work is underway to tackle groundwater infiltration into Chesham's sewers which is big contributor to this problem.
In March, Thames Water is beginning work to fix groundwater infiltration hotspots in Chesham's sewers.
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Reduced Risk of Sewage for the Chess
Apr 25, 2012
In recent years Thames Water, who manage the Chesham Sewage Treatment works, have been struggling with a system with insufficient storage capacity resulting in untreated sewage being introduced into the River Chess usually during times of sudden, heavy rainfall.
RCA members with Thames Water staff on a visit to Chesham Sewage Treatment Works in 2011
Since 2009, the River Chess Association (RCA) has worked with Thames Water to reduce the number of sewage discharges from the Sewage Works into the river. Over this period we have developed a positive working relationship with Thames Water. Thames Water has now just completed the expansion of the storm water overflow storage, doubling capacity at Chesham, which will greatly reduce the chances of future discharges. We will continue to work with Thames Water on water quality issues and build on this strong partnership. We commend its staff for their efforts in this process.
RCA Chairman, Paul Jennings said, "This development is particularly important at a time when the Chess is suffering from very low flows due to a shortage of water in the subsurface chalk aquifer. At these times the river is less able to dilute pollution events. We are very pleased with the way Thames Water has reacted to this problem."
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