Gahanna's Cast Iron Belt and Olde Gahanna Clay Core
Gahanna's housing stock concentrates in the 1970s–1990s era, with a smaller 1880s–1920s pocket in Olde Gahanna along Mill Street. This creates two distinct sewer failure patterns. The Olde Gahanna core has century-old clay tile laterals with the usual root-intrusion and joint-separation issues. The Glenmont / Hamilton Farms / Strawberry Farms 1970s–80s belt was built largely with cast iron and early PVC — and the cast iron laterals from that era are now showing interior scale buildup (tuberculation plus mineral deposits), pitting, and corrosion failure at 45–55 years old.
Gahanna sits on the Big Walnut Creek watershed with silt loam soils and moderate clay content. The municipal sanitary main network is relatively young and modern compared to Bexley, but private laterals in the 1970s–80s neighborhoods are entering the failure zone now. Gahanna also maintains an active tree-canopy preservation program, and the 1970s subdivisions feature mature landscaping that makes open-trench replacement disruptive. Hydro jetting is in steady demand because cast iron scale buildup in the Glenmont / Hamilton Farms homes requires periodic descaling to maintain flow.