Water in Westerville
The 2020 census counted 39,190 people in Westerville, in Franklin County and Delaware County. It is about 12 miles from downtown Columbus.
Drinking water in Westerville comes from City of Westerville Water Division (own 7.5 MGD plant); Columbus serves 'various parts' of Westerville per Columbus contract list. Plant softens with lime & caustic soda; city states water softened to ~125 mg/L (~7 gpg)
City of Westerville Water Division (own 7.5 MGD plant); Columbus serves 'various parts' of Westerville per Columbus contract list publishes a hardness figure for this supply: ~7 gpg (~125 mg/L).
ZIP codes on file for Westerville are 43081, 43082, 43086.
Reverse osmosis installation here
Reverse osmosis in Westerville belongs at the kitchen sink, for cooking and drinking. It is not a whole-house softener. A unit should be certified for the reductions you actually want.
Nearby cities
Worthington is 5.5 miles from Westerville, in Franklin County. Water there is City of Columbus water (Columbus Water & Power) - listed contract community. Published hardness: 5.7-7.3 gpg (98-125 mg/L) 2025 annual avg by plant; system avg 115 mg/L.
Lewis Center is 6.6 miles from Westerville, in Delaware County. We have not confirmed Lewis Center's public supplier, so that page does not state one.
New Albany is 6.9 miles from Westerville, in Franklin County. Water there is City of Columbus water (Columbus Water & Power) - listed contract community. Published hardness: 5.7-7.3 gpg (98-125 mg/L) 2025 annual avg by plant; system avg 115 mg/L.
Powell is 8.9 miles from Westerville, in Delaware County. Water there is Del-Co Water Company, Inc. (per City of Powell utilities page). Published hardness: 7-8 gpg (120-140 mg/L) per Del-Co.
More in Westerville
Nearby
Questions people ask
Who supplies drinking water in Westerville?
City of Westerville Water Division (own 7.5 MGD plant); Columbus serves 'various parts' of Westerville per Columbus contract list. City of Westerville Water Division (own 7.5 MGD plant); Columbus serves 'various parts' of Westerville per Columbus contract list publishes a hardness figure for this supply: ~7 gpg (~125 mg/L).
Is the water in Westerville hard?
~7 gpg (~125 mg/L). That is the published figure, in the units the utility used. Spots on glass and scale in a water heater are the household signs. The test confirms the number at the address.
How is Westerville different from Worthington?
Worthington is 5.5 miles from Westerville, in Franklin County. Water there is City of Columbus water (Columbus Water & Power) - listed contract community. Published hardness: 5.7-7.3 gpg (98-125 mg/L) 2025 annual avg by plant; system avg 115 mg/L.
Which ZIP codes does the Westerville page cover?
43081, 43082, 43086. Those come from a named place source, not a guessed centroid. Houses just outside the city limits may be on a different supplier.