Watford Swimming Club has a fast improving open water programme led by Jeremy Irvine. Open Water season begins towards the end of April and runs right through to the end of September.

All swimmers are welcome to come down to Denham lake to have a go at open water swimming. Many swimmers then decide they want to compete at local, regional and national open water championships.

The lake charges £5 per person and is paid on arrival. Wetsuits are optional, if you own one then bring it along as it’ll enable you to swim longer.

Be aware that people swim at own their own risk. There are spotters, life savers and a rescue boat.

If you would like more information then please contact Jeremy Irvine at: [email protected]

Training Times:


  • Meet: 6:45pm / In Water: 7:00pm


  • Meet:- 7:15am / In Water: 7:30am

Lake Location:

Visit our FACILITIES page for the location of the lake.