Insights

Greene Economics led the 2025 update of Thurston County’s On-Site Sewage System Management Plan to meet new state code and strengthen public and environmental health protections for drinking water, shellfish beds, and Puget Sound. The plan targets vulnerable on-site sewage systems—especially in sensitive and flood-prone areas—enhances data and climate change planning, protects sensitive watershed, and supports more than 55,000 systems serving homes and businesses countywide.

Greene Economics supported a benefit-cost analysis of California’s Early Earthquake Warning (EEW) system for the Governor’s Office of Emergency Services, supporting research data modeling to quantify system benefits. The study identified measurable gains across public safety, infrastructure, and business sectors and highlighted opportunities to strengthen and expand EEW use statewide.