Hardness
Very Hard
230.5 PPM · 13.5 GPG
Local water dashboard
Official source aggregationWater quality in Rolla, MO 65401
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Phelps County.
No active health-based violation reported
- Primary matched system
- Rolla Pws
- Source water
- Groundwater
- County
- Phelps 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
0.0039 mg/L
26% of action level
Utility match
6 systems
Serves 20,800 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
230.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
230.5
mg/L as CaCO₃ equivalent
Grains per gallon
13.5
1 GPG ≈ 17.1 PPM
What this means at home
At 230.5 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
24
Nearest site
5.3 mi
Observation range
Apr 28, 2016–Apr 7, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: T38N R07W 31DBC1 (Well).USGS source documentation ↗
Regional context
Is 65401 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Rolla median
255 PPM
24 PPM lower2 indexed ZIP readings · Range 230.5–280 PPM
Missouri median
236 PPM
5 PPM lower556 indexed ZIP readings · Range 38.3–483 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)
0.0039 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.
Lead (90th percentile)
Measured in mg/L
Local 0.0039
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 27
- Health-based
- 1
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | MO3048123 | Resolved | Nov 1, 2025through Nov 30, 2025 |
| LEAD AND COPPER RULE REVISIONS | MO3010700 | Unaddressed | Jul 2, 2025 |
| Groundwater Rule | MO3048123 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| Groundwater Rule | MO3048123 | Archived | Dec 1, 2024through Dec 31, 2024 |
| Revised Total Coliform RuleHealth-based | MO3048123 | Resolved | Nov 25, 2024through Dec 24, 2024 |
| Lead and Copper Rule | MO3048123 | Unaddressed | Oct 1, 2024 |
| Revised Total Coliform Rule | MO3048123 | Resolved | Feb 1, 2024through Feb 29, 2024 |
| Lead and Copper Rule | MO3048123 | Resolved | Oct 1, 2023through Jul 25, 2024 |
| Public Notice | MO3048123 | Resolved | Sep 10, 2023through Sep 10, 2023 |
| Public Notice | MO3048123 | Resolved | Jun 30, 2023through Aug 30, 2023 |
| Groundwater Rule | MO3048123 | Resolved | May 1, 2023through May 31, 2023 |
| Revised Total Coliform Rule | MO3048123 | Resolved | Apr 1, 2023through Apr 30, 2023 |
| Groundwater Rule | MO3048123 | Resolved | Jan 1, 2023through Jan 31, 2023 |
| Revised Total Coliform Rule | MO3048123 | Resolved | Dec 1, 2022through Dec 31, 2022 |
| Groundwater Rule | MO3048123 | Resolved | Nov 1, 2022through Nov 30, 2022 |
| Revised Total Coliform Rule | MO3024467 | Resolved | Sep 1, 2022through Sep 30, 2022 |
| Revised Total Coliform Rule | MO3024466 | Resolved | Sep 1, 2022through Sep 30, 2022 |
| Revised Total Coliform Rule | MO3048123 | Resolved | Sep 1, 2022through Sep 30, 2022 |
| Groundwater Rule | MO3048123 | Resolved | Jul 1, 2022through Jul 31, 2022 |
| Revised Total Coliform Rule | MO3048123 | Resolved | Jun 1, 2022through Jun 30, 2022 |
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 Rolla ZIP 65401 using 230.5 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
230.5 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.
Nearby indexed reports
Compare ZIPs in Rolla
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for Rolla
Is tap water safe in Rolla?+
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 230.5 PPM, or 13.5 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 230.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.