Corvallis, OR water hardness

Tap water hardness
27mg/L
1.6gpg
Soft

Reported by Corvallis, City of · May 2025

OR typical
24 mg/L
EPA health violations since 2016
0
Data
Utility report

Tap water in Corvallis has about 27 mg/L of hardness, which is 1.6 grains per gallon. On the USGS scale that counts as soft. The number comes from Corvallis, City of, dated May 2025.

Corvallis on the hardness scale, with nearby cities
060120180240300360+OR typical 24Salem: 16 mg/LSalem 16Four Corners: 16 mg/LFour Corners 16Hayesville: 16 mg/LHayesville 16Springfield: 18 mg/LSpringfield 18Santa Clara: 19 mg/LSanta Clara 19River Road: 19 mg/LRiver Road 19Eugene: 19 mg/LEugene 19Albany: 25 mg/LAlbany 25Lebanon: 25 mg/LLebanon 25Keizer: 95 mg/LKeizer 95Corvallis 27mg/L as calcium carbonate060120180240300360+OR 24Salem: 16 mg/LSalem 16Four Corners: 16 mg/LFour Corne. 16Hayesville: 16 mg/LHayesville 16Santa Clara: 19 mg/LSanta Clara 19Albany: 25 mg/LAlbany 25Lebanon: 25 mg/LLebanon 2527 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Corvallis sits close to the typical Oregon figure of 24 mg/L. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 16 mg/L in Salem to 95 in Keizer.

What 27 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 27 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Corvallis's water system

Corvallis, City of · PWSID OR4100225

No health-based violations since 2016

Serves about 61,468 people from surface water.

Health-based
0
Monitoring or reporting
23
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 Corvallis water hard?

No. It measures about 27 mg/L (1.6 grains per gallon), which the USGS classes as soft.

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

About 1.6 gpg. One grain per gallon equals 17.1 mg/L, so 27 mg/L divided by 17.1 gives 1.6.

Has the Corvallis water system had EPA violations?

EPA records show no health-based violations for Corvallis, City of since 2016. There were also 23 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 (utility report, May 28, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.