Where does the water in 61957 come from?

Water for zip code 61957 in Windsor, Illinois is provided by 2 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 61957

Windsor, Illinois · Shelby County

243 PPM

14.2 GPG

Hard

0Soft60120180300+

High Confidence — USGS Monitoring

Dataset updated March 9, 2026Matched to 2 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 2 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

2 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.

Water source profile

Primarily surface water

Surface-water hardness can shift with reservoirs, runoff, season, and treatment. 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 61957

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.

2 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
Windsor IL1730550	surface water	259 PPM Very Hard	1,200	Estimated — Nearby Data
New Windsor IL1310500	groundwater	216 PPM Hard	740	High Confidence — USGS Monitoring

Windsor

IL1730550

Very Hard

259 PPMsurface water1,200 servedEstimated — Nearby Data

New Windsor

IL1310500

Hard

216 PPMgroundwater740 servedHigh Confidence — USGS Monitoring

Nearby Zip Codes

61928120 62465120 62565228 61951329 62463228 62534259 62447228 61938308 62444120 61914259 62438410 62462120

What This Means For You

Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.

Hard Water - Treatment Recommended

Your water is hard. Scale buildup is likely affecting your plumbing and appliances, reducing their lifespan and efficiency. A water softener is recommended to protect your home.

Recommended Products

Salt-Based Water Softener

Our PickAFWFilters Fleck 5600SXT 48K Also GreatWhirlpool WHES40E 40K Also GreatAFWFilters 64K Grain Also GreatAFWFilters Iron Pro 2 64K Also GreatSpringWell Filter + Softener Combo

Salt-Free Water Conditioner

Our PickSpringWell Salt-Free Cartridge

Water Hardness Test Kit

Our PickVarify (150 Strips)Also GreatJNW Direct (150 Strips)

Shower Head Filter

Our PickWeddell Duo Also GreatAquaBliss SF100 Also GreatSprite Pure 7-Setting Also GreatAqua Earth 20-Stage

Water Softener Salt

Our PickMorton Clean & Protect Also GreatDiamond Crystal Bright & Soft

Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | 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 Windsor, IL (61957).

Submit Your Data

Frequently Asked Questions

Is the water hard in Windsor, IL (61957)?

The average water hardness in 61957 is 243 PPM (14.2 GPG), which is classified as hard.

Do I need a water softener in 61957?

With hardness of 243 PPM, a water softener is recommended for homes in 61957.

Is hard water in 61957 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 61957?

Zip code 61957 in Windsor, Illinois is served by 2 water systems.