Outhouse over the Schuylkill near Pottstown
McConnell Germ-Proof Filters ad
Standard Philadelphia (B) Hydrant
Jar of raw sewage before treatment, 2000
Northeast Sewage Plant opening, 1951
Allegheny Avenue Sewer at Pier 126, 1918
Water Before and After Roxborough
Upper Roxborough Filter Bed Construction, 1902