Water in London
The 2020 census counted 10,279 people in London, in Madison County. It is about 24 miles from downtown Columbus.
Drinking water in London comes from Mid-Ohio Regional Water & Sewer District (London system). Groundwater from a sand & gravel aquifer; lime softening (2025 CCR)
Mid-Ohio Regional Water & Sewer District (London system) does not publish a hardness figure in the report we reviewed. We test hardness on site in London rather than borrow a number from a neighboring utility.
ZIP codes on file for London are 43140.
Reverse osmosis installation here
Reverse osmosis in London 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
Hilliard is 19 miles from London, 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.
Grove City is 20 miles from London, 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.
Upper Arlington is 22 miles from London, 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.
Dublin is 22 miles from London, 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.
More in London
Nearby
Questions people ask
Who supplies drinking water in London?
Mid-Ohio Regional Water & Sewer District (London system). Mid-Ohio Regional Water & Sewer District (London system) does not publish a hardness figure in the report we reviewed. We test hardness on site in London rather than borrow a number from a neighboring utility.
Is the water in London hard?
London does not have a hardness figure we are willing to cite. The supplier's report does not list one. A grains-per-gallon test at the house is the number that matters.
How is London different from Hilliard?
Hilliard is 19 miles from London, 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 London page cover?
43140. Those come from a named place source, not a guessed centroid. Houses just outside the city limits may be on a different supplier.