Identification of groundwater reserve quality based on total dissolved solids in Lamongan district, Lamongan

Groundwater is part of the hydrological cycle located below the earth’s surface in the pores and crevices of rocks and soil. Water scarcity is increasing around the world and the need for water presence is increasing due to growing demands in several fields. Geologically, Lamongan District is composed of alluvium formations and Plio-Plistocene Sediments where alluvium formations consist of keracal, gravel, sand, silt, clay, fossil shell fragments, mud or as coluvium and plio-plistocene sedimentary formations consist of clay rocks, limestone inserts and sandstone. This study was conducted to determine the quality of groundwater reserves based on the value of solute solids. The method was carried out by taking water samples in the wells of residents’ homes in Lamongan District. After data processing was carried out, it was found that the quality of groundwater reserves based on the value of dissolved materials in Lamongan District ranged from 73 ppm – 3187 ppm where the northern area of the study had a higher value of solute substances compared to the southern area of the study.