A major regional water and wastewater authority serving over 800,000 customers developed a cybersecurity plan aligned with DHS guidance to strengthen its OT environment. The organization aimed to reduce its attack surface by restricting all command-and-control operations to within the plant network and adopting a segmented architecture that eliminated remote access into OT systems. This defense‑in‑depth approach focused on creating a more secure, isolated operational environment to prevent external threats from reaching critical infrastructure while maintaining safe and reliable plant operations.

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