Hardness
Very Hard
686.5 PPM · 40.1 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 Keith County.
At a glance
EPA quarter 2026Q2
Hardness
Very Hard
686.5 PPM · 40.1 GPG
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
6.5e-4 mg/L
4% of action level
Utility match
1 system
Serves 330 people system-wide
Hardness meter
Estimated local hardness
USGS hardness classification scale
686.5 PPM
Parts per million
686.5
mg/L as CaCO₃ equivalent
Grains per gallon
40.1
1 GPG ≈ 17.1 PPM
What this means at home
At 686.5 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
12
Nearest site
3.1 mi
Observation range
Sep 10, 2019–Jul 13, 2023
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: SB01304129CCD NAWQA 26 (Well).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.
Brule median
687 PPM
About the same1 indexed ZIP readings · Range 686.5–686.5 PPM
Nebraska median
309 PPM
378 PPM higher466 indexed ZIP readings · Range 72.3–1245 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)
6.5e-4 mg/L
Reported Dec 31, 2021
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 6.5e-4
EPA limit 0.015
100% line = listed limit
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | NE3110103 | Unaddressed | Feb 12, 2026 |
| Revised Total Coliform Rule | NE3110103 | Archived | Oct 1, 2025through Oct 31, 2025 |
| Lead and Copper Rule | NE3110103 | Resolved | Jan 1, 2024through Feb 21, 2025 |
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 Brule ZIP 69127 using 686.5 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
686.5 PPM is 6× 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 686.5 PPM, or 40.1 grains per gallon, classified as very hard. This is not a household tap measurement.
At 686.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.