Hardness
Very Hard
331.5 PPM · 19.4 GPG
Local water dashboard
Official source aggregationWater quality in Pepin, WI 54759
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Pepin County.
1 active health-based violation
- Primary matched system
- Pepin Waterworks
- Source water
- Groundwater
- County
- Pepin 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
0.0053 mg/L
36% of action level
Utility match
1 system
Serves 816 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
331.5 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
331.5
mg/L as CaCO₃ equivalent
Grains per gallon
19.4
1 GPG ≈ 17.1 PPM
What this means at home
At 331.5 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
56
Nearest site
11.6 mi
Observation range
Jul 12, 2016–Sep 10, 2024
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: PDCT-U7 024N16W09AA 01 (Well).USGS source documentation ↗
Regional context
Is 54759 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Pepin median
332 PPM
About the same1 indexed ZIP readings · Range 331.5–331.5 PPM
Wisconsin median
288 PPM
44 PPM higher556 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 pass
Lead (PB90)
0.0053 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.
Lead (90th percentile)
Measured in mg/L
Local 0.0053
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 15
- Health-based
- 6
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper RuleHealth-based | WI6470141 | Unaddressed | Oct 3, 2025 |
| Stage 1 Disinfectants and Disinfection Byproducts RuleHealth-based | WI6470141 | Resolved | Aug 2, 2025through Sep 15, 2025 |
| Revised Total Coliform Rule | WI6470141 | Resolved | Aug 1, 2025through Aug 31, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | WI6470141 | Resolved | Oct 17, 2024through Nov 4, 2024 |
| Public Notice | WI6470141 | Unaddressed | Oct 17, 2024 |
| LEAD AND COPPER RULE REVISIONS | WI6470141 | Resolved | Oct 17, 2024through Nov 4, 2024 |
| Public Notice | WI6470141 | Unaddressed | Oct 17, 2024 |
| Stage 1 Disinfectants and Disinfection Byproducts RuleHealth-based | WI6470141 | Resolved | May 2, 2024through May 6, 2024 |
| Lead and Copper RuleHealth-based | WI6470141 | Resolved | Feb 1, 2023through Oct 3, 2023 |
| Lead and Copper Rule | WI6470141 | Resolved | Oct 1, 2021through Oct 8, 2021 |
| Consumer Confidence Rule | WI6470141 | Resolved | Jul 1, 2021through Jun 30, 2022 |
| Consumer Confidence Rule | WI6470141 | Resolved | Jul 1, 2021through Jun 30, 2022 |
| Stage 1 Disinfectants and Disinfection Byproducts RuleHealth-based | WI6470141 | Resolved | May 2, 2021through May 3, 2021 |
| Public Notice | WI6470141 | Resolved | May 1, 2021through Jun 14, 2022 |
| Lead and Copper Rule | WI6470141 | Resolved | Feb 1, 2021through Feb 3, 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 Pepin ZIP 54759 using 331.5 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
331.5 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
Lead and Copper 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 Pepin
Is tap water safe in Pepin?+
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 331.5 PPM, or 19.4 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 331.5 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.