Hardness
Very Hard
315 PPM · 18.4 GPG
Local water dashboard
Official source aggregationWater quality in Windsor, IL 61957
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Shelby County.
1 active health-based violation
- Primary matched system
- Windsor
- Source water
- Surface water + Groundwater
- County
- Shelby County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
1 active health-based record
Lead 90th percentile
0 mg/L
0% of action level
Utility match
2 systems
Serves 1,200 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
315 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
315
mg/L as CaCO₃ equivalent
Grains per gallon
18.4
1 GPG ≈ 17.1 PPM
What this means at home
At 315 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
27
Nearest site
33.2 mi
Observation range
May 1, 2018–Aug 22, 2023
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 17N 5E-24.2h1 (Well).USGS source documentation ↗
Regional context
Is 61957 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Windsor median
302 PPM
13 PPM higher2 indexed ZIP readings · Range 288–315 PPM
Illinois median
285 PPM
30 PPM higher1065 indexed ZIP readings · Range 115–408 PPM
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass1 fail
Lead (PB90)
0 mg/L
Reported Dec 31, 2025
Copper (CU90)
1.62 mg/L
Reported Dec 31, 2014
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.62
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 12
- Health-based
- 2
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | IL1310500 | Unaddressed | Aug 22, 2025 |
| LEAD AND COPPER RULE REVISIONS | IL1310500 | Unaddressed | Jul 2, 2025 |
| Consumer Confidence Rule | IL1310500 | Unaddressed | Jul 1, 2025 |
| LEAD AND COPPER RULE REVISIONS | IL1310500 | Unaddressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONSHealth-based | IL1310500 | Unaddressed | Oct 17, 2024 |
| Public Notice | IL1310500 | Unaddressed | Oct 11, 2024 |
| Lead and Copper Rule | IL1310500 | Resolved | Oct 1, 2023through Feb 29, 2024 |
| Public Notice | IL1730550 | Resolved | Feb 17, 2023through Jul 3, 2023 |
| Total Haloacetic Acids (HAA5) | IL1730550 | Resolved | Jan 1, 2023through Dec 31, 2023 |
| TTHM | IL1730550 | Resolved | Jan 1, 2023through Dec 31, 2023 |
| Lead and Copper RuleHealth-based | IL1730550 | Resolved | Jan 25, 2022through Apr 22, 2022 |
| Consumer Confidence Rule | IL1730550 | Resolved | Jul 1, 2021through Nov 8, 2021 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Windsor ZIP 61957 using 315 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
315 PPM is 3× the high-hardness trigger used by this matcher.
Designed to reduce scale on fixtures, water heaters, glassware, and plumbing throughout the home.
Compare whole-house systemsDrinking water protection
Under-Sink Reverse Osmosis System
Copper (90th percentile), LEAD AND COPPER RULE REVISIONS have a measured benchmark flag or active health-based SDWIS record in this profile.
A certified multi-stage RO system targets a broader range of dissolved contaminants at the kitchen tap.
Explore under-sink filtrationAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Nearby indexed reports
Compare ZIPs in Windsor
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Windsor
Is tap water safe in Windsor?+
EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
How hard is the water?+
Nearby USGS observations produce an estimate of 315 PPM, or 18.4 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 315 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.