Water Hardness in Great Falls, MT
Montana · 3 zip codes · 18 matched water systems
City avg (weighted): 120 PPM
Dataset updated March 9, 202618 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Great Falls, MT Water Hard or Soft?
The displayed hardness for Great Falls, MT is 120 PPM (7 GPG) from Great Falls City Of, classified as moderately hard. The citywide weighted average is 120 PPM.
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.
How this city reading is built
This city reading is a weighted rollup across 18 matched water systems and 3 ZIP codes. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.
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 Great Falls
These systems are matched to Great Falls, MT. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Great Falls City Of MT0000525 | surface water | 120 PPM Moderately HardUSGS estimate: 232 PPM | |
| Malmstrom Air Force Base MT0000515 | surface water | 120 PPM Moderately HardUSGS estimate: 232 PPM | |
| Sun Prairie Village County MT0000521 | groundwater | 120 PPM Moderately HardUSGS estimate: 617 PPM | |
| Prairie Water Company MT0003539 | surface water | 120 PPM Moderately HardUSGS estimate: 617 PPM | |
| Countryside Village Mhp Grt Fls MT0004830 | surface water | 120 PPM Moderately HardUSGS estimate: 232 PPM |
Zip Codes in Great Falls, MT
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.
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 Great Falls, MT.
Frequently Asked Questions
How hard is the water in Great Falls, MT?
The citywide weighted average water hardness in Great Falls, MT is 120 PPM (7 GPG), classified as moderately hard. This is based on 18 matched water systems.
Do I need a water softener in Great Falls, MT?
With a citywide average hardness of 120 PPM, a water softener is worth considering for homes in Great Falls. Confirm your tap reading before sizing equipment.
Is hard water in Great Falls, MT 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 Great Falls, MT?
Great Falls, Montana is served by 18 matched water systems across 3 zip codes.
Learn More About Your Water
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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10 min readPPM to GPG Converter + Water Hardness Scale Explained
Convert between PPM and GPG instantly. Understand the USGS water hardness scale and what your numbers mean for your home.
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