Hardness
Very Hard
318 PPM · 18.6 GPG
Local water dashboard
Official source aggregationWater quality in Rock Falls, IL 61071
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Whiteside County.
No active health-based violation reported
- Primary matched system
- Rock Falls
- Source water
- Groundwater
- County
- Whiteside 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
0.0031 mg/L
21% of action level
Utility match
2 systems
Serves 8,620 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
318 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
318
mg/L as CaCO₃ equivalent
Grains per gallon
18.6
1 GPG ≈ 17.1 PPM
What this means at home
At 318 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
37
Nearest site
27.1 mi
Observation range
May 22, 2017–May 3, 2021
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 24N 6E- 5.5e1 (Well).USGS source documentation ↗
Regional context
Is 61071 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Rock Falls median
318 PPM
About the same1 indexed ZIP readings · Range 318–318 PPM
Illinois median
285 PPM
33 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 pass
Lead (PB90)
0.0031 mg/L
Reported Dec 31, 2025
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0031
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 11
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | IL1955165 | Unaddressed | Oct 1, 2024 |
| Consumer Confidence Rule | IL1950450 | Resolved | Jul 1, 2023through May 16, 2024 |
| Consumer Confidence Rule | IL1955165 | Resolved | Jul 1, 2023through Feb 26, 2024 |
| Chlorine | IL1950450 | Resolved | Apr 1, 2023through Jun 22, 2023 |
| Revised Total Coliform Rule | IL1950450 | Resolved | Dec 1, 2022through Dec 31, 2022 |
| Chlorine | IL1950450 | Resolved | Oct 1, 2022through Dec 31, 2022 |
| Consumer Confidence Rule | IL1950450 | Resolved | Jul 1, 2022through Jul 28, 2022 |
| Consumer Confidence Rule | IL1955165 | Resolved | Jul 1, 2022through Jul 28, 2022 |
| TTHM | IL1955165 | Resolved | Jan 1, 2022through Dec 31, 2024 |
| Total Haloacetic Acids (HAA5) | IL1955165 | Resolved | Jan 1, 2022through Dec 31, 2024 |
| Lead and Copper Rule | IL1955165 | Resolved | Dec 30, 2021through May 4, 2022 |
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 Rock Falls ZIP 61071 using 318 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
318 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 systemsAffiliate 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 Rock Falls
Is tap water safe in Rock Falls?+
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 318 PPM, or 18.6 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 318 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.