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Lake Forest details response after late‑October water main breaks, lift boil order
Summary
City staff described two cast‑iron transmission main breaks, a mandatory boil order, and next steps including condition assessments, electrical resiliency work with ComEd and possible vibroacoustic testing.
City of Lake Forest officials on Oct. 20 detailed response steps after two water‑main failures and a subsequent mandatory boil‑water order that affected parts of the city the prior week.
City Manager Jason Wietjoff said the city has launched an after‑action review to identify what went well and what the city will change to reduce the risk of recurrence. “We are going through a fairly extensive after action review to really ask the questions of what went right, what could have gone better, what lessons, can we learn from this experience,” Wietjoff said.
Public Works Director Michael Thomas described the sequence: crews had taken the water tower offline for scheduled work and were relying on interconnections with neighboring Lake Bluff when a cast‑iron transmission main fractured early on Friday, causing pressure drops below the 20 psi regulatory threshold that triggered Illinois EPA guidance requiring a boil order and 20 bacteriological samples. “Anytime we drop below 20 psi in our…
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