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Water Hardness in 74825

Allen, Oklahoma · Pontotoc County

340 PPM
19.9 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
1 USGS-backed source
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 74825

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.
Ada
OK2006201
Very Hard
338 PPMgroundwater22,600 servedHigh Confidence - USGS Monitoring
Hughes Co. Rwd #6 (Gerty)
OK2003224
Very Hard
352 PPMgroundwater2,180 servedEstimated - Nearby Data
Allen Pwa
OK2006202
Very Hard
352 PPMgroundwater937 servedEstimated - Nearby Data

Nearby Zip Codes

748271547453135274844338748671707457230574534154745703527482033874871339748481637484233974538186

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 Allen, OK (74825).

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Frequently Asked Questions

Is the water hard in Allen, OK (74825)?

The average water hardness in 74825 is 340 PPM (19.9 GPG), which is classified as very hard.

Do I need a water softener in 74825?

With hardness of 340 PPM, a water softener is recommended for homes in 74825.

Is hard water in 74825 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 74825?

Zip code 74825 in Allen, Oklahoma is served by 3 water systems.

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