- Apr 18: Department of Homeland Security Fiscal Year 2024 Flood Mitigation Assistance – Application Deadline
- Apr 21: 36th Annual AHS Symposium – Abstract Deadline
- Apr 22: Earth Day 2025
- Apr 22: ASU Water Institute’s Earth Day Special Event: Poisoning the Well: How Forever Chemicals Contaminated America – WRRC Co-Sponsored Event
- Apr 22: Tempe Town Lake Earth Day Cleanup
- Apr 24: U of A ALVSCE 2025 Research Showcase
- Apr 27: Lincoln Vibrant Communities Fellows Program – Land and Water Planning June 2025 – Application Deadline
- Apr 28–29: CLE Law of the Colorado River – Looking to the Future: A New Operations Pardigm
- Apr 28–30: AWRA 2025 Spring Conference: Development Risks & Challenges in Changing Climate Conditions
- Apr 29: UCOWR Webinar: Public Health Applications for Water Resources Management; Dr. Anna Gitter
- Apr 29–May 1: Santa Cruz River Research Days: Building on Successes
- Apr 30: NVIS Spring 2025 Seminar Featuring Renee Tsinigine: Look to the Mountain: Indigenous Resiliency, Community Leadership, and Partnership Building; 12:00 pm – WRRC Co-Sponsored Event
- Apr 30: AWSISA Africa & Global South Water and Sanitation Dialogue: Towards Sustainable Water and Sanitation Services – Abstract Submission Deadline
- May 6–7: Tribal Environmental Health Forum 2025: Bridging Generations in Resilience: Mobilizing Communities for Future Generations
- May 7: AWRA Student Scholarships and AWRA Awards – Application/Nomination Deadline
- May 9: 34th Annual Desert Horticulture Conference
- May 15: AHS Annual Academic Scholarship – Application Deadline
- May 18–21: EWRI 2025 World Environmental & Water Resources Congress
- May 20–21: WRRC 2025 Annual Conference: Shared Borders, Shared Waters: Working Together in Times of Scarcity
- May 21: USGS National Water Availability Assessment Webinar
- May 30: AHS New Transboundary Hydrology and Water Resources Academic Scholarship – Application Deadline
- Jun 1: CAP Award for Student Water Research – Submission Deadline
- Jun 3–5: 2025 UCOWR/NIWR Annual Water Resources Conference
- Jun 6: Sonoran Institute 35th Anniversary Celebration Denver
- Jun 30: International Arid Lands Consortium Scholars Award – Application Deadline
- Jun 30: CitiesWithWater International Photography Competition – Submission Deadline
- Jul 8–11: One Water Summit 2025
- Aug 6–8: Alliance for Water Efficiency 3rd Annual Water Efficiency & Conservation Symposium
- Sep 4: WRRC Water Webinar: Sonoran Institute – Save the Date!
- Sep 14–17: AWWA 2025 Water Infrastructure Conference
- Sep 23–24: NGWA Managed Aquifer Recharge Conference: Unleashing Resiliency, Protecting Groundwater Quality
- Oct 1–3: AHS 2025 Symposium
- Oct 7–9: AWWA WaterSmart Innovations Conference
- Nov 9–12: AWSISA Africa & Global South Water and Sanitation Dialogue: Towards Sustainable Water and Sanitation Services
- Nov 10–12: AWRA 2025 Annual Water Resources Conference
- Nov 13–14: U of A Annual AgTech Field Day and Conference – The Desert Difference: Farmtech Connect – Save the Date!
- Jan 11–17, 2026: ASABE Global Symposium on Sustainable Microirrigation Advances: Drop to Boom