<p>This study examines the granulometric properties, geochemical composition, and heavy metal contamination in sediments of Putheri lake cluster. Granulometric analysis revealed sediment textures ranging from very fine-grained to coarse-grained, with sorting varying from well-sorted to poorly sorted. Skewness ranged from coarse to strongly fine-skewed, and kurtosis ranged from platy kurtic to extremely leptokurtic, indicating a complex depositional environment. Textural analysis showed that sand content ranged from 67.87% to 78.41%, with silt and clay comprising smaller proportions. Organic carbon (OC) varied significantly (0.41%–9.32%), while calcium carbonate (CaCO₃) ranged from 7.5% to 36.25%. Heavy metal concentrations, including Cu, Cr, Cd, Co, Fe, Mn, Ni, Zn, and Pb, were analyzed, while concentrations were generally below global background values. Pollution indices, including contamination factor (CF), enrichment factor (EF), ecological risk index (ERI), and geo-accumulation index (Igeo), were calculated. Cd exhibited the highest contamination and ecological risk, while metals such as Cr and Ni also indicated moderate contamination. The pollution load index (PLI) suggested that the overall sediment pollution level ranged from no pollution to moderate pollution. Correlation analysis indicated a negative relationship between sand and silt percentages, with clay and OM showing positive associations and the principal component analysis (PCA) identified key contributors to contamination, with Ni, Co, Cu, and Cr showing high factor loadings in first component, explaining 70.64% of variability. This study underscores the need for continuous monitoring to prevent ecological risks associated with sediment pollution.</p>