Decentralized light greywater (LGW) treatment and reuse can help mitigate urban water scarcity, yet data on its characteristics at the household level in Latin America remain scarce, limiting system design and implementation. This study assessed LGW quantity and quality in a representative household in Bucaramanga, Colombia, and analyzed its implications for decentralized treatment and reuse. Potable water consumption and LGW production from showers and hand basins were monitored over 98 and 124 days, respectively, with 27 LGW samples collected for quality analysis. Results showed that LGW production was 33.83 ± 4.10 (L/person)/day, accounting for 21% of household potable water consumption, with no significant differences across days of the week. Showers contributed 94% of LGW, while hand basins accounted for 6%. The volume of LGW was sufficient to meet toilet flushing demands (10% of potable water consumption) and could also support other accepted uses, such as floor cleaning and garden irrigation. LGW quality exhibited high variability, low nutrient content (6.37 ± 1.84 mgN/L and 0.74 ± 0.33 mgP/L), high organic matter concentrations (COD: 879.68 ± 163.51 mg/L
BOD