The conclusions from the EEA European bathing water quality in 2023 report are that the overall outdoor water quality for swimming in #Europe is good. 96% of water measured in bathing sites met the minimum quality standards, and 85% of bathing waters were rated excellent in quality. Sea water has somewhat better quality than inland water.
https://klaava.com/europe/which-european-countries-have-the-cleanest-waters-for-swimming/