Hardness
Very Hard
293 PPM · 17.1 GPG
Local water dashboard
Official source aggregationWater quality in Carbon Cliff, IL 61239
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Rock Island County.
1 reported benchmark flag
- Primary matched system
- Carbon Cliff
- Source water
- Groundwater
- County
- Rock Island County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0.0033 mg/L
22% of action level
Utility match
1 system
Serves 2,134 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
293 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
293
mg/L as CaCO₃ equivalent
Grains per gallon
17.1
1 GPG ≈ 17.1 PPM
What this means at home
At 293 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
34
Nearest site
10.2 mi
Observation range
May 22, 2017–Sep 4, 2019
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 17N 2W-36.7h1 (Well).USGS source documentation ↗
Regional context
Is 61239 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Carbon Cliff median
293 PPM
About the same1 indexed ZIP readings · Range 293–293 PPM
Illinois median
285 PPM
8 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)
0.0033 mg/L
Reported Dec 31, 2025
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0033
EPA limit 0.015
Combined Radium (-226 and -228)
Measured in PCI/L
Local 6
EPA limit 5
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 9
- Health-based
- 1
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | IL1610100 | Resolved | Feb 16, 2025through Mar 14, 2025 |
| Combined Radium (-226 and -228) | IL1610100 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Combined Radium (-226 and -228)Health-basedReported 6 PCI/L · MCL 5 | IL1610100 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Consumer Confidence Rule | IL1610100 | Resolved | Jul 1, 2023through May 2, 2024 |
| Combined Radium (-226 and -228) | IL1610100 | Resolved | Jan 1, 2023through Mar 31, 2023 |
| Lead and Copper Rule | IL1610100 | Resolved | Oct 1, 2022through Aug 12, 2024 |
| Combined Radium (-226 and -228) | IL1610100 | Resolved | Oct 1, 2021through Dec 31, 2021 |
| Revised Total Coliform Rule | IL1610100 | Resolved | Jul 1, 2021through Jul 31, 2021 |
| Chlorine | IL1610100 | Resolved | Jul 1, 2021through Aug 6, 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 Carbon Cliff ZIP 61239 using 293 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
293 PPM is 2× 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
Combined Radium (-226 and -228) has 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.
Frequently asked
Water questions for Carbon Cliff
Is tap water safe in Carbon Cliff?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Nearby USGS observations produce an estimate of 293 PPM, or 17.1 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 293 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.