On lots less than 3 acres, what is the maximum percolation rate allowed?

The maximum percolation rate allowed on lots less than 3 acres is 90 minutes per inch. This rate is significant because it influences the design and effectiveness of septic systems. A percolation test measures the rate at which soil absorbs water, which is critical in determining how well a septic system will function. The reason this specific rate is established is to ensure that effluent generated from the septic system can be adequately treated in the soil without causing backups or contamination of surface water.

If the percolation rate were to exceed 90 minutes per inch, it could indicate that the soil has poor drainage capabilities, potentially leading to sanitary issues and ineffective filtration of wastewater. Thus, maintaining this maximum percolation rate helps to ensure that installations are sustainable and environmentally sound, promoting public health and safety.