Hardness
Very Hard
192 PPM · 11.2 GPG
Local water dashboard
Official source aggregationWater quality in Maryville, MO 64468
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Nodaway County.
1 reported benchmark flag
- Primary matched system
- Maryville Pws
- Source water
- Surface water + Groundwater
- County
- Nodaway 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
0.0061 mg/L
40% of action level
Utility match
3 systems
Serves 10,775 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
192 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
192
mg/L as CaCO₃ equivalent
Grains per gallon
11.2
1 GPG ≈ 17.1 PPM
What this means at home
At 192 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
7
Nearest site
13.9 mi
Observation range
Jan 27, 2016–May 11, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Nodaway River near Graham, MO (Stream).USGS source documentation ↗
Regional context
Is 64468 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Maryville median
192 PPM
About the same1 indexed ZIP readings · Range 192–192 PPM
Missouri median
236 PPM
44 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 pass1 fail
Lead (PB90)
0.0061 mg/L
Reported Dec 31, 2024
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0061
EPA limit 0.015
Chlorite
Measured in MG/L
Local 1.1
EPA limit 1
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 13
- Health-based
- 4
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | MO1010508 | Resolved | Feb 26, 2026through Feb 27, 2026 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | MO1010508 | Archived | Dec 1, 2025through Dec 31, 2025 |
| Public Notice | MO1010508 | Resolved | Apr 22, 2024through Apr 26, 2024 |
| Public Notice | MO1010508 | Resolved | Apr 22, 2024through Apr 26, 2024 |
| ChloriteHealth-basedReported 1.1 MG/L · MCL 1 | MO1010508 | Resolved | Mar 1, 2024through Mar 31, 2024 |
| Chlorite | MO1010508 | Resolved | Mar 1, 2024through Mar 31, 2024 |
| ChloriteHealth-basedReported 1.3 MG/L · MCL 1 | MO1010508 | Resolved | Feb 1, 2024through Feb 29, 2024 |
| Chlorite | MO1010508 | Resolved | Feb 1, 2024through Feb 29, 2024 |
| Chlorine dioxide | MO1010508 | Resolved | Feb 1, 2024through Feb 29, 2024 |
| Chlorite | MO1010508 | Resolved | Nov 1, 2023through Nov 30, 2023 |
| Public Notice | MO1010508 | Resolved | Mar 6, 2023through Apr 25, 2023 |
| Long Term 2 Enhanced Surface Water Treatment RuleHealth-based | MO1010508 | Resolved | Dec 27, 2022through Feb 14, 2023 |
| Groundwater Rule | MO1010508 | Resolved | Aug 27, 2022through Nov 8, 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 Maryville ZIP 64468 using 192 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
192 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 systemsDrinking water protection
Under-Sink Reverse Osmosis System
Chlorite 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 Maryville
Is tap water safe in Maryville?+
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 192 PPM, or 11.2 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 192 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.