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(TLP:CLEAR) H2OSecCon is under two weeks away. Don’t miss your chance to be part of the conversations shaping security and resilience across the water sector. From evolving cyber threats to operational resilience and cross-sector coordination, the challenges facing utilities today require collaboration, shared insight, and action. If your utility isn’t in the room, you could miss critical perspectives, lessons learned, and connections that help strengthen preparedness. Join sector leaders and security professionals on June 2 for a full day of virtual programming focused on keeping the water and wastewater sector informed, connected, and resilient. Register now to secure your spot.

Incident Report – Explosive Device Found, Detonated at Dam Water Reservoir

(TLP:GREEN) Last week, a “grenade-type” explosive device was safely detonated after being found in an Alabama reservoir that supplies drinking water to a large metropolitan area. Utility personnel quickly notified authorities and successfully mitigated the potential threat, underscoring the importance of prompt suspicious activity reporting.

General Security and Resilience

(TLP:AMBER+STRICT) Situation Report: Heightened Threat Environment – Potential Retaliation by Iranian Threat Actors Following U.S. Strikes on Iran (Updated May 21, 2026)

Tip of the Week – May 21, 2026

(TLP:GREEN) Incident Report – Explosive Device Found, Detonated at Dam Water Reservoir

(TLP:GREEN) Gate 15 Threat Awareness & Resilience Guidance Report: Hostile Event Attack Cycle (14 May 2026)

(TLP:CLEAR) U.S. Government Releases 2026 Counterterrorism Strategy

(TLP:AMBER) NCTC Counterterrorism Weekly: May 14 – 20, 2026

(TLP:CLEAR) Supplemental General Security & Resilience Highlights – May 21, 2026

(TLP:GREEN) May 20, 2026 WaterISAC Natural Disaster Threat Briefing

Cybersecurity

(TLP:AMBER) DHS Office of Intelligence and Analysis Reports (May 21, 2026)

(TLP:CLEAR) Weekly Vulnerabilities to Prioritize – May 21, 2026

(TLP:GREEN) PEAR Ransomware Claims U.S. Drinking Water Utility as Victim

(TLP:CLEAR) Poland Warns of Escalating Cyber Threats to Water Utilities and ICS Operations

(TLP:CLEAR) Verizon’s 2026 Data Breach Investigations Report (DBIR)

(TLP:CLEAR) CISA ICS Advisories, Additional Alerts, Updates, and Bulletins – May 21, 2026

(TLP:CLEAR) Vulnerability Notification – Critical Zero-Day Vulnerability in Microsoft Exchange Under Active Exploitation, CVE-2026-42897

(TLP:CLEAR) Vulnerability Notification – Critical Vulnerability Affecting Cisco Catalyst SD-WAN, CVE-2026-20182

WaterISAC Events

Water Sector Cyber Resilience Briefing – CISA’s No-Cost Cyber Vulnerability Scanning for Water Utilities, Tool Walkthrough and Member Testimonial

H2OSecCon- Virtual Conference

WaterISAC Special Webinar – FBI Physical Security Threat Briefing

WaterISAC Informational Webinar

H2OEx- Camden, NJ

H2OEx- Chicago, IL