Environmental Rules in Westerville, OH (2026)
4 verified environmental rules for Westerville, Ohio, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Westerville operates an MS4 stormwater program under Ohio EPA NPDES permit, regulated by Codified Ordinance Chapter 933. New development over 1 acre requires a SWPPP and post-construction BMPs. Illicit discharges to storm drains are prohibited; only rainwater allowed.
Environmental: Stormwater
Heavy RestrictionsErosion Control
Westerville requires erosion and sediment control on construction sites disturbing over 5,000 square feet under Codified Ordinance 933.09, aligned with the Ohio Rainwater and Land Development manual. Silt fence, inlet protection, and stabilized construction entrances are required until final stabilization.
Environmental: Erosion Control
Heavy RestrictionsFlood Zones
Westerville is a FEMA NFIP participant community (CID 390174). Alum Creek runs through the west side of the city, creating Zone AE special flood hazard areas. Development in the floodplain requires a floodplain permit under Codified Ordinance 1315, 1-foot freeboard above base flood elevation, and no-rise certification in the floodway.
Environmental: Flood Zones
Heavy RestrictionsGrading & Drainage
Westerville requires a grading permit for earthwork over 50 cubic yards or changes affecting drainage patterns under Codified Ordinance 933.08. Graded lots must direct runoff away from structures and neighboring properties. Sump pump discharge to sanitary sewer is prohibited.
Environmental: Grading Drainage
Some RestrictionsLooking for Franklin County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Westerville city rules.
Environmental Rules in Franklin County →