For a property with limited space, that requires the smallest possible leach field size, an enviro septic system is ideal. This is because the leach field size remains constant, whether the percolation rate ranges from 1-40. For example, the enviro septic system footprint for a three-bedroom home is 384 sq. ft., whether the perc rate is optimal (low) or poor (high).  Conversely, the septic system footprint for pipe and stone or concrete chamber systems can increase or decrease according to the property’s perc rate.