Montgomery County · OH

Water filtration in Dayton

Dayton runs 8.1 grains per gallon through City of Dayton Department of Water, 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. Lime softened. Dayton is one of the largest lime-softening systems in the country.

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Local water profile

8.1 grains per gallon — hard water, supplied by City of Dayton Department of Water.

Neighborhoods we serve

Oakwood border
Belmont
Huber Heights area

Water profile

Dayton water is 8.1 grains per gallon.

That is classed as hard water. It comes from City of Dayton Department of Water, per the City of Dayton 2025 Water Quality Report.

Hardness: 8.1 grains per gallonHard
Utility: City of Dayton Department of Water
Source: Great Miami Buried Valley Aquifer, a federally designated sole-source aquifer
Treatment: Lime softened. Dayton is one of the largest lime-softening systems in the country.
PFAS: 2025 sampling at the Ottawa plant averaged 8.81 ppt PFOS, above the federal limit that takes effect in 2029, which EPA has proposed letting systems request until 2031 to meet. Reverse osmosis is the treatment that removes it.

Source: City of Dayton 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 8.1 grains, for a four-person household using about 300 gallons a day. Fewer people or a more efficient softener uses less.

8.1

grains per gallon

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

Common questions

How hard is the water in Dayton, OH?

Water in Dayton, OH is 8.1 grains per gallon, which is classed as hard water. It is supplied by City of Dayton Department of Water from great Miami Buried Valley Aquifer, a federally designated sole-source aquifer, per the City of Dayton 2025 Water Quality Report (2025).

Who supplies the water in Dayton, OH?

Dayton is served by City of Dayton Department of Water. The water comes from great Miami Buried Valley Aquifer, a federally designated sole-source aquifer. Lime softened. Dayton is one of the largest lime-softening systems in the country.

Do I need a water softener in Dayton, OH?

At 8.1 grains per gallon, Dayton 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 Dayton do you cover?

All of Dayton, including Oakwood border, Belmont and Huber Heights area. Flat-rate pricing across the whole service area, with no travel charge between neighborhoods.

How much salt will a softener use in Dayton?

At 8.1 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 Dayton, OH water?

2025 sampling at the Ottawa plant averaged 8.81 ppt PFOS, above the federal limit that takes effect in 2029, which EPA has proposed letting systems request until 2031 to meet. Reverse osmosis at the kitchen tap is the treatment that removes PFAS.

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