Water in Johnstown
The 2020 census counted 5,182 people in Johnstown, in Licking County. It is about 21 miles from downtown Columbus.
Drinking water in Johnstown comes from City of Johnstown Service Dept. (own water treatment plant, 395 W. Jersey St.). Groundwater: three wells at Belt Park on Jersey Street next to the plant; aquifer >130 ft deep under ~130 ft of clay, low susceptibility (Ohio EPA source water assessment). No hardness figure in 2025 CCR.
City of Johnstown Service Dept. (own water treatment plant, 395 W. Jersey St.) does not publish a hardness figure in the report we reviewed. We test hardness on site in Johnstown rather than borrow a number from a neighboring utility.
ZIP codes on file for Johnstown are 43031.
Whole house water filtration here
A whole-house filter in Johnstown treats water where it enters the house: sediment and the taste of disinfectant on a public supply, or a first stage ahead of other equipment on a well. It does not soften water. Match the media to the supplier's source, which is described above, instead of a stock carbon tank.
Nearby places
Granville is 11 miles from Johnstown, in Licking County. Water there is Village of Granville Utilities (own water treatment plant).
Sunbury is 12 miles from Johnstown, in Delaware County. Water there is Del-Co Water Company, Inc. (per City of Sunbury Utilities page; city bills sewer only). Published hardness: ~7-8 gpg (120-140 mg/L) Del-Co system figure.
Blacklick is 13 miles from Johnstown, in Franklin County. We have not confirmed Blacklick's public supplier, so that page does not state one.
Grandview Heights is 22 miles from Johnstown, 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 Johnstown
Nearby
Questions people ask
Who supplies drinking water in Johnstown?
City of Johnstown Service Dept. (own water treatment plant, 395 W. Jersey St.). City of Johnstown Service Dept. (own water treatment plant, 395 W. Jersey St.) does not publish a hardness figure in the report we reviewed. We test hardness on site in Johnstown rather than borrow a number from a neighboring utility.
Is the water in Johnstown hard?
Johnstown 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 Johnstown different from Granville?
Granville is 11 miles from Johnstown, in Licking County. Water there is Village of Granville Utilities (own water treatment plant).
Which ZIP codes does the Johnstown page cover?
43031. Those come from a named place source, not a guessed centroid. Houses just outside the city limits may be on a different supplier.