Hardness
Very Hard
320 PPM · 18.7 GPG
Local water dashboard
Official source aggregationWater quality in Hudson, WI 54016
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for St. Croix County.
No active health-based violation reported
- Primary matched system
- Hudson Waterworks
- Source water
- Groundwater
- County
- St. Croix 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
2 systems
Serves 18,558 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
320 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
320
mg/L as CaCO₃ equivalent
Grains per gallon
18.7
1 GPG ≈ 17.1 PPM
What this means at home
At 320 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
86
Nearest site
6.8 mi
Observation range
Jul 11, 2016–Aug 30, 2018
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: PDCJ-U14 029N20W20BDAABC01 W817 0000199550 (Well).USGS source documentation ↗
Regional context
Is 54016 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Hudson median
320 PPM
About the same1 indexed ZIP readings · Range 320–320 PPM
Wisconsin median
288 PPM
32 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)
0.003 mg/L
Reported Sep 30, 2024
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
- 9
- Health-based
- 1
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Nitrate | WI6560125 | Resolved | Jan 1, 2025through Mar 31, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | WI6560087 | Resolved | Oct 17, 2024through Jun 9, 2025 |
| Public Notice | WI6560087 | Unaddressed | Oct 17, 2024 |
| Nitrate | WI6560125 | Resolved | Apr 1, 2024through Jun 30, 2024 |
| Antimony, Total | WI6560125 | Resolved | Apr 1, 2024through Jun 30, 2024 |
| Lead and Copper Rule | WI6560087 | Resolved | Jan 1, 2024through Jan 5, 2024 |
| Lead and Copper Rule | WI6560125 | Resolved | Jan 1, 2022through Jan 12, 2022 |
| Consumer Confidence Rule | WI6560125 | Resolved | Jul 1, 2021through Jul 15, 2021 |
| Consumer Confidence Rule | WI6560125 | Resolved | Jul 1, 2021through Jul 15, 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 Hudson ZIP 54016 using 320 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
320 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 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 Hudson
Is tap water safe in Hudson?+
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 320 PPM, or 18.7 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 320 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.