Hardness
Very Hard
347 PPM · 20.3 GPG
Local water dashboard
Official source aggregationWater quality in Arrow Rock, MO 65320
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Saline County.
1 reported benchmark flag
- Primary matched system
- Arrow Rock Pws
- Source water
- Groundwater
- County
- Saline 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
0.0017 mg/L
11% of action level
Utility match
1 system
Serves 235 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
347 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
347
mg/L as CaCO₃ equivalent
Grains per gallon
20.3
1 GPG ≈ 17.1 PPM
What this means at home
At 347 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
21
Nearest site
13.5 mi
Observation range
Apr 11, 2016–Apr 9, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: T47N R18W 05AAC1 (Well).USGS source documentation ↗
Regional context
Is 65320 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Arrow Rock median
347 PPM
About the same1 indexed ZIP readings · Range 347–347 PPM
Missouri median
236 PPM
111 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 pass1 fail
Lead (PB90)
0.0017 mg/L
Reported Dec 31, 2025
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 0.0017
EPA limit 0.015
TTHM
Measured in UG/L
Local 88
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 15
- Health-based
- 4
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| TTHMHealth-basedReported 88 UG/L · MCL 0.08 | MO2010029 | Archived | Jan 1, 2026through Mar 31, 2026 |
| TTHMHealth-basedReported 88.1 UG/L · MCL 0.08 | MO2010029 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Public Notice | MO2010029 | Resolved | Jul 3, 2025through Nov 18, 2025 |
| LEAD AND COPPER RULE REVISIONS | MO2010029 | Unaddressed | Jul 2, 2025 |
| TTHMHealth-basedReported 85.68 UG/L · MCL 0.08 | MO2010029 | Archived | Jul 1, 2025through Sep 30, 2025 |
| Revised Total Coliform Rule | MO2010029 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| TTHMHealth-basedReported 81 UG/L · MCL 0.08 | MO2010029 | Resolved | Jan 1, 2025through Mar 31, 2025 |
| Revised Total Coliform Rule | MO2010029 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Total Haloacetic Acids (HAA5) | MO2010029 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| TTHM | MO2010029 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| TTHM | MO2010029 | Resolved | Jan 1, 2023through Mar 31, 2023 |
| Total Haloacetic Acids (HAA5) | MO2010029 | Resolved | Jan 1, 2023through Mar 31, 2023 |
| Total Haloacetic Acids (HAA5) | MO2010029 | Resolved | Oct 1, 2022through Dec 31, 2022 |
| TTHM | MO2010029 | Resolved | Oct 1, 2022through Dec 31, 2022 |
| Revised Total Coliform Rule | MO2010029 | Resolved | Jun 1, 2021through Jun 30, 2021 |
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 Arrow Rock ZIP 65320 using 347 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
347 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 systemsDrinking water protection
Under-Sink Reverse Osmosis System
TTHM 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 Arrow Rock
Is tap water safe in Arrow Rock?+
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 347 PPM, or 20.3 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 347 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.