Gahanna City

• Gahanna draws no water of its own at all — 100% of its supply is purchased finished from Columbus, and all of its sewage goes back to Columbus for treatment.
• When Columbus raised Gahanna's wholesale water rate 18% for 2026, the city absorbed part of the hit and passed through a 10% increase instead.
• A Gahanna household using 4,000 gallons a month saw its combined water, sewer and stormwater bill rise $7.46 in 2026.

• 1849Gahanna was founded along Big Walnut Creek, the waterway that still runs through the city.
• 2026Columbus raised Gahanna's wholesale water rate 18% and its sewage treatment rate 8%; Gahanna absorbed part and passed through an overall 6.14% increase.
• 2026Extensive rainfall on and around Saturday, August 22 flooded parts of Gahanna, damaging homes; Governor DeWine sought FEMA assistance for recovery.

How it is treated

Gahanna operates no plant and no wells: it buys 100% finished water from Columbus, which runs three treatment plants and describes a 'multi-barrier approach.' Per SDWIS the ultimate sources are the Scioto River (Griggs and O'Shaughnessy) and Hoover Reservoir on Big Walnut Creek.

Water pressure

Not published; Gahanna's Public Utilities page gives no psi or pressure-zone figures, and delivery pressure is set by the Columbus system feeding it.

$11.74 per 1,000 gallons

Typical household bill about $47 a month for water.

2026 residential water: $10.62/1,000 gal operations plus $1.12 capital. Sanitary sewer adds $12.49/1,000 gal. Overall utility increase 6.14%.

EPA compliance record

Lead at the tap: 90th-percentile result 0.5 ppb in 2024 (action level 15 ppb).

EPA record: no health-based violations since 2015.

1 violation of any kind logged since 2020, 1 of them paperwork (monitoring, reporting, public notice or consumer report).

EPA compliance record · Columbus Public Water System (treats the water)

Lead at the tap: 90th-percentile result 1.2 ppb in 2023 (action level 15 ppb).

EPA health-based violations since 2015:

• 2016Nitrate · exceeded a maximum contaminant level · measured 10.5 MG/L (limit 10 MG/L) · returned to compliance

Gahanna has no source of its own — 100% of supply is purchased finished water from Columbus, so both reliability and cost track the Columbus Scioto River/Hoover Reservoir system. In August 2026 extensive rainfall flooded parts of the city, prompting a state request for federal disaster aid.

Sanitary

Gahanna owns and maintains its own sanitary collection system and runs a CMOM program, but sends all wastewater to Columbus for treatment at the Jackson Pike and Southerly plants, which serve Columbus plus about 25 contracting suburban communities. 2026 rate: $12.49/1,000 gal.

Storm

Separate storm sewer infrastructure owned by the city and managed by its Engineering Department; stormwater is billed within the utility rates. Extensive August 2026 rainfall caused widespread property damage.

Compiled from the utility's own reports and public records, then independently re-checked against primary sources.