Hardness
Very Hard
326.5 PPM · 19.1 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 Marion County.
At a glance
EPA quarter 2026Q2
Hardness
Very Hard
326.5 PPM · 19.1 GPG
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0 mg/L
0% of action level
Utility match
1 system
Serves 236 people system-wide
Hardness meter
Estimated local hardness
USGS hardness classification scale
326.5 PPM
Parts per million
326.5
mg/L as CaCO₃ equivalent
Grains per gallon
19.1
1 GPG ≈ 17.1 PPM
What this means at home
At 326.5 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
12.4 mi
Observation range
May 30, 2017–Aug 1, 2024
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 077N18W08BBDC 1997NAWQA Marion Co IADRN-8 (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.
Harvey median
327 PPM
About the same1 indexed ZIP readings · Range 326.5–326.5 PPM
Iowa median
281 PPM
46 PPM higher721 indexed ZIP readings · Range 182–834 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, 2024
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 |
|---|---|---|---|
| Revised Total Coliform Rule | IA6338000 | Resolved | Mar 1, 2024through Mar 31, 2024 |
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 Harvey ZIP 50119 using 326.5 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
326.5 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 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 326.5 PPM, or 19.1 grains per gallon, classified as very hard. This is not a household tap measurement.
At 326.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.