Hardness
Very Hard
384.5 PPM · 22.5 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 Dekalb County.
At a glance
EPA quarter 2026Q2
Hardness
Very Hard
384.5 PPM · 22.5 GPG
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0.005 mg/L
34% of action level
Utility match
1 system
Serves 1,160 people system-wide
Hardness meter
Estimated local hardness
USGS hardness classification scale
384.5 PPM
Parts per million
384.5
mg/L as CaCO₃ equivalent
Grains per gallon
22.5
1 GPG ≈ 17.1 PPM
What this means at home
At 384.5 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
74
Nearest site
9.8 mi
Observation range
May 30, 2017–Aug 21, 2023
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 43N5E-27.4h1 (14-RIL-S) (Well).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.
Kingston median
385 PPM
About the same1 indexed ZIP readings · Range 384.5–384.5 PPM
Illinois median
285 PPM
100 PPM higher1065 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)
0.005 mg/L
Reported Dec 31, 2025
Copper (CU90)
1.43 mg/L
Reported Dec 31, 2021
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Measured in mg/L
Local 0.005
EPA limit 0.015
Measured in mg/L
Local 1.43
EPA limit 1.3
100% line = listed limit
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper RuleHealth-based | IL0370250 | Resolved | Jan 2, 2022through Feb 16, 2023 |
| Lead and Copper Rule | IL0370250 | 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 Kingston ZIP 60145 using 384.5 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
384.5 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
Copper (90th percentile) 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
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 384.5 PPM, or 22.5 grains per gallon, classified as very hard. This is not a household tap measurement.
At 384.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.