Hardness
Very Hard
200 PPM · 11.7 GPG
Local water dashboard
Official source aggregationWater quality in Diagonal, IA 50845
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Ringgold County.
No active health-based violation reported
- Primary matched system
- Diagonal Water Department
- Source water
- Surface water
- County
- Ringgold 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
0.0016 mg/L
11% of action level
Utility match
1 system
Serves 338 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
200 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
200
mg/L as CaCO₃ equivalent
Grains per gallon
11.7
1 GPG ≈ 17.1 PPM
What this means at home
At 200 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
9
Nearest site
25.1 mi
Observation range
Jan 11, 2016–Jul 28, 2025
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Middle Fork Grand River near Grant City, MO (Stream).USGS source documentation ↗
Regional context
Is 50845 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Diagonal median
200 PPM
About the same1 indexed ZIP readings · Range 200–200 PPM
Iowa median
281 PPM
81 PPM lower721 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 pass
Lead (PB90)
0.0016 mg/L
Reported Dec 31, 2022
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 0.0016
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 11
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHM | IA8018040 | Resolved | Nov 1, 2025through Nov 30, 2025 |
| Total Haloacetic Acids (HAA5) | IA8018040 | Resolved | Nov 1, 2025through Nov 30, 2025 |
| Lead and Copper Rule | IA8018040 | Unaddressed | Jun 1, 2025 |
| Public Notice | IA8018040 | Unaddressed | Mar 21, 2025 |
| Public Notice | IA8018040 | Unaddressed | Oct 21, 2024 |
| Nitrite | IA8018040 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Revised Total Coliform Rule | IA8018040 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| Nitrite | IA8018040 | Resolved | Apr 1, 2024through Jun 30, 2024 |
| Nitrite | IA8018040 | Resolved | Jan 1, 2024through Mar 31, 2024 |
| Revised Total Coliform Rule | IA8018040 | Resolved | Apr 1, 2023through Apr 30, 2023 |
| Revised Total Coliform Rule | IA8018040 | Resolved | Aug 1, 2021through Aug 31, 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 Diagonal ZIP 50845 using 200 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
200 PPM is 2× 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 Diagonal
Is tap water safe in Diagonal?+
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 200 PPM, or 11.7 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 200 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.