Where does the water in 72170 come from?

Water for zip code 72170 in Ulm, Arkansas 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 72170

Ulm, Arkansas · Prairie County

404 PPM

23.6 GPG

Very Hard

0Soft60120180300+

High Confidence - USGS Monitoring

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 USGS-backed source

1 matched system total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.

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 72170

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
Ulm Waterworks AR0000451	groundwater	404 PPM Very Hard	216	High Confidence - USGS Monitoring

Ulm Waterworks

AR0000451

Very Hard

404 PPMgroundwater216 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

7213430 72026404 72160404 72041346 72029104 72038404 72003404 72069104 72140401 72064346 7207267 72073403

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.

Methodology Data sources 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 Ulm, AR (72170).

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Frequently Asked Questions

Is the water hard in Ulm, AR (72170)?

The average water hardness in 72170 is 404 PPM (23.6 GPG), which is classified as very hard.

Do I need a water softener in 72170?

With hardness of 404 PPM, a water softener is recommended for homes in 72170.

Is hard water in 72170 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 72170?

Zip code 72170 in Ulm, Arkansas is served by 1 water system.