Where does the water in 61071 come from?

Water for zip code 61071 in Rock Falls, Illinois 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 61071

Rock Falls, Illinois · Whiteside County

246 PPM

14.4 GPG

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 61071

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
Il American-Sterling IL1955040	groundwater	207 PPM Hard	14,782	High Confidence - USGS Monitoring
Rock Falls IL1950450	groundwater	312 PPM Very Hard	8,620	Estimated - Nearby Data
Country Acres Mhp (Whiteside County) IL1955135	groundwater	312 PPM Very Hard	232	Estimated - Nearby Data

Il American-Sterling

IL1955040

Hard

207 PPMgroundwater14,782 servedHigh Confidence - USGS Monitoring

Rock Falls

IL1950450

Very Hard

312 PPMgroundwater8,620 servedEstimated - Nearby Data

Country Acres Mhp (Whiteside County)

IL1955135

Very Hard

312 PPMgroundwater232 servedEstimated - Nearby Data

Nearby Zip Codes

61037207 61243207 61042312 61081207 61283211 61261210 61021312 61376312 61277221 61091148 61346300 61324312

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 Rock Falls, IL (61071).

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Frequently Asked Questions

Is the water hard in Rock Falls, IL (61071)?

The average water hardness in 61071 is 246 PPM (14.4 GPG), which is classified as hard.

Do I need a water softener in 61071?

With hardness of 246 PPM, a water softener is recommended for homes in 61071.

Is hard water in 61071 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 61071?

Zip code 61071 in Rock Falls, Illinois is served by 3 water systems.