Streamwood Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
river
pH Level
7.7
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
220.4 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 Streamwood, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Streamwood | 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 Streamwood compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Streamwood, Illinois | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | river |
| Bartlett, Illinois | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | river |
| Hanover Park, Illinois | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | river |
| Schaumburg, Illinois | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | river |
| Hoffman Estates, Illinois | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | river |
National Benchmark
How Streamwood compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Streamwood | ≈ 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 Streamwood's Water Unique?
Local geology and source profile
The Village of Streamwood Water Department serves approximately 39,858 residents in Streamwood, Illinois, within Cook County. Water is purchased from the Northwest Suburban Municipal Joint Action Water Agency (JAWA), sourced from Lake Michigan and treated at the Jardine Water Plant in Chicago. JAWA operates a high-service pumping station in Streamwood. No local treatment or wells are used; disinfectants include chloramines and hypochlorite. Orthophosphate use began December 2024 to reduce lead per Illinois EPA advice, and water meets federal and state standards overall.
The supply originates from the Lake Michigan watershed, spanning multiple states with drainage over glacial deposits and Paleozoic bedrock including Silurian reef dolomites and limestones of the Michigan Basin. Lake Michigan itself was formed by glacial scouring during the Pleistocene epoch. These formations release calcium and magnesium, yielding moderately mineralised water characteristic of the basin's geology. Seasonal runoff from limestone-rich catchment soils shapes the mineral profile without deep aquifer influences.
Moderately hard water promotes scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan while causing dry skin and poor lathering. Regular descaling, vinegar rinses, and professional inspections help mitigate issues. A water softener is recommended to protect plumbing and appliances from mineral accumulation. Two contaminants exceeded EPA health guidelines (MCLGs) per reports; temporary discoloration is possible but safe for drinking. Contact Village of Streamwood Public Works at 630-736-3850 for the latest Consumer Confidence Report.
Geology & Source: Lake Michigan, glacially scoured Pleistocene reservoir; Paleozoic Silurian dolomite and limestone of the Michigan Basin underlie the lakebed; glacial till and carbonate catchment soils release calcium and magnesium, yielding moderately hard water
Other Illinois Water Reports
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Frequently Asked Questions
Is Streamwood's water safe to drink?
Do I need a water softener in Streamwood?
How does Streamwood compare to the USA average?
Data Sources & Methodology
Water quality data for Streamwood 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.