Remarkable Ohio


Below is a complete listing of all Ohio Historical Markers. To find a detailed marker listing including text, photographs, and locations, click on a county below. Our listing is updated by the markers program as new markers are installed and older markers are reported damaged or missing.

4-77 Early Synthetic Soda Ash Plant

Side A: Production of synthetic soda ash began here, in America’s second plant, on November 1, 1900, by Columbia Chemical Company to support Pittsburgh Plate Glass Company (now PPG Industries), marking birth of PPG’s diversified chemical operations. Principal founder John Pitcairn, first works manager Hugh Allen Galt. Plant subsequently added other chemicals. World’s deepest limestone mine (2200 feet beneath surface) established 1944. Soda ash discontinued 1973.
Side B: Same
Sponsors: PPG Industries and The Ohio Historical Society
Address: On Hudson Road (near 361-363) east of Fairfield Road intersection., 
Latitude: 41.0024309
Longitude: -81.6191415