Hardness
Very Hard
475 PPM · 27.8 GPG
Local water dashboard
Official source aggregationWater quality in Henry, SD 57243
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Codington County.
1 active health-based violation
- Primary matched system
- Henry
- Source water
- Groundwater
- County
- Codington County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
1 active health-based record
Lead 90th percentile
0.001 mg/L
7% of action level
Utility match
1 system
Serves 256 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
475 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
475
mg/L as CaCO₃ equivalent
Grains per gallon
27.8
1 GPG ≈ 17.1 PPM
What this means at home
At 475 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
4
Nearest site
48.9 mi
Observation range
May 23, 2016–May 1, 2024
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: 115N047W03BAC (Gary obs well) (Well).USGS source documentation ↗
Regional context
Is 57243 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Henry median
475 PPM
About the same1 indexed ZIP readings · Range 475–475 PPM
South Dakota median
516 PPM
41 PPM lower234 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)
0.001 mg/L
Reported Dec 31, 2025
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 0.001
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 19
- Health-based
- 1
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Chlorine | SD4600153 | Archived | Jul 1, 2025through Sep 30, 2025 |
| Stage 1 Disinfectants and Disinfection Byproducts RuleHealth-based | SD4600153 | Unaddressed | May 15, 2025 |
| Revised Total Coliform Rule | SD4600153 | Resolved | May 1, 2025through May 31, 2025 |
| Chlorine | SD4600153 | Archived | Apr 1, 2025through Jun 30, 2025 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Apr 1, 2025through Apr 30, 2025 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Mar 1, 2025through Mar 31, 2025 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Feb 1, 2025through Feb 28, 2025 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Jan 1, 2025through Jan 31, 2025 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Dec 1, 2024through Dec 31, 2024 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| Lead and Copper Rule | SD4600153 | Resolved | Oct 1, 2024through Sep 30, 2025 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Aug 1, 2024through Aug 31, 2024 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Jun 1, 2024through Jun 30, 2024 |
| Chlorine | SD4600153 | Resolved | Apr 1, 2024through Jun 30, 2024 |
| Chlorine | SD4600153 | Resolved | Jan 1, 2024through Mar 31, 2024 |
| Lead and Copper Rule | SD4600153 | Resolved | Oct 1, 2023through Sep 30, 2025 |
| Revised Total Coliform Rule | SD4600153 | Resolved | Oct 1, 2023through Oct 31, 2023 |
| Chlorine | SD4600153 | Resolved | Jul 1, 2023through Sep 30, 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 Henry ZIP 57243 using 475 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
475 PPM is 4× 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
Stage 1 Disinfectants and Disinfection Byproducts Rule 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 Henry
Is tap water safe in Henry?+
EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
How hard is the water?+
Nearby USGS observations produce an estimate of 475 PPM, or 27.8 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 475 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.