Load and discovery. Weekend and evening hours are when a household runs its full water load at once, showers, laundry, dishwasher, guests, and a marginal lateral or system that copes all week declares itself under the peak. The backup is not scheduled; the load is. Local operators' own accounts of after-hours sewer calls in the borough follow exactly that shape. The practical defenses are the calm-season ones: a camera on a lateral that has slowed twice, a septic pumping rhythm kept on schedule, and the water backup endorsement question answered before the holiday weekend, not during it.
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