Hardness
Very Hard
483 PPM · 28.2 GPG
Local water dashboard
Official source aggregationWater quality in Maysville, MO 64469
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Dekalb County.
3 reported benchmark flags
- Primary matched system
- Maysville Pws
- Source water
- Groundwater
- County
- Dekalb 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
0.0044 mg/L
29% of action level
Utility match
1 system
Serves 1,096 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
483 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
483
mg/L as CaCO₃ equivalent
Grains per gallon
28.2
1 GPG ≈ 17.1 PPM
What this means at home
At 483 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
66
Nearest site
22.7 mi
Observation range
Jan 18, 2017–May 12, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: T61N R27W 29BAA 16271 (Well).USGS source documentation ↗
Regional context
Is 64469 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Maysville median
483 PPM
About the same1 indexed ZIP readings · Range 483–483 PPM
Missouri median
236 PPM
247 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 pass3 fail
Lead (PB90)
0.0044 mg/L
Reported Dec 31, 2025
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
4 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0044
EPA limit 0.015
TTHM
Measured in UG/L
Local 115
EPA limit 0.08
Total Haloacetic Acids (HAA5)
Measured in UG/L
Local 105
EPA limit 0.06
Chlorite
Measured in MG/L
Local 1.2
EPA limit 1
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 23
- Health-based
- 15
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHMHealth-basedReported 115 UG/L · MCL 0.08 | MO1010510 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Total Haloacetic Acids (HAA5)Health-basedReported 105 UG/L · MCL 0.06 | MO1010510 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Surface Water Treatment Rule | MO1010510 | Resolved | Nov 1, 2025through Nov 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | MO1010510 | Resolved | Nov 1, 2025through Nov 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | MO1010510 | Resolved | Nov 1, 2025through Nov 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 96.9 UG/L · MCL 0.06 | MO1010510 | Archived | Oct 1, 2025through Dec 31, 2025 |
| TTHMHealth-basedReported 114.4 UG/L · MCL 0.08 | MO1010510 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Lead and Copper Rule | MO1010510 | Unaddressed | Aug 19, 2025 |
| Interim Enhanced Surface Water Treatment Rule | MO1010510 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 78.15 UG/L · MCL 0.06 | MO1010510 | Archived | Jul 1, 2025through Sep 30, 2025 |
| TTHMHealth-basedReported 104.88 UG/L · MCL 0.08 | MO1010510 | Archived | Jul 1, 2025through Sep 30, 2025 |
| Surface Water Treatment Rule | MO1010510 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Interim Enhanced Surface Water Treatment Rule | MO1010510 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | MO1010510 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Revised Total Coliform Rule | MO1010510 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | MO1010510 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | MO1010510 | Resolved | Sep 1, 2024through Sep 30, 2024 |
| Surface Water Treatment RuleHealth-based | MO1010510 | Resolved | Sep 1, 2024through Sep 30, 2024 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | MO1010510 | Resolved | Sep 1, 2024through Sep 30, 2024 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | MO1010510 | Resolved | Aug 1, 2024through Aug 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 Maysville ZIP 64469 using 483 PPM nearby hardness and 4 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
483 PPM is 4× 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
TTHM, Total Haloacetic Acids (HAA5), Chlorite have 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 Maysville
Is tap water safe in Maysville?+
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 483 PPM, or 28.2 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 483 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.