Oak Grove, OR water hardness

Tap water hardness
23mg/L
1.3gpg
Soft

Reported by Lake Oswego Municipal Water · April 2025

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

Oak Grove water measures 23 mg/L (1.3 gpg) of hardness, soft by USGS standards. The number comes from Lake Oswego Municipal Water, dated April 2025.

Oak Grove on the hardness scale, with nearby cities
060120180240300360+OR typical 24Jennings Lodge: 23 mg/LJennings Lodge 23Gladstone: 23 mg/LGladstone 23West Linn: 23 mg/LWest Linn 23Oregon City: 23 mg/LOregon City 23Garden Home-Whitford: 23 mg/LGarden Home-Whitford 23Happy Valley: 24 mg/LHappy Valley 24Lake Oswego: 26 mg/LLake Oswego 26Oatfield: 56 mg/LOatfield 56Tualatin: 77 mg/LTualatin 77Milwaukie: 120 mg/LMilwaukie 120Oak Grove 23mg/L as calcium carbonate060120180240300360+OR 24Jennings Lodge: 23 mg/LJennings L. 23Gladstone: 23 mg/LGladstone 23West Linn: 23 mg/LWest Linn 23Lake Oswego: 26 mg/LLake Oswego 26Oatfield: 56 mg/LOatfield 56Milwaukie: 120 mg/LMilwaukie 12023 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Oak Grove sits close to the typical Oregon figure of 24 mg/L. None of the 10 nearest cities we track has softer water. The range nearby runs from 23 mg/L in Jennings Lodge to 120 in Milwaukie.

What 23 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 23 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 Oak Grove's water system

Lake Oswego Municipal Water · PWSID OR4100457

No health-based violations since 2016

Serves about 40,000 people from surface water.

Health-based
0
Monitoring or reporting
3
Open now
0

TapWaterData ties Oak Grove to this system. EPA's service-area records do not name Oak Grove, so check the utility printed on your water bill.

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 Oak Grove water hard?

No. It measures about 23 mg/L (1.3 grains per gallon), which the USGS classes as soft.

What is the water hardness in Oak Grove in grains per gallon?

About 1.3 gpg. One grain per gallon equals 17.1 mg/L, so 23 mg/L divided by 17.1 gives 1.3.

Has the Oak Grove water system had EPA violations?

EPA records show no health-based violations for Lake Oswego Municipal Water since 2016. There were also 3 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, April 21, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.