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Caribou wastewater generator failures, siphon backups prompt FEMA grant application and repair planning
Summary
Board members were told the Grimes generator failed during a heavy runoff event, causing siphon overflow that backed up into a private basement; the district filed a FEMA grant for a full replacement estimated at nearly $500,000 and is exploring permanent fixes.
Trustees heard that a generator at the Grimes wastewater facility failed during a recent power outage, leaving pumps without emergency power during a high‑flow event and causing a siphon overflow that allowed wastewater to back into a home’s basement.
District staff said the Grimes generator has been unreliable despite recent service and weekly exercises; when the unit failed, heavy rain and melt increased flows and the siphon overflowed on River Road. Staff hired a cleaning company to remove wastewater from the affected basement. A check valve was installed afterward, but staff cautioned sewer check valves are not designed to form a 100% seal and can be overtopped when pump stations push strongly against the line.
The failure and repeat backups have drawn regulatory attention; staff said the district may receive an action letter from Augusta DEP. The district submitted a FEMA grant application to replace the aging generator and associated electrical work; staff estimated the all‑in replacement and installation cost at nearly $500,000. Staff also said some repair costs from a November power surge (including a variable‑frequency drive replacement of about $5,000) are being submitted to insurance for reimbursement.
Staff noted other wastewater budget pressures, including an unanticipated wet test and lab fees (described in the meeting as about $5,100) and pump station repair parts. The wastewater division was also recognized at a state trade show for outstanding operations, though several staff members missed the presentation because they were responding to the outage.
Trustees discussed options for a permanent fix to the siphon backup and storage and noted the generator replacement is tied to external funding and regulatory review. No formal vote on capital replacement was recorded at the meeting; staff said they will continue to pursue grant funding and report back to trustees.
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The board was also informed that previous insurance claims for similar backups were denied and that the district will continue to seek mitigation options.
