Where does the water in 63438 come from?

Water for zip code 63438 in Durham, 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 63438

Durham, Missouri · Lewis County

120 PPM

7 GPG

Moderately Hard

0Soft60120180300+

Verified - Annual Water Quality Report

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 verified treated-water source

1 matched system total for this ZIP; treated-water reports are prioritized when available.

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 63438

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
City Of Columbia Utilities MO3010181	groundwater	120 PPM Moderately Hard USGS estimate: 285 PPM	126,254	Verified - Annual Water Quality Report

City Of Columbia Utilities

MO3010181

Moderately Hard

120 PPMgroundwater126,254 servedVerified - Annual Water Quality Report

Source water: 285 PPM

Nearby Zip Codes

63440157 63454257 63448188 63463235 63452157 63471257 63461257 63457120 63434120 63439120 63447157 62301362

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 Durham, MO (63438).

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Frequently Asked Questions

Is the water hard in Durham, MO (63438)?

The average water hardness in 63438 is 120 PPM (7 GPG), which is classified as moderately hard.

Do I need a water softener in 63438?

With hardness of 120 PPM, a water softener is worth considering for homes in 63438.

Is hard water in 63438 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 63438?

Zip code 63438 in Durham, Missouri is served by 1 water system.