Raw sewage can discharge from the Combined Sewer Overflows (CSOs) at Mawgan Porth. If you want to know when your surf spot is polluted in real time, sign up to SAS's Sewage Alert Service at www.sas.org.uk/sewage-alert-service/ and receive a free text when the CSOs discharge raw sewage.
The Sewage Alert Service covers over 200 beaches around England and Wales. The CSOs at Mawgan Porth are at Trenance Porth Pumping Station and Mawgan Porth Pumping Station (River Menalhyl). SAS are working with South West Water to ensure you know when there's a raw sewage spill at Mawgan Porth. Diffuse pollution can also impact the water quality at Mawgan Porth. For more information on Mawgan Porth you can also look at: http://www.environment-agency.gov.uk/static/documents/bwprofiles/BW_32500_Mawgan_Porth.pdf