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Water Hardness in 59718

Manhattan, Montana · Gallatin County

105 PPM
6.1 GPG
Slightly Hard
0Soft60120180300+
Verified - Annual Water Quality Report

Dataset updated March 9, 2026Matched to 9 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 9 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
9 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 59718

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.

9 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.
Bozeman City Of
MT0000161
Slightly Hard
100 PPMsurface water56,000 servedVerified - Annual Water Quality Report
Source water: 81 PPM
Belgrade City Of
MT0000136
Slightly Hard
100 PPMgroundwater10,460 servedVerified - Annual Water Quality Report
Source water: 162 PPM
Manhattan Town Of
MT0000285
Hard
227 PPMgroundwater1,800 servedEstimated - Nearby Data
Wylie Creek Estates Subdivision
MT0003961
Hard
227 PPMgroundwater400 servedEstimated - Nearby Data
Ponderosa Mb Home Subd
MT0000548
Hard
227 PPMgroundwater70 servedEstimated - Nearby Data
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

59741105597151005971410559745100597521005971699

What This Means For You

Use this ZIP 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 Manhattan, MT (59718).

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Frequently Asked Questions

Is the water hard in Manhattan, MT (59718)?

The average water hardness in 59718 is 105 PPM (6.1 GPG), which is classified as slightly hard.

Do I need a water softener in 59718?

At 105 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 59718 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 59718?

Zip code 59718 in Manhattan, Montana is served by 9 water systems.

Learn More About Your Water

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Water Hardness Scale: PPM and GPG Chart

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TDS vs Water Hardness: What's the Difference?

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