Hardness
Very Hard
352.5 PPM · 20.6 GPG
Local water dashboard
Official source aggregationWater quality in Decatur, IN 46733
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Adams County.
No active health-based violation reported
- Primary matched system
- Decatur Water Department
- Source water
- Groundwater
- County
- Adams 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 mg/L
0% of action level
Utility match
3 systems
Serves 9,900 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
352.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
352.5
mg/L as CaCO₃ equivalent
Grains per gallon
20.6
1 GPG ≈ 17.1 PPM
What this means at home
At 352.5 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
42
Nearest site
44.1 mi
Observation range
Jun 20, 2016–Sep 10, 2025
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: DE-28 (Well).USGS source documentation ↗
Regional context
Is 46733 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Decatur median
353 PPM
About the same1 indexed ZIP readings · Range 352.5–352.5 PPM
Indiana median
313 PPM
40 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 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
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 11
- Health-based
- 4
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Radium-226 | IN5201006 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Radium-228 | IN5201006 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Gross Alpha, Excl. Radon and U | IN5201006 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Consumer Confidence Rule | IN5201006 | Resolved | Oct 1, 2025through Feb 19, 2026 |
| Revised Total Coliform Rule | IN5201006 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Consumer Confidence Rule | IN5201006 | Unaddressed | Jul 1, 2025 |
| Lead and Copper Rule | IN5201006 | Resolved | Jan 1, 2024through Jan 28, 2025 |
| Revised Total Coliform RuleHealth-based | IN5201009 | Resolved | Oct 1, 2023through Oct 31, 2023 |
| Groundwater RuleHealth-based | IN5201006 | Resolved | Jan 21, 2022through Mar 3, 2023 |
| Groundwater RuleHealth-based | IN5201006 | Resolved | Jan 21, 2022through Mar 3, 2023 |
| Groundwater RuleHealth-based | IN5201006 | Resolved | Jan 21, 2022through Mar 3, 2023 |
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 Decatur ZIP 46733 using 352.5 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
352.5 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
Water questions for Decatur
Is tap water safe in Decatur?+
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 352.5 PPM, or 20.6 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 352.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.