Favorable climatic conditions and fertile soil are crucial for achieving high agricultural yields. However, recent fluctuations in climate and poor agricultural practices have significantly reduced productivity. Nutrient leaching further depletes soil fertility, necessitating effective nutrient retention strategies. Recycling biosolids in agriculture offers a sustainable solution by converting treated sewage sludge into valuable soil amendments. This practice addresses both waste disposal challenges and the need for nutrient-rich soil conditioners. Biosolids, the by-products of treated domestic and industrial wastewater, are nutrient-rich organic materials with the potential to improve soil properties and enhance crop productivity. Despite their benefits, long-term biosolid application can lead to nutrient pollution, contaminating surface and groundwater with nitrogen (N) and phosphorus (P), posing environmental risks. This chapter explores the current status of biosolids use in agricultural soil modification, the mechanisms of nitrate and phosphate leaching, and the use of software tools for nutrient pollution detection and analysis. Remediation strategies to mitigate nutrient pollution and ensure the safe application of biosolids are also discussed.