Hardness
Very Hard
301 PPM · 17.6 GPG
Local water dashboard
Official source aggregationWater quality in Oketo, KS 66518
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Marshall County.
1 reported benchmark flag
- Primary matched system
- Oketo, City Of
- Source water
- Groundwater
- County
- Marshall 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
6.0e-4 mg/L
4% of action level
Utility match
1 system
Serves 65 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
301 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
301
mg/L as CaCO₃ equivalent
Grains per gallon
17.6
1 GPG ≈ 17.1 PPM
What this means at home
At 301 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
32
Nearest site
28.5 mi
Observation range
Oct 5, 2016–Sep 8, 2025
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: NEMAHA COUNTY RWD3 WELL 5 (Well).USGS source documentation ↗
Regional context
Is 66518 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Oketo median
301 PPM
About the same1 indexed ZIP readings · Range 301–301 PPM
Kansas median
289 PPM
12 PPM higher540 indexed ZIP readings · Range 72.2–707 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)
6.0e-4 mg/L
Reported Dec 31, 2023
Copper (CU90)
1.5 mg/L
Reported Dec 31, 2014
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 6.0e-4
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.5
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 7
- Health-based
- 3
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Groundwater RuleHealth-based | KS2011704 | Resolved | Dec 18, 2024through Dec 11, 2025 |
| Groundwater RuleHealth-based | KS2011704 | Resolved | Dec 18, 2024through Dec 11, 2025 |
| Groundwater RuleHealth-based | KS2011704 | Resolved | Dec 18, 2024through Dec 11, 2025 |
| LEAD AND COPPER RULE REVISIONS | KS2011704 | Resolved | Oct 17, 2024through Apr 8, 2025 |
| Groundwater Rule | KS2011704 | Resolved | Sep 19, 2024through Dec 11, 2025 |
| Consumer Confidence Rule | KS2011704 | Unaddressed | Oct 2, 2023 |
| Consumer Confidence Rule | KS2011704 | Unaddressed | Jul 1, 2023 |
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 Oketo ZIP 66518 using 301 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
301 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
Copper (90th percentile) 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 Oketo
Is tap water safe in Oketo?+
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 301 PPM, or 17.6 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 301 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.