Passaic, NJ
Roofing in Passaic, NJ: Older Blocks Along the River
Dundee Island Park, the first riverfront park Passaic County built, had its ribbon cut on 28 October 2020, and its island sits entirely inside a floodway. The city around it packs 21,693 homes into about three square miles, and more than half went up in 1939 or earlier. A stain or a sag there is worth a call: dial (973) 791-8220 and ask about a time to see it.

What stands on these blocks
The Census Bureau's 2024 estimate counts 21,693 homes in Passaic, give or take 554. Roughly 12,671 of them, about 58 percent, date from 1939 or before (margin 656). The listed median build year is 1938, though the Bureau flags that figure as 1939 or earlier, so no margin is given.
Rentals dominate: 16,123 of the city's 21,151 occupied homes are rented, against 5,028 owner-occupied. In most of those buildings the owner decides about the roof, and the owner has to hear about a leak first.

Wires, gas and water
Passaic's wires, water and sewer forms
The Passaic City district is on PSE&G's served-in-full list too, for electricity and natural gas. A wire down is a 911 call; the utility's own line is 1-800-436-7734.
The city's construction page lists a Passaic Valley Water Commission inspection referral and a PVSC sewer connection application among its forms. Both concern water and sewer hookups, not roofs. The page itself describes no roofing rule.
Over the border
The river on one side, three towns on the other
Wikipedia puts 3.24 square miles in Passaic and calls the Passaic River its eastern border, with Garfield and Wallington on the far bank. The same article describes a Passaic Park section with large Queen Anne and Tudor homes.
On the other bank: Garfield's page and Wallington's page, with Wood-Ridge's page farther along. If a rear addition or a porch roof holds water, flat roof repair is the job to read.
Jot these down first
Before you call (973) 791-8220, note the street address, where water showed up and the roof's age if known. If you rent, talk to the owner first. Towns: Wallington, Garfield, Passaic, Wood-Ridge.