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Water Hardness in 72921

Alma, Arkansas · Crawford County

379 PPM
22.1 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 7 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 7 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
6 USGS-backed sources
7 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
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 72921

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.

7 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.
Van Buren Waterworks
AR0000142
Very Hard
379 PPMsurface water22,725 servedHigh Confidence - USGS Monitoring
Hwy 71 Water District #1 Pwa
AR0000145
Very Hard
379 PPMsurface water6,250 servedHigh Confidence - USGS Monitoring
Alma Waterworks
AR0000144
Very Hard
379 PPMsurface water6,123 servedHigh Confidence - USGS Monitoring
Concord Water & Sewer Pfb Of Crawford Co
AR0000147
Very Hard
379 PPMsurface water3,071 servedEstimated - County Avg
Redhill Water Association
AR0000732
Very Hard
379 PPMsurface water475 servedHigh Confidence - USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

729353797293030729413572956379729523797294735072904307290330729233572933132729463597290130

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 Alma, AR (72921).

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Frequently Asked Questions

Is the water hard in Alma, AR (72921)?

The average water hardness in 72921 is 379 PPM (22.1 GPG), which is classified as very hard.

Do I need a water softener in 72921?

With hardness of 379 PPM, a water softener is recommended for homes in 72921.

Is hard water in 72921 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 72921?

Zip code 72921 in Alma, Arkansas is served by 7 water systems.

Learn More About Your Water

How to Test Water Hardness at Home

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Water Hardness Scale: PPM and GPG Chart

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Well Water Hardness: Why It's Usually Hard & How to Treat It

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