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Water Hardness in 61240

Coal Valley, Illinois · Rock Island County

296 PPM
17.3 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 11 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 11 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
9 USGS-backed sources
11 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 61240

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.

11 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.
Moline
IL1610450
Very Hard
296 PPMsurface water44,500 servedHigh Confidence - USGS Monitoring
Rock Island
IL1610650
Very Hard
296 PPMsurface water39,018 servedHigh Confidence - USGS Monitoring
East Moline
IL1610250
Very Hard
296 PPMsurface water21,374 servedEstimated - County Avg
Rock Island Arsenal, Us Army
IL1615387
Very Hard
296 PPMsurface water7,800 servedEstimated - County Avg
Coal Valley
IL1614260
Very Hard
296 PPMgroundwater3,873 servedHigh Confidence - USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

612733076126529661282296612392966124429661241319612362966120129661264296612743226128121661256296

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 Coal Valley, IL (61240).

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Frequently Asked Questions

Is the water hard in Coal Valley, IL (61240)?

The average water hardness in 61240 is 296 PPM (17.3 GPG), which is classified as very hard.

Do I need a water softener in 61240?

With hardness of 296 PPM, a water softener is recommended for homes in 61240.

Is hard water in 61240 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 61240?

Zip code 61240 in Coal Valley, Illinois is served by 11 water systems.

Learn More About Your Water

How to Test Water Hardness at Home

Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.

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Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

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Well Water Hardness: Why It's Usually Hard & How to Treat It

Well water is almost always harder than city water. Learn why, how to test your well, and the best treatment options for hard well water.

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