Hamilton County · OH

Water filtration in Cincinnati

Cincinnati runs 7.4 grains per gallon through Greater Cincinnati Water Works, which puts it in the hard band. Hard, but not extreme. It is enough to leave scale in a water heater over time, which is what shortens its life. Granular activated carbon and UV. No softening — the hardness you get is what the river carries.

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Local water profile

7.4 grains per gallon — hard water, supplied by Greater Cincinnati Water Works.

Neighborhoods we serve

Hyde Park
Oakley
Mt. Lookout
Mt. Adams
Clifton
Pleasant Ridge

Water profile

Cincinnati water is 7.4 grains per gallon.

That is classed as hard water. It comes from Greater Cincinnati Water Works, per the GCWW 2025 Water Quality Report.

Hardness: 7.4 grains per gallonHard
Utility: Greater Cincinnati Water Works
Source: Ohio River, treated at the Richard Miller plant
Treatment: Granular activated carbon and UV. No softening — the hardness you get is what the river carries.
PFAS: About 12% of GCWW customers are on the Bolton plant, where 2025 PFOA and PFOS both tested slightly above the federal limit that takes effect in 2029, which EPA has proposed letting systems request until 2031 to meet. GCWW is evaluating added treatment. Reverse osmosis is the treatment that removes it.

Source: GCWW 2025 Water Quality Report, 2025 reporting year. Hardness bands follow the Water Quality Association scale: soft under 3.5 grains, moderate 3.5 to 7, hard 7 to 10.5, very hard above 10.5.

What that means here

This is hard water. It will not ruin anything overnight, but scale accumulates inside the water heater over years, which is what shortens its life.

bags of salt a year

At 7.4 grains, for a four-person household using about 300 gallons a day. Fewer people or a more efficient softener uses less.

7.4

grains per gallon

Hard on the Water Quality Association scale. Soft is under 3.5, hard starts at 7, very hard above 10.5.

Wyoming, in the same county, runs about 1.4x harder at 10.1 grains. Hardness here is set by which utility serves the address, not by the county line.

Common questions

How hard is the water in Cincinnati, OH?

Water in Cincinnati, OH is 7.4 grains per gallon, which is classed as hard water. It is supplied by Greater Cincinnati Water Works from ohio River, treated at the Richard Miller plant, per the GCWW 2025 Water Quality Report (2025).

Who supplies the water in Cincinnati, OH?

Cincinnati is served by Greater Cincinnati Water Works. The water comes from ohio River, treated at the Richard Miller plant. Granular activated carbon and UV. No softening — the hardness you get is what the river carries.

Do I need a water softener in Cincinnati, OH?

At 7.4 grains per gallon, Cincinnati water is hard. Water above 7 grains per gallon causes scale in water heaters and fixtures and reduces soap lather, which is the point at which most homes benefit from a softener.

What parts of Cincinnati do you cover?

All of Cincinnati, including Hyde Park, Oakley, Mt. Lookout, Mt. Adams, Clifton and Pleasant Ridge. Flat-rate pricing across the whole service area, with no travel charge between neighborhoods.

How much salt will a softener use in Cincinnati?

At 7.4 grains per gallon, a four-person household using roughly 300 gallons a day goes through about 6 forty-pound bags of softener salt a year. Smaller households and higher-efficiency softeners use less.

Is there PFAS in Cincinnati, OH water?

About 12% of GCWW customers are on the Bolton plant, where 2025 PFOA and PFOS both tested slightly above the federal limit that takes effect in 2029, which EPA has proposed letting systems request until 2031 to meet. GCWW is evaluating added treatment. Reverse osmosis at the kitchen tap is the treatment that removes PFAS.

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