West Mersea water quality history

Explore historical Environment Agency samples and annual bathing water classifications for West Mersea in Colchester.

West Mersea is a small Island connected to the mainland by a causeway, it is situated between the estuaries of the Colne and Blackwater rivers. The beach has sand and pebbles and is backed by grassland and beach huts. At low water there is a large expanse of mud. There are views over the Blackwater estuary.

Available sample history
1991 to 2026
Samples
713
Latest official classification
Good (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
2025GoodOfficial Environment Agency assessment
2024GoodOfficial Environment Agency assessment
2023ExcellentOfficial Environment Agency assessment
2022ExcellentOfficial Environment Agency assessment
2021GoodOfficial Environment Agency assessment
2019GoodOfficial Environment Agency assessment
2018SufficientOfficial Environment Agency assessment
2017SufficientOfficial Environment Agency assessment
2016GoodOfficial Environment Agency assessment
2015GoodOfficial Environment Agency assessment
2014ExcellentOfficial Environment Agency assessment
2013ExcellentOfficial Environment Agency assessment
2012ExcellentOfficial Environment Agency assessment
2011GoodOfficial Environment Agency assessment
2010GoodOfficial Environment Agency assessment
2009GoodHistorical estimate
2008GoodHistorical estimate
2007SufficientHistorical estimate
2006SufficientHistorical estimate
2005SufficientHistorical estimate
2004SufficientHistorical estimate
2003SufficientHistorical estimate
2002SufficientHistorical estimate
2001SufficientHistorical estimate
2000SufficientHistorical estimate
1999PoorHistorical estimate
1998PoorHistorical estimate
1997PoorHistorical estimate
1996PoorHistorical estimate
1995PoorHistorical estimate
1994PoorHistorical estimate
1993PoorHistorical estimate
1992PoorHistorical estimate
1991Not 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