Divers in Mobile, Alabama, discovered an improvised explosive device placed underwater at the J.B. Converse Reservoir dam earlier this week, marking what authorities describe as an unprecedented threat to the city's drinking water supply.
The diving team was conducting routine maintenance surveys at the reservoir on Tuesday when they found a grenade-like IED submerged near the dam structure. The divers immediately notified authorities, triggering a multi-agency response that included the FBI Bomb Squad, Mobile County Sheriff's Office, Mobile Police Department Explosive Ordinance Detail, Alabama Law Enforcement Agency Bomb Squad, and the Daphne Search and Rescue Team.
The device was safely removed from the reservoir and detonated in a controlled operation. The J.B. Converse Reservoir holds approximately 17 billion gallons of water and is federally designated as critical infrastructure. Built in 1952, the reservoir is protected by surrounding development restrictions across 9,000 acres of land. Authorities notified the Department of Homeland Security following the discovery.
Bud McCrory, director of the Mobile Area Water and Sewer System, called the incident unprecedented and praised the coordinated law enforcement response. "We are fortunate that this device was discovered before it could cause serious damage to our supply or harm to individuals," McCrory said. He noted the utility plans to increase security measures around the dam infrastructure.
No suspects have been identified as of Thursday morning, and authorities have not released information about a potential motive or who may have placed the device.
What the Left Is Saying
Democratic lawmakers and public safety advocates say the incident underscores the need for increased federal investment in protecting water infrastructure from deliberate threats. Senator Maria Cantwell (D-WA), chair of the Senate Commerce Committee, has previously pushed legislation requiring vulnerability assessments for municipal water systems across the country.
Environmental justice groups note that attacks on water infrastructure disproportionately affect low-income communities and communities of color, which are more likely to rely on single-source municipal water supplies. Organizations including Clean Water Action argue that EPA oversight of dam security protocols remains inadequate despite critical infrastructure designations.
"When someone targets a city's water supply, they're attacking every resident equally," said Eric Goldstein, water sector lead for the Environmental Protection Agency's cybersecurity division, speaking at a 2024 infrastructure hearing. "We need mandatory reporting standards and federal resources to help municipalities harden their defenses."
Progressive advocacy groups have called for expanding the Department of Homeland Security's Chemical Facility Anti-Terrorism Standards to explicitly include water treatment facilities as high-priority sites requiring regular security audits.
What the Right Is Saying
Conservative officials and law enforcement leaders are emphasizing the effectiveness of multi-agency coordination in resolving the threat without casualties. House Homeland Security Committee Chairman Mark Green (R-TN) praised the rapid response, stating that local partnerships with federal assets like the FBI Bomb Squad represent the appropriate model for critical infrastructure protection.
"This case demonstrates exactly why we should be empowering state and local law enforcement with federal support, not creating new bureaucratic agencies," Green said in a statement. "The system worked because professionals on the ground had clear protocols."
Private security consultants aligned with conservative think tanks argue that water utilities bear primary responsibility for their own physical security. The Heritage Foundation's Infrastructure Task Force has published research arguing that unfunded federal mandates requiring enhanced security at municipal water systems impose unfair costs on taxpayers without clear evidence of improved outcomes.
Some Republican legislators have expressed concern that expanding federal oversight of water infrastructure could lead to overreach. Representative Ralph Norman (R-SC) voted against the 2024 Water Infrastructure Resiliency Act, arguing it would create "a new layer of Washington bureaucracy" for municipalities already struggling with aging pipes and treatment facilities.
What the Numbers Show
The J.B. Converse Reservoir serves approximately 200,000 residents in the Mobile metropolitan area as their primary drinking water source, according to Mobile Area Water and Sewer System annual reports.
The facility holds roughly 17 billion gallons of water across its reservoir system. The dam was constructed in 1952 with a design life of 50 years, meaning it is operating approximately 24 years past original specifications under ongoing maintenance protocols.
There are approximately 91,000 community water systems serving the United States, according to EPA data. Of these, roughly 14,000 are considered large systems serving more than 3,300 people. Only about 2% of community water systems have completed vulnerability assessments as recommended by federal guidelines, according to a Government Accountability Office report from 2024.
The FBI Bomb Squad responded to 1,338 incidents nationally in fiscal year 2025, including 47 involving potential threats to critical infrastructure facilities, according to data provided at the International Association of Bomb Technicians and Investigators annual conference. This represents a 12% increase in critical infrastructure responses compared to fiscal year 2024.
The Department of Homeland Security has designated water and wastewater systems as part of the Chemical Facility Anti-Terrorism Standards program since 2013, requiring facilities serving populations over 3.3 million to register with the agency. Smaller systems fall under voluntary guidelines only.
The Bottom Line
Authorities continue investigating who placed the device at the Mobile reservoir and why. No arrests have been made, and investigators have not released a timeline for when they expect to identify suspects.
The incident raises questions about security protocols at critical water infrastructure sites nationwide. While large metropolitan water systems like the one serving Mobile typically fall under federal voluntary guidelines for vulnerability assessments, critics argue these standards are insufficient given demonstrated threats.
Water utility officials say they are reviewing and enhancing security measures around the J.B. Converse dam following the discovery. Residents in the Mobile area have not been advised to take any precautions regarding their water supply, as authorities confirmed the device was removed before it could cause contamination or structural damage.
Investigators are asking anyone with information about suspicious activity near the reservoir to contact the FBI Birmingham Field Office or Mobile police.