Middleton Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
groundwater
pH Level
7
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
96 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Middleton, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Middleton | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Middleton compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Middleton, Wisconsin | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | groundwater |
| Madison, Wisconsin | ≈ 180+ mg/L | 2 ppt | 🔴 Very Hard | groundwater |
| Waunakee, Wisconsin | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | groundwater |
| Verona, Wisconsin | 340.4 mg/L | 10.1 ppt | 🔴 Very Hard | groundwater |
| Fitchburg, Wisconsin | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | groundwater |
National Benchmark
How Middleton compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Middleton | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Middleton's Water Unique?
Local geology and source profile
The City of Middleton Water & Sewer Utility serves approximately 18,203 residents in Middleton, Wisconsin, within Dane County. Water is sourced exclusively from six deep sandstone wells tapping groundwater aquifers, with no surface water components. The utility maintains roughly 160 miles of water mains from its facility at 7426 Hubbard Avenue. Annual Water Quality Reports are accessible at cityofmiddleton.us/877/Water-Quality-Reports; the utility can be reached at (608) 821-8350. No named treatment plants are specified for this groundwater-only supply.
Middleton's groundwater originates from the Cambrian-Ordovician aquifer system underlying south-central Wisconsin, specifically the Franconia sandstone formation accessed by wells 330–856 ft deep. This aquifer lies within the broader Upper Midwest Carbonate-Sandstone Aquifer System, where water percolates through fractured sandstone and interbedded limestone layers over Dane County's glacial till landscape. Dissolution of carbonate minerals like calcite and dolomite from the Mount Simon and Eau Claire Formations enriches the groundwater with alkaline earth metals, imparting a hard supply character.
In a hard water supply, mineral scale builds up gradually in pipes, water heaters, dishwashers, and washing machines, reducing efficiency by up to 20–30% over time. Faucet aerators and showerheads clog noticeably, and laundry requires more detergent while leaving spots on glassware. Regular vinegar descaling, annual appliance inspections, and scale-inhibiting filters are recommended. A whole-home water softener is advised for prolonged hard water exposure to extend appliance life. Middleton's tap water meets EPA legal limits but exceeds health-based MCLGs for 3 contaminants, including trichloroacetic acid, N-nitrosodi-n-butylamine, and barium; PFAS concerns were also noted in 2026 analyses.
Geology & Source: Cambrian Franconia Formation sandstone aquifer — six wells 330–856 ft deep; overlying Mount Simon and Eau Claire limestone/dolomite strata impart dissolved calcium and magnesium — hard water
Other Wisconsin Water Reports
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Frequently Asked Questions
Is Middleton's water safe to drink?
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How does Middleton compare to the USA average?
Data Sources & Methodology
Water quality data for Middleton is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.