Where does the water in 66541 come from?

Water for zip code 66541 in Summerfield, Kansas 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 66541

Summerfield, Kansas · Marshall County

319 PPM

18.7 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 66541

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
Summerfield, City Of KS2011702	groundwater	319 PPM Very Hard	126	High Confidence - USGS Monitoring

Summerfield, City Of

KS2011702

Very Hard

319 PPMgroundwater126 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

66406319 66403319 68381312 68323263 68420436 66518319 66404200 68309313 66438330 68466295 68345436 68441263

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 Summerfield, KS (66541).

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Frequently Asked Questions

Is the water hard in Summerfield, KS (66541)?

The average water hardness in 66541 is 319 PPM (18.7 GPG), which is classified as very hard.

Do I need a water softener in 66541?

With hardness of 319 PPM, a water softener is recommended for homes in 66541.

Is hard water in 66541 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 66541?

Zip code 66541 in Summerfield, Kansas is served by 1 water system.