Hardness
Very Hard
348 PPM · 20.4 GPG
Local water dashboard
Official source aggregationWater quality in Martinsburg, MO 65264
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Audrain County.
No active health-based violation reported
- Primary matched system
- Martinsburg Pws
- Source water
- Groundwater
- County
- Audrain 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 559 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
348 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
348
mg/L as CaCO₃ equivalent
Grains per gallon
20.4
1 GPG ≈ 17.1 PPM
What this means at home
At 348 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
23
Nearest site
26.5 mi
Observation range
Apr 11, 2016–Apr 9, 2026
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: T64N R05W 14CBB 11939 (Well).USGS source documentation ↗
Regional context
Is 65264 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Martinsburg median
348 PPM
About the same1 indexed ZIP readings · Range 348–348 PPM
Missouri median
236 PPM
112 PPM higher556 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)
0.0016 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 0.0016
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 39
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | MO2010506 | Resolved | Oct 1, 2025through Oct 31, 2025 |
| LEAD AND COPPER RULE REVISIONS | MO2010506 | Unaddressed | Jul 2, 2025 |
| Consumer Confidence Rule | MO2010506 | Resolved | Jul 1, 2025through Feb 26, 2026 |
| Nitrate-Nitrite | MO2010506 | Archived | Jan 1, 2025through Dec 31, 2025 |
| LEAD AND COPPER RULE REVISIONS | MO2010506 | Resolved | Oct 17, 2024through Dec 19, 2024 |
| Lead and Copper Rule | MO2010506 | Resolved | Oct 1, 2024through Apr 2, 2025 |
| Consumer Confidence Rule | MO2010506 | Resolved | Jul 1, 2024through Feb 26, 2026 |
| Revised Total Coliform Rule | MO2010506 | Resolved | Sep 1, 2023through Sep 30, 2023 |
| Arsenic | MO2010506 | Archived | Jan 1, 2023through Dec 31, 2025 |
| Barium | MO2010506 | Archived | Jan 1, 2023through Dec 31, 2025 |
| Chromium | MO2010506 | Archived | Jan 1, 2023through Dec 31, 2025 |
| Fluoride | MO2010506 | Archived | Jan 1, 2023through Dec 31, 2025 |
| Mercury | MO2010506 | Archived | Jan 1, 2023through Dec 31, 2025 |
| Antimony, Total | MO2010506 | Archived | Jan 1, 2023through Dec 31, 2025 |
| Thallium, Total | MO2010506 | Archived | Jan 1, 2023through Dec 31, 2025 |
| cis-1,2-Dichloroethylene | MO2010506 | Resolved | Jan 1, 2023through Dec 31, 2025 |
| Xylenes, Total | MO2010506 | Resolved | Jan 1, 2023through Dec 31, 2025 |
| 1,2-Dichloropropane | MO2010506 | Resolved | Jan 1, 2023through Dec 31, 2025 |
| Trichloroethylene | MO2010506 | Resolved | Jan 1, 2023through Dec 31, 2025 |
| 1,1,2-Trichloroethane | MO2010506 | Resolved | Jan 1, 2023through Dec 31, 2025 |
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 Martinsburg ZIP 65264 using 348 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
348 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 Martinsburg
Is tap water safe in Martinsburg?+
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 348 PPM, or 20.4 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 348 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.