What is the minimum size of a water main required by the IEPA?

The minimum size of a water main specified by the Illinois Environmental Protection Agency (IEPA) is 4 inches in diameter. This specification is based on several factors, including the need for adequate water pressure and flow rates to service residential and commercial needs. A 4-inch diameter allows for sufficient capacity to meet the demands of firefighting, hydrant operations, and general water distribution while maintaining adequate pressure within the system.

Choosing a size smaller than 4 inches would likely result in insufficient water flow and pressure, which can hinder service delivery, especially during peak usage times or emergencies. Larger sizes, while they can provide higher flow rates, may incur unnecessary costs if not required by the actual demand in the area being serviced. This regulation ensures a balance between efficient water distribution and cost-effectiveness in infrastructure.