Hardness
Very Hard
183 PPM · 10.7 GPG
Local water dashboard
Official source aggregationWater quality in Mount Vernon, MO 65712
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Lawrence County.
No active health-based violation reported
- Primary matched system
- Mount Vernon Pws
- Source water
- Groundwater
- County
- Lawrence 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
0.0028 mg/L
19% of action level
Utility match
2 systems
Serves 4,575 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
183 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
183
mg/L as CaCO₃ equivalent
Grains per gallon
10.7
1 GPG ≈ 17.1 PPM
What this means at home
At 183 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
45
Nearest site
4.3 mi
Observation range
May 4, 2016–Sep 4, 2025
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: MOLA-31 (Well).USGS source documentation ↗
Regional context
Is 65712 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Mount Vernon median
183 PPM
About the same1 indexed ZIP readings · Range 183–183 PPM
Missouri median
236 PPM
53 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)
0.0028 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 0.0028
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 38
- Health-based
- 5
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Groundwater Rule | MO5048294 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| LEAD AND COPPER RULE REVISIONS | MO5010553 | Unaddressed | Jul 2, 2025 |
| Consumer Confidence Rule | MO5048294 | Unaddressed | Jul 1, 2025 |
| Groundwater Rule | MO5048294 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| Groundwater Rule | MO5048294 | Resolved | Dec 1, 2024through Dec 31, 2024 |
| LEAD AND COPPER RULE REVISIONS | MO5048294 | Unaddressed | Oct 17, 2024 |
| Lead and Copper Rule | MO5010553 | Resolved | Oct 1, 2024through Jan 14, 2026 |
| Groundwater Rule | MO5048294 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| Lead and Copper Rule | MO5048294 | Unaddressed | Oct 1, 2024 |
| Public Notice | MO5048294 | Resolved | Sep 30, 2024through Jan 29, 2025 |
| Public Notice | MO5048294 | Resolved | Sep 30, 2024through Jan 29, 2025 |
| Public Notice | MO5048294 | Resolved | Aug 4, 2024through Jan 29, 2025 |
| Public Notice | MO5048294 | Resolved | Aug 4, 2024through Jan 29, 2025 |
| Groundwater Rule | MO5048294 | Resolved | Aug 1, 2024through Aug 31, 2024 |
| Public Notice | MO5048294 | Resolved | Jul 2, 2024through Jan 29, 2025 |
| Consumer Confidence Rule | MO5048294 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| Groundwater RuleHealth-based | MO5048294 | Resolved | Jul 1, 2024through Jul 31, 2024 |
| Public Notice | MO5048294 | Resolved | Jun 30, 2024through Jan 29, 2025 |
| Groundwater Rule | MO5048294 | Resolved | Jun 1, 2024through Jun 30, 2024 |
| Groundwater RuleHealth-based | MO5048294 | Resolved | May 1, 2024through May 31, 2024 |
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 Mount Vernon ZIP 65712 using 183 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
183 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 Mount Vernon
Is tap water safe in Mount Vernon?+
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 183 PPM, or 10.7 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 183 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.