Where does the water in 50666 come from?

Water for zip code 50666 in Plainfield, Iowa is provided by 3 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 50666

Plainfield, Iowa · Bremer County

211 PPM

12.4 GPG

Hard

0Soft60120180300+

Verified - Annual Water Quality Report

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 verified treated-water source

3 matched systems 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 50666

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.

Water System	Source	Hardness	Pop. Served	Data Source
Ia Regional Utilities Assoc (Waverly) IA0990701	groundwater	200 PPM Hard USGS estimate: 380 PPM	37,820	Verified - Annual Water Quality Report
Waverly Water Department IA0990085	groundwater	251 PPM Very Hard	10,394	High Confidence - USGS Monitoring
Plainfield Water Supply IA0960045	groundwater	251 PPM Very Hard	393	High Confidence - USGS Monitoring

Ia Regional Utilities Assoc (Waverly)

IA0990701

Hard

200 PPMgroundwater37,820 servedVerified - Annual Water Quality Report

Source water: 380 PPM

Waverly Water Department

IA0990085

Very Hard

251 PPMgroundwater10,394 servedHigh Confidence - USGS Monitoring

Plainfield Water Supply

IA0960045

Very Hard

251 PPMgroundwater393 servedHigh Confidence - USGS Monitoring

Nearby Zip Codes

50658235 50677211 50619205 50631211 50645200 50676210 50670202 50647212 50622209 50636202 50630228 50616260

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 Plainfield, IA (50666).

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Frequently Asked Questions

Is the water hard in Plainfield, IA (50666)?

The average water hardness in 50666 is 211 PPM (12.4 GPG), which is classified as hard.

Do I need a water softener in 50666?

With hardness of 211 PPM, a water softener is recommended for homes in 50666.

Is hard water in 50666 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 50666?

Zip code 50666 in Plainfield, Iowa is served by 3 water systems.