Devianto, L. A., Hardianto, Y. Z. M. Y., Yusuf, A. ., Christiandy, W. ., Elviliana, E. . and Haji, A. T. S. . (2026) “Preliminary Assessment of Spring Water Sources as Raw Water using the Weighted Arithmetic Water Quality Index in Batu City, Indonesia”, Envirotek : Jurnal Ilmiah Teknik Lingkungan, 18(2), pp. 106–114. doi: 10.33005/envirotek.v18i2.2393.