# Security Breach at Colorado Water Utilities Exposes Critical Vulnerabilities

*Published September 23, 2026*
*Source: [https://www.sans.org/newsletters/newsbites/xxviii-70](https://www.sans.org/newsletters/newsbites/xxviii-70)*

## Executive Summary

Cyber attackers infiltrated Colorado water utilities in August, altering systems and disabling alarms without affecting water quality. This breach highlights vulnerabilities in safety processes, emphasizing the need for robust security measures.

## Article

In August, cyber attackers breached small water utility systems in Colorado, manipulating not only the control systems but also the safety processes. This incident, unlike others, did not impact water quality or public safety, yet it raises significant concerns. The attackers altered pumping cycles and equipment settings, and critically, they disabled alarms. Alarms serve as essential safeguards, alerting operators to abnormal process behaviors. The breach underscores the need for heightened security measures to protect these safeguards, which are as vital as the systems they monitor. Ensuring the integrity of alarm systems is crucial to maintaining operational safety and preventing potential hazards.