Warren County · OH

Kings Mills, OH

Kings Mills runs 8 grains per gallon through Warren County Water & Sewer, 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 at the Franklin Area and Richard Renneker plants.

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Local water profile

8 grains per gallon, hard water, supplied by Warren County Water & Sewer.

Kings Mills neighborhoods we serve

Historic Kings Mills
Kings Island Drive area

Water profile

Kings Mills water is 8 grains per gallon.

That is classed as hard water. It comes from Warren County Water & Sewer, per the Warren County 2025 Water Quality Report.

Hardness: 8 grains per gallonHard
Utility: Warren County Water & Sewer
Source: 24 wells across five wellfields
Treatment: Lime softened at the Franklin Area and Richard Renneker plants.

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

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 Kings Mills, OH?

Water in Kings Mills, OH is 8 grains per gallon, which is classed as hard water. It is supplied by Warren County Water & Sewer from 24 wells across five wellfields, per the Warren County 2025 Water Quality Report (2025).

Who supplies the water in Kings Mills, OH?

Kings Mills is served by Warren County Water & Sewer. The water comes from 24 wells across five wellfields. Lime softened at the Franklin Area and Richard Renneker plants.

Do I need a water softener in Kings Mills, OH?

At 8 grains per gallon, Kings Mills 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 Kings Mills do you cover?

All of Kings Mills, including Historic Kings Mills and Kings Island Drive area. Flat-rate pricing across the whole service area, with no travel charge between neighborhoods.

How much salt will a softener use in Kings Mills?

At 8 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.

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Local coverage

Kings Mills, OH: ZIP Codes We Serve

We install and service water treatment systems across 45034, 45040.

Kings Mills, OH: Local Landmarks

Homes near Carter Park, Kings High School, Kings Stadium, Kings Mills Elementary School, Kings Mills Post Office and Rivers Crossing Community Church all draw the same municipal supply.

Kings Mills, OH: Nearby Streets

Our crews work 3rd Street, Miami Street, King Avenue, Church Street, 1st Street, Kings Mills Road, Riverwalk Drive and Kings Island Drive regularly.

Kings Mills, OH in the Greater Cincinnati area

Kings Mills sits in Warren County, part of the Greater Cincinnati area. Water here is supplied and treated at the county and municipal level, so hardness and treatment vary street to street across the region rather than following one regional average. That is why we test at the property before recommending a system. See every community we serve in Warren County.

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