About 67% of housing units in Philadelphia, PA (486,136 of 730,630) were built before 1960, the era of galvanized steel supply lines and cast iron drains.
The median owner-occupied home in Philadelphia, PA was built in 1949 (Census ACS 5-year), showcasing vintage plumbing infrastructure that requires expert handling during sewer overflows.
Philadelphia, PA has 730,630 housing units on record in the Census ACS 5-year estimates, many of which share aged drainage mains across historic neighborhoods.
A frequent pattern echoed in public discussions is that the city sewer is overwhelmed by storm water when too much ground water floods the sewer with more water than it can handle, while some properties remain on an old private sewer because the old homeowner did not want to re-pipe into the new public sewer under the street.
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