Indra, R.D., Rachman, A.S. , Wafiyuddin, W. and Soedjono, E.S. 2024. Strategy to Improve the Performance of The Ngagel I Water Treatment Plant (IPA) in Pdam Surya Sembada Surabaya City Through Increasing Pump Efficiency. Jurnal Indonesia Sosial Teknologi. 5, 2 (Feb. 2024), 527–539. DOI:https://doi.org/10.59141/jist.v5i2.925.