Hardness
Very Hard
556.5 PPM · 32.5 GPG
Local water dashboard
Official source aggregationWater quality in Nisland, SD 57762
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Butte County.
No active health-based violation reported
- Primary matched system
- Nisland
- Source water
- Groundwater
- County
- Butte 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
0.003 mg/L
20% of action level
Utility match
1 system
Serves 206 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
556.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
556.5
mg/L as CaCO₃ equivalent
Grains per gallon
32.5
1 GPG ≈ 17.1 PPM
What this means at home
At 556.5 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
20
Nearest site
49.7 mi
Observation range
May 9, 2016–Nov 20, 2024
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 002N08E14ADDD2 (MW930412) (Well).USGS source documentation ↗
Regional context
Is 57762 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Nisland median
557 PPM
About the same1 indexed ZIP readings · Range 556.5–556.5 PPM
South Dakota median
516 PPM
41 PPM higher234 indexed ZIP readings · Range 20.5–1330 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 pass
Lead (PB90)
0.003 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.
Lead (90th percentile)
Measured in mg/L
Local 0.003
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 11
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Revised Total Coliform Rule | SD4600225 | Archived | Feb 1, 2026through Feb 28, 2026 |
| Revised Total Coliform Rule | SD4600225 | Archived | Jan 1, 2026through Jan 31, 2026 |
| Chlorine | SD4600225 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Public Notice | SD4600225 | Unaddressed | Oct 6, 2024 |
| Revised Total Coliform Rule | SD4600225 | Resolved | Sep 1, 2024through Sep 30, 2024 |
| Revised Total Coliform Rule | SD4600225 | Resolved | Aug 1, 2024through Aug 31, 2024 |
| Revised Total Coliform Rule | SD4600225 | Resolved | Jul 1, 2024through Jul 31, 2024 |
| Revised Total Coliform Rule | SD4600225 | Resolved | Jun 1, 2024through Jun 30, 2024 |
| Chlorine | SD4600225 | Resolved | Apr 1, 2024through Jun 30, 2024 |
| Revised Total Coliform Rule | SD4600225 | Resolved | Dec 1, 2023through Dec 31, 2023 |
| Revised Total Coliform Rule | SD4600225 | Resolved | Oct 1, 2023through Oct 31, 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 Nisland ZIP 57762 using 556.5 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
556.5 PPM is 5× 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
Water questions for Nisland
Is tap water safe in Nisland?+
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 556.5 PPM, or 32.5 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 556.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.