water contamination

Water utilities in at least twelve states reported cyber incidents to the FBI, with some attacks degrading operations. Contamination of municipal water requires three conditions: low or negative pressure in the pipes, a physical gap such as a leak, and contaminants outside the system. Power outages stop pumps, which drops pressure and can allow contaminants to enter from surrounding soil and groundwater. The EPA estimates approximately one deliberate contamination attack nationally every one to ten years. Stored water in household containers and tanks can buffer a household during a supply interruption. (NBC News, The New York Times*, PMC article on public health impacts of deteriorating distribution systems, EPA, Power Resilience: Guide for Water and Wastewater Utilities, U.S. Environmental Protection Agency, Resilience Analytics for Interdependent Power and Water Distribution Systems*)

Water and wastewater utilities in at least seven states reported cyber incidents to the FBI and EPA, with some malicious activity degrading water operations. The tally of states reporting possible attacks rose to at least twelve. (NBC News, The New York Times*)

The EPA defines contamination of finished water as deliberate introduction of a contaminant into finished water storage or the distribution system with intent to poison consumers or contaminate infrastructure. The agency's conservative estimate is approximately one attack among all public water systems nationally every one to ten years. (U.S. Environmental Protection Agency)

Contaminant intrusion into a drinking water distribution system requires three conditions: low or negative pressure, physical gaps such as leaks or breaks, and contaminants outside the system. All three must be present. (PMC article on public health impacts of deteriorating distribution systems)

Power outages disrupt drinking water utilities by stopping pumps. This leads to water shortages and pressure loss in the distribution system. Pressure loss allows contaminants to enter the system from surrounding soil and groundwater. Inoperable pumps make firefighting difficult and can cause local health care facilities and restaurants to close. (EPA, Power Resilience: Guide for Water and Wastewater Utilities)

A 2022 study modeled how power outages propagate to water shortages by interrupting pumping stations and reducing downstream water pressure. The study found that water shortage from a power outage could be temporarily buffered by stored water in tanks. (Resilience Analytics for Interdependent Power and Water Distribution Systems)

• Fill two clean 2-litre bottles with tap water, cap them, and write today's date on each with a marker. (EPA, Power Resilience: Guide for Water and Wastewater Utilities)
• Write down your water utility's emergency phone number and tape it inside a kitchen cabinet. (EPA, Power Resilience: Guide for Water and Wastewater Utilities)
• Walk the outside of your house and check for dripping outdoor faucets or wet spots in the yard that might indicate a leak. (PMC article on public health impacts of deteriorating distribution systems)
• Find your home's main water shutoff valve and confirm you can turn it by hand. (EPA, Power Resilience: Guide for Water and Wastewater Utilities*, PMC article on public health impacts of deteriorating distribution systems)

Hackers targeted municipal water systems in 7 states this week, FBI says — NBC News, retrieved 2026-08-13

Water Supply Warnings — The New York Times, retrieved 2026-08-13

Baseline Information on Malevolent Acts for Community Water Systems — U.S. Environmental Protection Agency, retrieved 2026-08-13

Public Health Impacts of Deteriorating Distribution Systems — PMC, retrieved 2026-08-13

Power Resilience: Guide for Water and Wastewater Utilities — EPA, retrieved 2026-08-13

Resilience Analytics for Interdependent Power and Water Distribution Systems — OSTI, retrieved 2026-08-13