Hardness
Very Hard
291 PPM · 17 GPG
Local water dashboard
Official source aggregationWater quality in Kendall, WI 54638
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Monroe County.
1 active health-based violation
- Primary matched system
- Kendall Waterworks
- Source water
- Groundwater
- County
- Monroe 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
0.0024 mg/L
16% of action level
Utility match
1 system
Serves 458 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
291 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
291
mg/L as CaCO₃ equivalent
Grains per gallon
17
1 GPG ≈ 17.1 PPM
What this means at home
At 291 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
23
Nearest site
39.5 mi
Observation range
Aug 2, 2016–Aug 20, 2024
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: AD-15/07E/24-0407 (Well).USGS source documentation ↗
Regional context
Is 54638 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Kendall median
291 PPM
About the same1 indexed ZIP readings · Range 291–291 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)
0.0024 mg/L
Reported Dec 31, 2025
Copper (CU90)
1.3855 mg/L
Reported Sep 30, 2023
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0024
EPA limit 0.015
Copper (90th percentile)
Measured in mg/L
Local 1.3855
EPA limit 1.3
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 12
- Health-based
- 3
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Lead and Copper Rule | WI6420295 | Unaddressed | Oct 1, 2025 |
| Lead and Copper RuleHealth-based | WI6420295 | Resolved | Dec 11, 2024through Apr 30, 2025 |
| Public Notice | WI6420295 | Resolved | Dec 11, 2024through Jun 14, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | WI6420295 | Unaddressed | Oct 17, 2024 |
| Public Notice | WI6420295 | Unaddressed | Oct 17, 2024 |
| Nitrate | WI6420295 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Nitrate | WI6420295 | Resolved | Jul 1, 2024through Sep 30, 2024 |
| Nitrate | WI6420295 | Resolved | Jan 1, 2024through Mar 31, 2024 |
| Lead and Copper RuleHealth-based | WI6420295 | Resolved | Oct 1, 2023through Dec 22, 2023 |
| Lead and Copper Rule | WI6420295 | Resolved | Jul 1, 2023through Nov 30, 2023 |
| Lead and Copper Rule | WI6420295 | Resolved | Jun 1, 2023through Nov 30, 2023 |
| Revised Total Coliform Rule | WI6420295 | Resolved | Aug 1, 2021through Aug 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 Kendall ZIP 54638 using 291 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
291 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), LEAD AND COPPER RULE REVISIONS 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 Kendall
Is tap water safe in Kendall?+
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 291 PPM, or 17 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 291 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.