Hardness
Very Hard
343 PPM · 20.1 GPG
Local water dashboard
Official source aggregationWater quality in Dupont, IN 47231
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Jefferson County.
No active health-based violation reported
- Primary matched system
- Dupont Water Company
- Source water
- Groundwater
- County
- Jefferson 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
0.0033 mg/L
22% of action level
Utility match
1 system
Serves 3,865 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
343 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
343
mg/L as CaCO₃ equivalent
Grains per gallon
20.1
1 GPG ≈ 17.1 PPM
What this means at home
At 343 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
50
Nearest site
12.1 mi
Observation range
Jun 12, 2019–Sep 10, 2025
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: IN5239006 JEFFERSON 00711 PRODUCTION WELL 1JPG (Well).USGS source documentation ↗
Regional context
Is 47231 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Dupont median
343 PPM
About the same1 indexed ZIP readings · Range 343–343 PPM
Indiana median
313 PPM
30 PPM higher472 indexed ZIP readings · Range 132–371 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)
0.0033 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 0.0033
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 5
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | IN5240004 | Unaddressed | Jan 1, 2026 |
| Consumer Confidence Rule | IN5240004 | Resolved | Jul 1, 2023through Oct 11, 2024 |
| Lead and Copper Rule | IN5240004 | Resolved | Jan 1, 2023through Jan 28, 2025 |
| Consumer Confidence Rule | IN5240004 | Resolved | Jul 1, 2022through Aug 22, 2022 |
| Consumer Confidence Rule | IN5240004 | Resolved | Jul 1, 2021through Oct 1, 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 Dupont ZIP 47231 using 343 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
343 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 Dupont
Is tap water safe in Dupont?+
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 343 PPM, or 20.1 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 343 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.