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Water Hardness in Side Lake, MN

Minnesota · 1 zip codes · 2 matched water systems

40 PPM
2.3 GPG
Soft
0Soft60120180300+
Verified - Annual Water Quality Report

City avg (weighted): 40 PPM

Dataset updated March 9, 20262 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology

System used for this reading
Duluth
MN1690011
Water source: surface water
Serves: 86,859
USGS environmental estimate: 76 PPM
City report

Is Side Lake, MN Water Hard or Soft?

The displayed hardness for Side Lake, MN is 40 PPM (2.3 GPG) from Duluth, classified as soft. The citywide weighted average is 40 PPM.

Displayed reading
40 PPM
Soft
Local coverage
1 ZIP
2 matched water systems
Source label
Annual Water Quality Report
Verified - Annual Water Quality Report

Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.

View matched systemMethodologyData sourcesSearch by ZIP code
Source context

How this city reading is built

This city reading is a weighted rollup across 2 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.

Source basis
2 verified treated-water sources
2 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 Side Lake

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

2 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.
Duluth
MN1690011
Soft
40 PPMsurface water86,859 servedVerified - Annual Water Quality Report
Source water: 76 PPM
Hibbing
MN1690022
Soft
40 PPMgroundwater16,028 servedVerified - Annual Water Quality Report
Source water: 196 PPM

Zip Codes in Side Lake, MN

5578140

What This Means For You

Use this city reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

MethodologyData sourcesHow to test your 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 Side Lake, MN.

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Frequently Asked Questions

How hard is the water in Side Lake, MN?

The citywide weighted average water hardness in Side Lake, MN is 40 PPM (2.3 GPG), classified as soft. This is based on 2 matched water systems.

Do I need a water softener in Side Lake, MN?

At 40 PPM, the citywide average is relatively soft. A water softener is generally not necessary.

Is hard water in Side Lake, MN 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 Side Lake, MN?

Side Lake, Minnesota is served by 2 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.

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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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