Webother threats include not just drought but also prolonged heavy rainfall, which can cause harmful wastewater to contaminate the supply. Because the system is. Webup to 68 per cent of water supplies in the region are at risk of failure during drought conditions. It has the lowest rainfall in the country. Webcurrently dublin and its surrounding counties are heavily dependent on the river liffey for water supply. The government says this dependence on the liffey and. Webuisce éireann says 37% of drinking water nationally, and 33% in the greater dublin area, is lost to leaks before it ever reaches our taps. But what i'm learning on my. Webthe government says this dependence on the liffey and two treatment works in county kildare has created a ‘serious vulnerability’ to risks such as prolonged drought. Webtypically, water availability in dublin and the eastern region has been on average just 1 per cent above demand. There is every likelihood the extent of drought. This dependence on the liffey (and the two main treatment plants of.