DISCLAIMER Data provided on this website has NOT been subjected to Quality assurance and is provided by Cardiff Harbour Authority in good faith for general information purposes only. Users who wish to investigate specific issues are advised to contact Cardiff harbour Authority with details of their enquiry. The map below shows sites within Cardiff Bay that are used for monitoring water quality. Click on a site below to obtain data from that site.

Information is currently available for bacteriological quality, combined river flow and data from site 4, site 10 and site 17.  Other sites will be added in the future.