McNish Water is a leader in custom-engineered equipment for the water and wastewater industry. Built on a deep commitment to clean water and sustainable infrastructure, McNish brings together three trusted brands — Walker Process Equipment, Amwell, and E&I — each with decades of experience delivering proven, high-performing solutions for municipal and industrial applications.

Together, our brands support critical treatment processes from headworks and clarification through anaerobic digestion and biological treatment, giving consulting engineers, plant owners, and operators a single, reliable source for equipment that performs over the long haul. Walker Process Equipment brings deep expertise in clarification and biological treatment systems; Amwell specializes in clarification, collectors, and grit removal equipment; and E&I delivers rakes, screens, and collectors for headworks and fine screening applications.

Backed by this combined engineering depth and field-proven performance, McNish Water equipment is trusted across the industry for reliability, durability, and long-term environmental stewardship.