Addison Water Hardness & Quality Report (2026)
Water Hardness
12.6 grains per gallon
Source
river
pH Level
8.3
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
484.9 mg/L
Est. Daily Cost
$0.57
energy & soap waste
Source: USGS Water Quality Portal · 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 Addison, your appliances are currently losing 29% efficiency due to mineral buildup.
| Appliance | In Addison | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.5 yrs | 8.5 yrs | -71% |
| Washing Machine | 5.6 yrs | 12 yrs | -53% |
| Water Heater | 7 yrs | 15 yrs | -53% |
Regional Water Comparison
How Addison compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Addison, Illinois | 215.5 mg/L | 7.5 ppt | 🔴 Very Hard | river |
| Wood Dale, Illinois | 252 mg/L | 8.8 ppt | 🔴 Very Hard | river |
| Villa Park, Illinois | 283.5 mg/L | 9.8 ppt | 🔴 Very Hard | river |
| Bensenville, Illinois | 144.5 mg/L | 5.1 ppt | 🟠 Hard | river |
| Lombard, Illinois | 172 mg/L | 6.1 ppt | 🟠 Hard | river |
National Benchmark
How Addison compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Addison | 215.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Addison's Water Unique?
Local geology and source profile
Addison, Illinois, in DuPage County — a major west Chicago suburban community along Lake Street (US-20) in DuPage County, adjacent to Villa Park and Elmhurst in the inner west DuPage County corridor, home of the Addison Trail High School and a significant manufacturing base in DuPage County, a diverse Chicago suburb with a significant Latino-American, Polish-American, and Indian-American population, and a west suburban community in the rapidly urbanizing DuPage County corridor — draws its municipal water supply from a mix of Silurian dolomite wells and Lake Michigan import via the Village of Addison Water Division. Water hardness in Addison measures 215.5 mg/L — classified as very hard.
Addison's very hard supply reflects the DuPage County Silurian Niagara Dolomite aquifer's highly calcareous character. The Silurian Niagaran Dolomite at Addison–DuPage County (the Lockport Dolomite equivalent in northeast Illinois) is a highly calcareous dolomite bedrock that dominates the DuPage County subsurface. The mix of deep dolomite wells and Lake Michigan supply in the Addison distribution zone produces the very hard 215.5 mg/L — harder than pure Lake Michigan supply (~130 mg/L) due to the high-hardness dolomite well contribution.
At 215.5 mg/L, Addison residents face severe hard water challenges. Weekly descaling and appliance protection measures are strongly recommended. Village of Addison Water Division consistently delivers water meeting all Illinois EPA and federal EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Silurian Niagara Dolomite Aquifer and Lake Michigan import via the Village of Addison Water Division — the DuPage County northwest Chicago suburban corridor (Silurian Niagara Dolomite — the highly calcareous northeast Illinois dolomite; mixed DuPage County dolomite wells and Lake Michigan supply zone); very hard supply at 215.5 mg/L in DuPage County.