Hardness
Very Hard
330.5 PPM · 19.3 GPG
Local water dashboard
Official source aggregationWater quality in Herrick, IL 62431
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
- Herrick
- Source 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
0.0031 mg/L
21% of action level
Utility match
1 system
Serves 358 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
330.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
330.5
mg/L as CaCO₃ equivalent
Grains per gallon
19.3
1 GPG ≈ 17.1 PPM
What this means at home
At 330.5 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
20
Nearest site
53.1 mi
Observation range
Jun 4, 2018–Aug 23, 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 62431 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Herrick median
331 PPM
About the same1 indexed ZIP readings · Range 330.5–330.5 PPM
Illinois median
285 PPM
46 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)
0.0031 mg/L
Reported Dec 31, 2025
Copper (CU90)
2 mg/L
Reported Dec 31, 2025
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0031
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 2
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 6
- Health-based
- 1
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | IL1730150 | Unaddressed | Jul 2, 2025 |
| Total Haloacetic Acids (HAA5) | IL1730150 | Archived | Jan 1, 2025through Dec 31, 2025 |
| Lead and Copper RuleHealth-based | IL1730150 | Unaddressed | Apr 2, 2023 |
| Lead and Copper Rule | IL1730150 | Resolved | Dec 30, 2022through Jan 12, 2023 |
| Consumer Confidence Rule | IL1730150 | Resolved | Jul 1, 2022through Oct 4, 2023 |
| Consumer Confidence Rule | IL1730150 | Resolved | Jul 1, 2021through Aug 27, 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 Herrick ZIP 62431 using 330.5 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
330.5 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
Under-Sink Reverse Osmosis System
Copper (90th percentile), Lead and Copper Rule 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.
Frequently asked
Water questions for Herrick
Is tap water safe in Herrick?+
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 330.5 PPM, or 19.3 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 330.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.