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Water Hardness in 66712

Arma, Kansas · Crawford County

273 PPM
16 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 3 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 3 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
3 USGS-backed sources
3 matched systems 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 66712

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.

3 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.
Pittsburg, City Of
KS2003705
Very Hard
273 PPMgroundwater20,738 servedHigh Confidence - USGS Monitoring
Crawford Co Rwd 2
KS2003717
Very Hard
273 PPMsurface water1,460 servedHigh Confidence - USGS Monitoring
Arma, City Of
KS2003713
Very Hard
273 PPMsurface water1,406 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

6673527366756273667112726673427366763273667432616476935667412006476235667622736472855266746273

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 Arma, KS (66712).

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Frequently Asked Questions

Is the water hard in Arma, KS (66712)?

The average water hardness in 66712 is 273 PPM (16 GPG), which is classified as very hard.

Do I need a water softener in 66712?

With hardness of 273 PPM, a water softener is recommended for homes in 66712.

Is hard water in 66712 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 66712?

Zip code 66712 in Arma, Kansas is served by 3 water systems.

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