Where does the water in 65591 come from?

Water for zip code 65591 in Montreal, Missouri is provided by 1 water system. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 65591

Q: Is the water hard in Montreal, MO (65591)?

The average water hardness in 65591 is 304 PPM (17.8 GPG), which is classified as very hard. A water softener is strongly recommended. Very hard water can significantly reduce appliance lifespan.

Q: Do I need a water softener in 65591?

With hardness of 304 PPM, a water softener is recommended for homes in 65591. Hard water can cause scale buildup in pipes and appliances, spotty dishes, and dry skin.

Montreal, Missouri · Camden County

304 PPM

17.8 GPG

Very Hard

0Soft60120180300+

Estimated — County Avg

Dataset updated March 9, 2026Matched to 1 water systemTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 1 matched water system. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis

1 estimated source

This ZIP reading needs local confirmation before equipment sizing or purchase decisions.

Water source profile

Primarily groundwater

Groundwater commonly picks up calcium and magnesium after contact with rock and soil. 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 65591

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.

1 water system

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.

Water System	Source	Hardness	Pop. Served	Data Source
Camden County Pwsd # 5 MO3302557	groundwater	304 PPM Very Hard	1,735	Estimated — County Avg

Camden County Pwsd # 5

MO3302557

Very Hard

304 PPMgroundwater1,735 servedEstimated — County Avg

Nearby Zip Codes

65052304 65017120 65567301 65020304 65065301 65047120 65463209 65083120 65556258 65079304 65049304 65452256

What This Means For You

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

Very Hard Water - Treatment Strongly Recommended

Your water is very hard. Without treatment, you can expect significant scale buildup in pipes and appliances, higher energy bills from reduced water heater efficiency, and persistent issues with skin and hair dryness.

Recommended Products

Salt-Based Water Softener

Our PickAFWFilters Fleck 5600SXT 48K Also GreatWhirlpool WHES40E 40K Also GreatAFWFilters 64K Grain Also GreatAFWFilters Iron Pro 2 64K Also GreatSpringWell Filter + Softener Combo

Water Hardness Test Kit

Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)

Whole-House Water Filter

Our PickiSpring WGB32B 3-Stage

Water Softener Salt

Our PickMorton Clean & Protect Also GreatDiamond Crystal Bright & Soft

Shower Head Filter

Our PickWeddell Duo Also GreatAquaBliss SF100 Also GreatSprite Pure 7-Setting Also GreatAqua Earth 20-Stage

Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | How 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 Montreal, MO (65591).

Submit Your Data

Frequently Asked Questions

Is the water hard in Montreal, MO (65591)?

Our estimate for 65591 is 304 PPM (17.8 GPG), but it is based on nearby, county, or state-level data rather than a direct treated tap-water report for this exact location. Confirm with your utility or a home test.

Do I need a water softener in 65591?

Do not size a softener from this estimate alone. Confirm the actual tap-water hardness before choosing treatment equipment.

Is hard water in 65591 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 65591?

Zip code 65591 in Montreal, Missouri is served by 1 water system.