West Slope, OR water hardness

Tap water hardness
35mg/L
2.0gpg
Soft

Reported by Tualatin Valley Water District · September 2025

OR typical
24 mg/L
EPA health violations since 2016
1
Data
Utility report

West Slope water measures 35 mg/L (2.0 gpg) of hardness, soft by USGS standards. The number comes from Tualatin Valley Water District, dated September 2025.

West Slope on the hardness scale, with nearby cities
060120180240300360+OR typical 24West Haven-Sylvan: 21 mg/LWest Haven-Sylvan 21Tigard: 22 mg/LTigard 22Garden Home-Whitford: 23 mg/LGarden Home-Whitford 23Cedar Mill: 23 mg/LCedar Mill 23Aloha: 23 mg/LAloha 23Raleigh Hills: 35 mg/LRaleigh Hills 35Cedar Hills: 35 mg/LCedar Hills 35Beaverton: 35 mg/LBeaverton 35Marlene Village: 35 mg/LMarlene Village 35Oak Hills: 35 mg/LOak Hills 35West Slope 35mg/L as calcium carbonate060120180240300360+OR 24West Haven-Sylvan: 21 mg/LWest Haven. 21Garden Home-Whitford: 23 mg/LGarden Hom. 23Raleigh Hills: 35 mg/LRaleigh Hi. 35Cedar Hills: 35 mg/LCedar Hills 35Beaverton: 35 mg/LBeaverton 35Marlene Village: 35 mg/LMarlene Vi. 3535 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 35 mg/L, West Slope is 11 mg/L above the typical Oregon figure of 24. None of the 10 nearest cities we track has harder water. The range nearby runs from 21 mg/L in West Haven-Sylvan to 35 in Raleigh Hills.

What 35 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 35 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 West Slope's water system

West Slope Water District · PWSID OR4100660

1 health-based violation since 2016

Serves about 11,000 people from surface water.

Health-based
1
Monitoring or reporting
5
Open now
0

EPA lists West Slope Water District as the system serving West Slope. The hardness figure above comes from a different system's report, which TapWaterData uses for West Slope.

20162017201820192020202120222023202420252026Lead and Copper Rule'16'18'20'22'24'26Lead and Copper Rule
Each dot is one health-based violation, placed at the start of its compliance period.
Contaminant or ruleViolationsPeriodStatus
Lead and Copper Rulecorrosion control and lead sampling12018Resolved

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 West Slope water hard?

No. It measures about 35 mg/L (2.0 grains per gallon), which the USGS classes as soft.

What is the water hardness in West Slope in grains per gallon?

About 2.0 gpg. One grain per gallon equals 17.1 mg/L, so 35 mg/L divided by 17.1 gives 2.0.

Has the West Slope water system had EPA violations?

EPA records show 1 health-based violation for West Slope Water District since 2016, involving Lead and Copper Rule. There were also 5 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.