Hard water in Warren, OH
County estimate from 1,094 water samples in Trumbull County · July 2026
- OH typical
- 113 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Warren put hardness at about 148 mg/L (8.7 gpg), which would be hard on the USGS scale. Treat this as a rough guide: it is the median of 1,094 samples taken across Trumbull County, mostly wells and streams, not a test of Warren's treated tap water.
Warren sits 35 mg/L above the typical Ohio figure of 113. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 104 mg/L in Hudson to 285 in Alliance.
What 148 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
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
At 148 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 8.7 gpg = 1,946 grains a day. A 24,000-grain unit regenerates about every 12 days.
EPA record for Warren's water system
No health-based violations since 2016
Serves about 99,000 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 3
- Open now
- 1
EPA lists this system as serving Warren.
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 Warren water hard?
Yes. It measures about 148 mg/L (8.7 grains per gallon), which the USGS classes as hard.
What is the water hardness in Warren in grains per gallon?
About 8.7 gpg. One grain per gallon equals 17.1 mg/L, so 148 mg/L divided by 17.1 gives 8.7.
What size water softener do I need in Warren?
For 3 people using 75 gallons each per day, 8.7 gpg works out to about 1,946 grains a day. A 24,000-grain softener covers that with a regeneration about every 12 days.
Has the Warren water system had EPA violations?
EPA records show no health-based violations for Warren County since 2016. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Youngstown177 mg/LHard
- Aurora117 mg/LModerately hard
- Alliance285 mg/LVery hard
- Kent188 mg/LVery hard
- Bainbridge117 mg/LModerately hard
- Reminderville117 mg/LModerately hard
- Hudson104 mg/LModerately hard
- Stow220 mg/LVery hard
- Solon210 mg/LVery hard
- Akron116 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.