Hillsboro, OR water hardness

Tap water hardness
24mg/L
1.4gpg
Soft

Reported by Tualatin Valley Water District · September 2025

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

The water in Hillsboro carries roughly 24 mg/L of dissolved calcium and magnesium, or 1.4 grains per gallon. That is soft water. The number comes from Tualatin Valley Water District, dated September 2025.

Hillsboro on the hardness scale, with nearby cities
060120180240300360+OR typical 24West Haven-Sylvan: 21 mg/LWest Haven-Sylvan 21Rockcreek: 23 mg/LRockcreek 23Aloha: 23 mg/LAloha 23Bethany: 23 mg/LBethany 23Cedar Mill: 23 mg/LCedar Mill 23Oak Hills: 35 mg/LOak Hills 35Marlene Village: 35 mg/LMarlene Village 35Cedar Hills: 35 mg/LCedar Hills 35Beaverton: 35 mg/LBeaverton 35West Slope: 35 mg/LWest Slope 35Hillsboro 24mg/L as calcium carbonate060120180240300360+OR 24Rockcreek: 23 mg/LRockcreek 23Aloha: 23 mg/LAloha 23Bethany: 23 mg/LBethany 23Oak Hills: 35 mg/LOak Hills 35Marlene Village: 35 mg/LMarlene Vi. 35Cedar Hills: 35 mg/LCedar Hills 3524 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Hillsboro sits close to the typical Oregon figure of 24 mg/L. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 21 mg/L in West Haven-Sylvan to 35 in Oak Hills.

What 24 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 24 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 Hillsboro's water system

Hillsboro, City of · PWSID OR4101513

No health-based violations since 2016

Serves about 92,632 people from surface water.

Health-based
0
Monitoring or reporting
2
Open now
0

EPA lists Hillsboro, City of as the system serving Hillsboro. The hardness figure above comes from a different system's report, which TapWaterData uses for Hillsboro.

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 Hillsboro water hard?

No. It measures about 24 mg/L (1.4 grains per gallon), which the USGS classes as soft.

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

About 1.4 gpg. One grain per gallon equals 17.1 mg/L, so 24 mg/L divided by 17.1 gives 1.4.

Has the Hillsboro water system had EPA violations?

EPA records show no health-based violations for Hillsboro, City of since 2016. There were also 2 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, September 2, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.