How hard is the water in Roseburg, OR?

Tap water hardness
66mg/L
3.8gpg
Moderately hardCounty estimate

County estimate from 923 water samples in Douglas County · July 2026

OR typical
24 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
County estimate

Water samples from around Roseburg put hardness at about 66 mg/L (3.8 gpg), which would be moderately hard on the USGS scale. Treat this as a rough guide: it is the median of 923 samples taken across Douglas County, mostly wells and streams, not a test of Roseburg's treated tap water. One more reason for caution: EPA lists Roseburg's water system as using surface water, which is often softer than the wells behind the county figure.

Roseburg on the hardness scale, with nearby cities
060120180240300360+OR typical 24Springfield: 18 mg/LSpringfield 18Eugene: 19 mg/LEugene 19River Road: 19 mg/LRiver Road 19Santa Clara: 19 mg/LSanta Clara 19Lebanon: 25 mg/LLebanon 25Albany: 25 mg/LAlbany 25Corvallis: 27 mg/LCorvallis 27Ashland: 31 mg/LAshland 31Deschutes River Woods: 32 mg/LDeschutes River Woods 32Medford: 145 mg/LMedford 145Roseburg 66mg/L as calcium carbonate060120180240300360+OR 24Springfield: 18 mg/LSpringfield 18Eugene: 19 mg/LEugene 19River Road: 19 mg/LRiver Road 19Santa Clara: 19 mg/LSanta Clara 19Ashland: 31 mg/LAshland 31Medford: 145 mg/LMedford 14566 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Roseburg sits 42 mg/L above the typical Oregon figure of 24. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 18 mg/L in Springfield to 145 in Medford.

What 66 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 Roseburg

3 people × 75 gallons a day × 3.8 gpg = 862 grains a day. A 24,000-grain unit regenerates about every 27 days.

Size it for your household

EPA record for Roseburg's water system

Roseburg, City of · PWSID OR4100720

No health-based violations since 2016

Serves about 28,800 people from surface water.

Health-based
0
Monitoring or reporting
4
Open now
1

EPA lists this system as serving Roseburg.

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 Roseburg water hard?

Somewhat. It measures about 66 mg/L (3.8 grains per gallon), which the USGS classes as moderately hard.

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

About 3.8 gpg. One grain per gallon equals 17.1 mg/L, so 66 mg/L divided by 17.1 gives 3.8.

What size water softener do I need in Roseburg?

For 3 people using 75 gallons each per day, 3.8 gpg works out to about 862 grains a day. A 24,000-grain softener covers that with a regeneration about every 27 days.

Has the Roseburg water system had EPA violations?

EPA records show no health-based violations for Roseburg, City of since 2016. There were also 4 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 53 cities in Oregon

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.