How hard is the water in Mentor, OH?

Tap water hardness
67mg/L
3.9gpg
Moderately hard

Reported by Aqua Ohio - Mentor · July 2025

OH typical
113 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

The water in Mentor carries roughly 67 mg/L of dissolved calcium and magnesium, or 3.9 grains per gallon. That is moderately hard water. The number comes from Aqua Ohio - Mentor, dated July 2025.

Mentor on the hardness scale, with nearby cities
060120180240300360+OH typical 113Painesville: 90 mg/LPainesville 90Hudson: 104 mg/LHudson 104Cleveland: 111 mg/LCleveland 111Fairview Park: 111 mg/LFairview Park 111Lakewood: 112 mg/LLakewood 112Bainbridge: 117 mg/LBainbridge 117Reminderville: 117 mg/LReminderville 117Aurora: 117 mg/LAurora 117Ashtabula: 117 mg/LAshtabula 117Solon: 210 mg/LSolon 210Mentor 67mg/L as calcium carbonate060120180240300360+OH 113Painesville: 90 mg/LPainesville 90Cleveland: 111 mg/LCleveland 111Bainbridge: 117 mg/LBainbridge 117Reminderville: 117 mg/LRemindervi. 117Aurora: 117 mg/LAurora 117Solon: 210 mg/LSolon 21067 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Mentor sits 46 mg/L below the typical Ohio figure of 113. None of the 10 nearest cities we track has softer water. The range nearby runs from 90 mg/L in Painesville to 210 in Solon.

What 67 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.

What to do about it

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Mentor

3 people × 75 gallons a day × 3.9 gpg = 878 grains a day. A 24,000-grain unit regenerates about every 27 days.

Size it for your household

EPA record for Mentor's water system

Aqua Ohio - Mentor · PWSID OH4301511

No health-based violations since 2016

Serves about 74,500 people from surface water.

Health-based
0
Monitoring or reporting
1
Open now
0

Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.

Questions

Is Mentor water hard?

Somewhat. It measures about 67 mg/L (3.9 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Mentor in grains per gallon?

About 3.9 gpg. One grain per gallon equals 17.1 mg/L, so 67 mg/L divided by 17.1 gives 3.9.

What size water softener do I need in Mentor?

For 3 people using 75 gallons each per day, 3.9 gpg works out to about 878 grains a day. A 24,000-grain softener covers that with a regeneration about every 27 days.

Has the Mentor water system had EPA violations?

EPA records show no health-based violations for Aqua Ohio - Mentor since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 108 cities in Ohio

Hardness data: TapWaterData US Water Hardness (utility report, July 29, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.