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(b) School Pools. One private school has a small swimming pool
without filtration plant, the water being changed as necessary,
sterilization being carried out by hand dosing by hypochlorite.
Seven primary schools have swimming pools with treatment plants.
In addition to numerous pool-side chemical tests, 78 samples of water
were taken for bacteriological examination, of which one was reported as
having a count higher than desirable due to inadequate chlorination.
3. RIVERS AND STREAKS.
The River Thames forms the western boundary of the Borough said
is under the control of the Thames Conservancy. The Hogsmill River,
a tributary of the Thames, for some two miles forms the eastern boundary
and thence flows through the Borough. In dry weather a considerable
portion of the flow of this river comprises the effluent from the
Hogsmill Valley Sewage Treatment Works. The Beverley Brook, another
tributary of the Thames, forms part of the eastern boundary and receives
the effluent of the Worcester Park Sewage Disposal Works.
The pollution of the rivers has been a matter of concern to the
department and in particular from litter and waste arising from house
boats occupied by river-side dwellers. Members of the general public
can do much to reduce the nuisance from litter and the practice of
dumping large pieces of unwanted furniture, mattresses, prams and
similar items can produce hazards in streams which would otherwise be
attractive amenities and the Council has restricted the use of riverside
moorings in its ownership to non-residential use and this should
make a useful contribution to the cleanliness of the river.
Whilst the quality of the water in the Thames is improving it is
not fit for bathing.
4. DRAINAGE AND SEWERAGE.
With the exception of a small quantity which is discharged to the
sewage disposal works of the London Borough of Sutton at Worcester
Park and to the Greater London Council Wandle Valley Works, the sewage
of the district is treated at the Hogsmill Valley Sewage Treatment Works.
This modern plant also deals with the sewage from the Borough of Epsom
& Ewell.
With the exception of a few houses, all dwellings are connected
to the main sewerage system.