Hardness
Very Hard
472 PPM · 27.6 GPG
Local water dashboard
Official source aggregationWater quality in Dedham, IA 51440
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Carroll County.
1 reported benchmark flag
- Primary matched system
- Dedham Water Supply
- Source water
- Groundwater
- County
- Carroll 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
0.001 mg/L
7% of action level
Utility match
1 system
Serves 221 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
472 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
472
mg/L as CaCO₃ equivalent
Grains per gallon
27.6
1 GPG ≈ 17.1 PPM
What this means at home
At 472 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
17
Nearest site
58 mi
Observation range
Jun 28, 2017–May 27, 2026
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 082N24W30DBBC 22683 1970Slater 3 (Well).USGS source documentation ↗
Regional context
Is 51440 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Dedham median
472 PPM
About the same1 indexed ZIP readings · Range 472–472 PPM
Iowa median
281 PPM
191 PPM higher721 indexed ZIP readings · Range 182–834 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)
0.001 mg/L
Reported Dec 31, 2024
Copper (CU90)
1.61 mg/L
Reported Jun 30, 1994
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.001
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.61
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 19
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHM | IA1433016 | Archived | Aug 1, 2025through Aug 31, 2025 |
| Total Haloacetic Acids (HAA5) | IA1433016 | Archived | Aug 1, 2025through Aug 31, 2025 |
| Consumer Confidence Rule | IA1433016 | Resolved | Jul 1, 2025through Sep 11, 2025 |
| Lead and Copper Rule | IA1433016 | Unaddressed | Jun 1, 2025 |
| Lead and Copper Rule | IA1433016 | Unaddressed | Oct 1, 2024 |
| Total Haloacetic Acids (HAA5) | IA1433016 | Resolved | Aug 1, 2023through Aug 31, 2023 |
| TTHM | IA1433016 | Resolved | Aug 1, 2023through Aug 31, 2023 |
| Consumer Confidence Rule | IA1433016 | Resolved | Jul 1, 2023through Oct 2, 2023 |
| Lead and Copper Rule | IA1433016 | Resolved | Jun 1, 2023through Sep 23, 2024 |
| Lead and Copper Rule | IA1433016 | Resolved | Sep 1, 2022through Apr 26, 2023 |
| Total Haloacetic Acids (HAA5) | IA1433016 | Resolved | Aug 1, 2022through Aug 31, 2022 |
| TTHM | IA1433016 | Resolved | Aug 1, 2022through Aug 31, 2022 |
| Consumer Confidence Rule | IA1433016 | Resolved | Jul 1, 2022through Mar 2, 2023 |
| Lead and Copper Rule | IA1433016 | Resolved | Mar 1, 2022through Apr 26, 2023 |
| Total Haloacetic Acids (HAA5) | IA1433016 | Archived | Aug 1, 2021through Aug 31, 2021 |
| TTHM | IA1433016 | Archived | Aug 1, 2021through Aug 31, 2021 |
| Consumer Confidence Rule | IA1433016 | Resolved | Jul 1, 2021through Sep 23, 2021 |
| Consumer Confidence Rule | IA1433016 | Unaddressed | Jul 1, 2020 |
| Lead and Copper Rule | IA1433016 | Unaddressed | Dec 1, 2018 |
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 Dedham ZIP 51440 using 472 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
472 PPM is 4× 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) 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
Water questions for Dedham
Is tap water safe in Dedham?+
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 472 PPM, or 27.6 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 472 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.