Ireland's water treatment residual (WTR) production rate and reuse situation was investigated to complement the novel research on WTR reuse development in University College Dublin, Ireland. The resulting GIS maps reveal the state of WTR production, disposal and beneficial reuse throughout the country. The total WTR production in Ireland is 15,679 tonnes of dry solids per annum with over 90% of WTR being aluminium-salt-coagulated WTR. Only 8% of WTR is recycled or reused via composting, landspreading, cement manufacturing, constructed wetlands and quarry remediation. The authors recommend that there be further attempts to use WTR in constructed wetlands and cement manufacturing in Ireland.