The Queensland Government has a site devoted to environmental incidents and disaster recovery (https://www.qld.gov.au/environment/pollution/management/disasters) including a range of information about chemicals and specific investigations on the historic use of firefighting foam at Queensland sites.
The Commonwealth Department of Health hosts a range of environmental health publications at http://www.health.gov.au/internet/main/publishing.nsf/Content/health-pubhlth-publicat-environ.htm including guidance on environmental hazards, legionella control, the use of rainwater tanks, PFAS and toxicity testing in water.
Queensland Health also publishes periodic notifications, including notifiable conditions at https://www.health.qld.gov.au/clinical-practice/guidelines-procedures/diseases-infection/surveillance/reports/notifiable. While these include all notifications, not those specifically relating to public health conditions relating to drinking water or sewerage services, the data is viewable by region and may be useful as members place greater focus on issues like health based targets for microbial water quality.
The Department of Defence provides information on investigation and management of its national program to review, investigate and implement a comprehensive approach to manage the impacts of PFAS on and in the vicinity of its bases around Australia - see http://www.defence.gov.au/Environment/PFAS/