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Water Hardness in Cottage Grove, OR

Oregon · 1 zip codes · 10 matched water systems

20 PPM
1.2 GPG
Soft
0Soft60120180300+
Verified — Annual Water Quality Report

City avg (weighted): 20 PPM

Dataset updated March 9, 202610 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading
Eugene Water & Electric Board
OR4100287
Water source: surface water
Serves: 176,000
USGS environmental estimate: 112 PPM
Source context

How this city reading is built

This city reading is a weighted rollup across 10 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis
3 verified treated-water sources
10 matched systems total for this city; treated-water reports are prioritized when available.
Water source profile
Primarily surface water
Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.
Data recency
March 9, 2026
Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems in Cottage Grove

These systems are matched to Cottage Grove, OR. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.

10 water systems
PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.
Eugene Water & Electric Board
OR4100287
Soft
20 PPMsurface water176,000 servedVerified — Annual Water Quality Report
Source water: 112 PPM
Springfield Utility Board
OR4100837
Soft
20 PPMsurface water62,100 servedVerified — Annual Water Quality Report
Source water: 24 PPM
Cottage Grove, City Of
OR4100236
Soft
20 PPMsurface water10,879 servedVerified — Annual Water Quality Report
Source water: 112 PPM
Lamontai Improvement Wtr Dist
OR4100238
Hard
195 PPMgroundwater255 servedEstimated — Nearby Data
Riverstone Mobile Home Park
OR4100240
Hard
195 PPMgroundwater168 servedEstimated — Nearby Data
Showing the first 5 systems. Expand to review all matched systems.

Zip Codes in Cottage Grove, OR

9742420

What This Means For You

Recommendations are based on the displayed hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Your Water Is Soft

Your water hardness is in the soft range. You likely don't need a water softener. Enjoy your naturally soft water!

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Cottage Grove, OR.

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Frequently Asked Questions

How hard is the water in Cottage Grove, OR?

The citywide weighted average water hardness in Cottage Grove, OR is 20 PPM (1.2 GPG), classified as soft. This is based on 10 matched water systems. The gauge highlights Eugene Water & Electric Board, a verified treated-water system, because individual systems can differ from the citywide average.

Do I need a water softener in Cottage Grove, OR?

At 20 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Cottage Grove, OR safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve Cottage Grove, OR?

Cottage Grove, Oregon is served by 10 matched water systems across 1 zip code.

Learn More About Your Water

Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

10 min read

How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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