A warning is in place after sewage has been discharged into the sea in two areas of west Dorset.
Surfers Against Sewage is tracking real-time sewage discharge and pollution risks around the UK.
Following heavy rainfall, pollution alerts have been put in place in West Bay and Lyme Regis.
The Church Cliff Beach and the Fossil Beach in Lyme Regis have been affected by storm sewage.
The service said: "Pollution Alert: Storm sewage has been discharged from a sewer overflow in this location within the past 48 hours.
"Bathing is not advised today due to the likelihood of reduced water quality."
Surfers Against Sewage monitors water quality at over 450 river and coastal locations across the UK to warn residents and tourists about the water quality.
A pollution alert has also been issued in Sandsfoot Castle beach in Weymouth.
Sewage discharges can be tracked via an interactive map on the Surfers Against Sewage website: https://www.sas.org.uk/water-quality/sewage-pollution-alerts/
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