WH

Water Hardness in 61077

Seward, Illinois · Winnebago County

300 PPM
17.5 GPG
Very 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
3 verified treated-water sources
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 61077

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.
Rockford
IL2010300
Very Hard
300 PPMgroundwater147,051 servedVerified - Annual Water Quality Report
Source water: 317 PPM
North Park Pwd
IL2015500
Very Hard
300 PPMgroundwater35,580 servedVerified - Annual Water Quality Report
Source water: 297 PPM
Loves Park
IL2010150
Very Hard
300 PPMgroundwater23,335 servedVerified - Annual Water Quality Report
Source water: 297 PPM

Nearby Zip Codes

610883006106330061047317610392996106729961010317611023006108431761101300610071486105431761070299

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 Seward, IL (61077).

Submit Your Data

Frequently Asked Questions

Is the water hard in Seward, IL (61077)?

The average water hardness in 61077 is 300 PPM (17.5 GPG), which is classified as very hard.

Do I need a water softener in 61077?

With hardness of 300 PPM, a water softener is recommended for homes in 61077.

Is hard water in 61077 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 61077?

Zip code 61077 in Seward, Illinois is served by 3 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.

8 min read

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.

10 min read

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.

8 min read