Hardness
Hard
178 PPM · 10.4 GPG
Local water dashboard
Official source aggregationA source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Linn County.
At a glance
EPA quarter 2026Q2
Hardness
Hard
178 PPM · 10.4 GPG
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0 mg/L
0% of action level
Utility match
1 system
Serves 345 people system-wide
Hardness meter
Estimated local hardness
USGS hardness classification scale
178 PPM
Parts per million
178
mg/L as CaCO₃ equivalent
Grains per gallon
10.4
1 GPG ≈ 17.1 PPM
What this means at home
At 178 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
16
Nearest site
8.7 mi
Observation range
Jan 11, 2016–May 13, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Locust Creek near Linneus, MO (Stream).USGS source documentation ↗
Regional context
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Laclede median
178 PPM
About the same1 indexed ZIP readings · Range 178–178 PPM
Missouri median
236 PPM
58 PPM lower556 indexed ZIP readings · Range 38.3–483 PPM
EPA benchmark screen
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
Lead (PB90)
0 mg/L
Reported Dec 31, 2023
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.
Measured in mg/L
Local 0
EPA limit 0.015
100% line = listed limit
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | MO2010437 | Resolved | Oct 17, 2024through May 7, 2025 |
| Public Notice | MO2010437 | Resolved | Nov 15, 2023through Jan 8, 2024 |
| Public Notice | MO2010437 | Resolved | Nov 1, 2023through Jan 8, 2024 |
| Consumer Confidence Rule | MO2010437 | Resolved | Jul 1, 2023through Dec 4, 2023 |
| Lead and Copper Rule | MO2010437 | Resolved | Nov 1, 2022through Nov 6, 2023 |
| Revised Total Coliform Rule | MO2010437 | Resolved | Sep 1, 2022through Sep 30, 2022 |
| TTHM | MO2010437 | Resolved | Jul 1, 2022through Sep 30, 2022 |
| Total Haloacetic Acids (HAA5) | MO2010437 | Resolved | Jul 1, 2022through Sep 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
Matched to Laclede ZIP 64651 using 178 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
178 PPM is 1× 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
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.
Nearby USGS observations produce an estimate of 178 PPM, or 10.4 grains per gallon, classified as hard. This is not a household tap measurement.
At 178 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.