Hardness
Very Hard
222 PPM · 13 GPG
Local water dashboard
Official source aggregationA 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.
At a glance
EPA quarter 2026Q2
Hardness
Very Hard
222 PPM · 13 GPG
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0 mg/L
0% of action level
Utility match
3 systems
Serves 21,374 people system-wide
Hardness meter
Estimated local hardness
USGS hardness classification scale
222 PPM
Parts per million
222
mg/L as CaCO₃ equivalent
Grains per gallon
13
1 GPG ≈ 17.1 PPM
What this means at home
At 222 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
3
Nearest site
12.4 mi
Observation range
Feb 16, 2016–Jun 3, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: GREEN RIVER NEAR GENESEO, IL (Stream).USGS source documentation ↗
Regional context
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
East Moline median
222 PPM
About the same1 indexed ZIP readings · Range 222–222 PPM
Illinois median
285 PPM
63 PPM lower1065 indexed ZIP readings · Range 115–408 PPM
EPA benchmark screen
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
Lead (PB90)
0 mg/L
Reported Dec 31, 2026
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.
Measured in mg/L
Local 0
EPA limit 0.015
100% line = listed limit
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | IL1610350 | Resolved | Aug 22, 2025through Sep 4, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | IL1610350 | Resolved | Oct 17, 2024through Jul 1, 2025 |
| Consumer Confidence Rule | IL1610250 | Resolved | Jul 1, 2024through Nov 13, 2024 |
| Lead and Copper Rule | IL1610350 | Resolved | Oct 1, 2023through Oct 8, 2024 |
| Consumer Confidence Rule | IL1610350 | Resolved | Jul 1, 2023through May 3, 2024 |
| CARBON, TOTAL | IL1610250 | Resolved | Jul 1, 2022through Sep 30, 2022 |
| Consumer Confidence Rule | IL1610350 | Resolved | Jul 1, 2022through Jul 27, 2022 |
| Consumer Confidence Rule | IL1610350 | Resolved | Jul 1, 2022through Sep 8, 2022 |
| Lead and Copper Rule | IL1610250 | Resolved | Jul 1, 2021through Dec 31, 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
Matched to East Moline ZIP 61244 using 222 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
222 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 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
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.
Nearby USGS observations produce an estimate of 222 PPM, or 13 grains per gallon, classified as very hard. This is not a household tap measurement.
At 222 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.