August 22, 2024, Center for Environmental Health of Pesantren Universitas Nahdlatul Ulama Surabaya (CEHP UNUSA) conducted a site survey activity. This survey activity was carried out by the Head of CEHP Achmad Syafiuddin, and Ahmad Jazuly Nabil as Laboran Staff. The purpose of this survey was to check the water quality at the Pesantren Az-Zahra. Water quality examination includes Turbididy, Total Dissolved Solid (TDS), pH, Salinity, Taste and Odor. After obtaining the results of the water quality examination, then determine the location of the installation of the UNUSA-Water clean water filter in the water source that has the best quality compared to other sources. Pesantren Az-Zahra Islamic is directly cared for by Ustadz Abdul Somad.