Josiah Holst, PE, CFM, is the Missouri Regional Manager for HR Green’s Water Business Line.
As Missouri Regional Manager for HR Green’s Water Business Line, Josiah Holst, PE, CFM, provides strategic leadership and technical oversight for water, wastewater, and stormwater projects throughout the region. He brings extensive experience in stormwater master planning, having successfully completed more than 10 watershed and stormwater master plans in the St. Louis region alone, as well as flood mitigation, utility infrastructure, water and wastewater treatment, conveyance systems, and capital improvement program development.
Known for his collaborative approach, Josiah regularly leads public outreach, stakeholder engagement, and permitting efforts for complex infrastructure projects. He works closely with municipalities, regulatory agencies, and residents to develop practical solutions that balance technical requirements, community priorities, and long-term system resiliency. His experience guiding communities through stormwater master planning, funding prioritization, and implementation strategies helps clients establish clear, actionable paths for addressing infrastructure needs and reducing flood risk.