Water quality in Cardiff Bay is strictly monitored and graded from excellent to poor. In all open freshwater in the UK there is a risk of catching various infections and diseases, particularly for people who suffer from reduced immunological response.
Types of infections that are common include minor gastro-intestinal complaints; eye, ear and throat infections; typhoid; dysentery; and infectious hepatitis A. The risk is greatly elevated by ingestion of the water. Sports with an increased risk of immersion, such as water skiing, windsurfing and triathlons are permitted only when authorised by the Harbour Authority, strictly managed and water quality dependent.
Whilst immunisation can reduce the risk of contracting certain diseases, there are others for which there is no vaccine protection available, eg Weil’s disease (leptospirosis). Weil’s disease is rare and the risk of contracting it is very low, but it can cause serious, even fatal, illness.