Mogden, Hounslow

The old name for the part of south Isleworth now dominated by a Thames Water sewage plant

Hidden London: Mogden wastewater works

Opened in 1936, the Mog­den sewage treat­ment works is one of the largest such plants in south-east Eng­land, treat­ing waste water from a pop­u­la­tion equiv­a­lent of 1.9 mil­lion, across a 60 square mile catch­ment area of north and west Lon­don.

The puri­fied efflu­ent from the plant is piped to Isle­worth Ait, where it is dis­charged into the Thames around high tide. Since the plan­t’s incep­tion, elec­tric­i­ty has been gen­er­at­ed from the waste methane to pow­er the treat­ment works them­selves and in 1993 a com­bined heat and pow­er plant was added.

An upgrade com­plet­ed in 2013 has enabled Mog­den to treat over 50 per cent more sewage, reduc­ing the amount of storm sewage that flows into the Thames when the site becomes over­loaded dur­ing heavy rain­fall and help­ing meet tighter qual­i­ty stan­dards for the dis­charged efflu­ent. Thames Water claims the improve­ments will also reduce odours at the site.

The Crane Walk

The Crane Walk (shown in the small pho­to) runs through the mid­dle of the Mog­den works, beside the Duke of Northumberland’s Riv­er, which was divert­ed as part of the con­struc­tion pro­gramme.

The sur­round­ing local­i­ty is rarely called Mog­den any­more, either because of the name’s asso­ci­a­tion with sewage or because it was nev­er a very attrac­tive word in the first place. Ivy­bridge is the pre­ferred iden­ti­ty both for res­i­den­tial and com­mer­cial devel­op­ments.

Dom­i­nat­ed by four mono­lith­ic tow­er blocks, the council’s Ivy­bridge estate is the largest in the bor­ough and has some of its high­est lev­els of depri­va­tion.

The ‘Mogden formula’ is a sewerage industry pricing structure that seeks to link charges to the volume and strength of trade effluent discharged.

Postcode area: Isleworth, TW7