It is not recommended to put pavers or any solid materials over a leach field. Paving over the drain field can hinder the crucial process of evaporation, which plays a significant role in the treatment of effluent. The leach field requires proper aeration and interaction with the atmosphere to facilitate evaporation and natural filtration of wastewater. Blocking this process with pavers can lead to the accumulation of excess moisture, potentially causing the leach field to fail and disrupting the proper functioning of the septic system.