3.4 Innovative approaches such as Payment for Ecosystem Services (PES) to be explored for catchment protection in vulnerable regions. 2025. 3.5 Establish desalination or rainwater facilities in most vulnerable areas with inadequate other sources of potable water. 2024. 3.6 Minimize the level of Non-revenue Water (NRW) as a water conservation / efficiency improvement measure in all water supply schemes. 2025. NDC 4.