Kholidah, H., Arifin, M. and Widjajani, B. W. (2022) “WATER QUALITY POLLUTION INDEX ANALYSIS IN DOWNSTREAM OF PORONG SUB-WATERSHED, JABON DISTRICT, SIDOARJO REGENCY”, AQUASAINS, 11(1), pp. 1189–1200. doi: 10.23960/aqs.v11i1.p1189 - 1200.