Treyarnon Bay water quality history

Explore historical Environment Agency samples and annual bathing water classifications for Treyarnon Bay in Cornwall.

Treyarnon Bay is on the north coast of Cornwall. It is a rural sheltered sandy bay approximately 200 metres wide, backed by sand dunes and cliffs. A stream flows across the beach towards the sea, spreading out over the sand at low tide. There are also rock pools to explore.

Available sample history
1988 to 2026
Samples
681
Latest official classification
Excellent (2025)

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Annual classification history

Official assessments and historical estimates are labelled separately. Missing years are not filled in.

Available annual results, newest first
YearClassificationAssessment source
2025ExcellentOfficial Environment Agency assessment
2024ExcellentOfficial Environment Agency assessment
2023ExcellentOfficial Environment Agency assessment
2022ExcellentOfficial Environment Agency assessment
2021ExcellentOfficial Environment Agency assessment
2019ExcellentOfficial Environment Agency assessment
2018ExcellentOfficial Environment Agency assessment
2017ExcellentOfficial Environment Agency assessment
2016ExcellentOfficial Environment Agency assessment
2015ExcellentOfficial Environment Agency assessment
2014ExcellentOfficial Environment Agency assessment
2013ExcellentOfficial Environment Agency assessment
2012ExcellentOfficial Environment Agency assessment
2011ExcellentOfficial Environment Agency assessment
2010ExcellentOfficial Environment Agency assessment
2009ExcellentHistorical estimate
2008ExcellentHistorical estimate
2007ExcellentHistorical estimate
2006ExcellentHistorical estimate
2005ExcellentHistorical estimate
2004ExcellentHistorical estimate
2003ExcellentHistorical estimate
2002ExcellentHistorical estimate
2001ExcellentHistorical estimate
2000ExcellentHistorical estimate
1999ExcellentHistorical estimate
1998GoodHistorical estimate
1997GoodHistorical estimate
1996GoodHistorical estimate
1995GoodHistorical estimate
1994GoodHistorical estimate
1993GoodHistorical estimate
1992GoodHistorical estimate
1991GoodHistorical estimate
1990ExcellentHistorical estimate
1989Not assessedHistorical estimate
1988Not assessedHistorical estimate

Source: Environment Agency / Swimfo. Data retrieved 16 October 2026. Historical trends do not describe conditions today; check Swimfo and local notices for current advice.

Nearby bathing waters