Hardness
Very Hard
283.5 PPM · 16.6 GPG
Local water dashboard
Official source aggregationWater quality in Spring Green, WI 53588
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Sauk County.
1 active health-based violation
- Primary matched system
- Spring Green Waterworks
- Source water
- Groundwater
- County
- Sauk 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
7.2e-4 mg/L
5% of action level
Utility match
5 systems
Serves 1,626 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
283.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
283.5
mg/L as CaCO₃ equivalent
Grains per gallon
16.6
1 GPG ≈ 17.1 PPM
What this means at home
At 283.5 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
16
Nearest site
0.6 mi
Observation range
Aug 3, 2016–Aug 20, 2024
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: SK-08/04E/07-1934 (Well).USGS source documentation ↗
Regional context
Is 53588 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Spring Green median
284 PPM
About the same1 indexed ZIP readings · Range 283.5–283.5 PPM
Wisconsin median
288 PPM
About the same556 indexed ZIP readings · Range 41.3–467 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)
7.2e-4 mg/L
Reported Dec 31, 2025
Copper (CU90)
12.825 mg/L
Reported Jun 30, 1994
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 7.2e-4
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 12.825
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 9
- Health-based
- 2
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Groundwater RuleHealth-based | WI1571282 | Unaddressed | Dec 2, 2025 |
| Radium-228 | WI1571284 | Archived | Mar 1, 2025through Jun 30, 2025 |
| Combined Radium (-226 and -228) | WI1571284 | Archived | Mar 1, 2025through Jun 30, 2025 |
| Consumer Confidence Rule | WI1571284 | Resolved | Jul 1, 2024through Apr 28, 2025 |
| Consumer Confidence Rule | WI1571284 | Resolved | Jul 1, 2024through Apr 28, 2025 |
| Stage 1 Disinfectants and Disinfection Byproducts RuleHealth-based | WI1250318 | Resolved | Apr 2, 2024through Apr 3, 2024 |
| Lead and Copper Rule | WI1571282 | Resolved | Jul 1, 2022through Jul 12, 2024 |
| Lead and Copper Rule | WI1570110 | Resolved | Jan 1, 2022through Feb 23, 2022 |
| Revised Total Coliform Rule | WI1250318 | Resolved | Jan 1, 2021through Jan 31, 2021 |
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 Spring Green ZIP 53588 using 283.5 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
283.5 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
Copper (90th percentile), Groundwater Rule have 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 Spring Green
Is tap water safe in Spring Green?+
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 283.5 PPM, or 16.6 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 283.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.