Question reference: S6W-00499
- Asked by: Ross Greer, MSP for West Scotland, Scottish Green Party
- Date lodged: 4 June 2021
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Current status: Answered by Michael Matheson on 17 June 2021
Question
To ask the Scottish Government what action it is taking in response to concerns that there is an increased risk of pollution from sewage in Luss Bay and across Loch Lomond following heavy rainfall events, which are reportedly increasing in frequency.
Answer
Luss Bay has a designated Bathing Water and is given special protection to ensure it is safe for people to swim in during the bathing season, which normally runs from 1 June to 15 September. The Scottish Environment Protection Agency (SEPA) has determined the current bathing water quality classification at Luss Bay as 'sufficient" and reports that there has not been any significant deterioration in annual trends at this location. The storm rainfall event last summer on 5 August 2020, did result in a poor water quality, but this was predicted by SEPA, and an appropriate poor water quality warning to the public was in place via SEPA’s real time electronic signage.
The public sewerage network in Luss, including Luss Bay, is a relatively small catchment and there are no combined sewer overflows from Scottish Water’s network in this vicinity to Loch Lomond. The Luss public sewerage network drains to Scottish Water’s Waste Water Treatment Works (WwTW). During the bathing season, to protect bathing water quality, Luss WwTW uses ultraviolet treatment to disinfect the sewage effluent. Scottish Water works with SEPA very closely and through regular monitoring has not found issues with respect to its discharge in the area. The final effluent discharge from the WwTW is sampled on a regular basis and Scottish Water is not aware of breaches of its license parameters.
Overall, SEPA classifies the environmental water quality of Loch Lomond as good for the north area and moderate for the south due to impacts from agriculture. Through River Basin Management Planning, carried out by SEPA on behalf of the Scottish Government, measures are planned to address the impacts from agriculture to ensure Loch Lomond can recover to good water quality status. SEPA and Scottish Water have also worked together to inspect the sewer network along the beach area at Luss Bay and no issues have been discovered.
Of course, the Scottish Government will continue to work together with stakeholders to ensure bathing waters reach the best possible status.