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Water Hardness in 55751

Iron, Minnesota · St. Louis County

40 PPM
2.4 GPG
Soft
0Soft60120180300+
Verified — Annual Water Quality Report

Dataset updated March 9, 2026Matched to 4 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 4 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis
2 verified treated-water sources
4 matched systems total for this ZIP; 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 Serving 55751

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

4 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
Iron Junction
MN1690029
Hard
196 PPMgroundwater87 servedEstimated — Nearby Data
Iron Bowl Mhp
MN1690030
Hard
196 PPMgroundwater44 servedEstimated — Nearby Data

Nearby Zip Codes

557134255758405573840557344055768445571945557464055741455579240557104055765405570840

What This Means For You

Recommendations are based on the displayed ZIP 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 Iron, MN (55751).

Submit Your Data

Frequently Asked Questions

Is the water hard in Iron, MN (55751)?

The average water hardness in 55751 is 40 PPM (2.4 GPG), which is classified as soft.

Do I need a water softener in 55751?

At 40 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 55751 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 55751?

Zip code 55751 in Iron, Minnesota is served by 4 water systems.

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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