Hardness
Very Hard
289.5 PPM · 16.9 GPG
Local water dashboard
Official source aggregationWater quality in Big Lake, MO 64437
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Holt County.
1 reported benchmark flag
- Primary matched system
- Big Lake Village Of Pws
- Source water
- Groundwater
- County
- Holt 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 mg/L
0% of action level
Utility match
1 system
Serves 2,000 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
289.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
289.5
mg/L as CaCO₃ equivalent
Grains per gallon
16.9
1 GPG ≈ 17.1 PPM
What this means at home
At 289.5 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
14
Nearest site
27 mi
Observation range
Oct 5, 2016–Jun 4, 2025
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 4N 14E 15DD (N-6) (Well).USGS source documentation ↗
Regional context
Is 64437 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Big Lake median
290 PPM
About the same1 indexed ZIP readings · Range 289.5–289.5 PPM
Missouri median
236 PPM
54 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 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
EPA limit 0.015
TTHM
Measured in UG/L
Local 82
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 3
- Health-based
- 1
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | MO1011182 | Unaddressed | Jul 2, 2025 |
| Lead and Copper Rule | MO1011182 | Resolved | Oct 1, 2024through Mar 31, 2025 |
| TTHMHealth-basedReported 82 UG/L · MCL 0.08 | MO1011182 | Resolved | Jul 1, 2024through Sep 30, 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 Big Lake ZIP 64437 using 289.5 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
289.5 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
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 Big Lake
Is tap water safe in Big Lake?+
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 289.5 PPM, or 16.9 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 289.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.