Items

Historic resources from our archives - images, maps, documents, and more.

Laboratory Alkalinity test, ca. 1943

Making It Safe to Drink: Water History Video 2

Diagram showing the Philadelphia Water Department's water treatment process

PWD Drinking Water Treatment diagram

Belmont Filters construction 1903

Belmont Filters construction, 1903

Black-and-white photograph showing the completed Upper Roxborough Filter system. Vaulted concrete ceiling with beds of filter sand.

Upper Roxborough Filter Beds Complete, 1903