Plainfield Water Hardness & Quality Report (2026)
Water Hardness
12.5 grains per gallon
Source
river
pH Level
8.3
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
479.8 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 Plainfield, your appliances are currently losing 29% efficiency due to mineral buildup.
| Appliance | In Plainfield | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.5 yrs | 8.5 yrs | -71% |
| Washing Machine | 5.7 yrs | 12 yrs | -53% |
| Water Heater | 7 yrs | 15 yrs | -53% |
Regional Water Comparison
How Plainfield compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Plainfield, Illinois | 214 mg/L | 7.5 ppt | 🔴 Very Hard | river |
| Shorewood, Illinois | 223.5 mg/L | 7.8 ppt | 🔴 Very Hard | river |
| Romeoville, Illinois | 168.5 mg/L | 6 ppt | 🟠 Hard | river |
| Crest Hill, Illinois | 104 mg/L | 3.8 ppt | 🟡 Moderately Hard | river |
| Lockport, Illinois | 166 mg/L | 5.9 ppt | 🟠 Hard | river |
National Benchmark
How Plainfield compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Plainfield | 214 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Plainfield's Water Unique?
Local geology and source profile
Plainfield, Illinois, in Will County southwest of Chicago — one of the fastest-growing communities in the Chicago metro area (a major southwest suburban Will County exurban community), a historic Illinois community rebuilt after the devastating 1990 Plainfield tornado (one of the deadliest F5 tornadoes in Illinois history, killing 29 people), and a major Will County residential community in the Chicago southwest suburban growth corridor — draws its municipal water supply from the Silurian Dolomite Aquifer and DCWC Lake Michigan supply via the Village of Plainfield Water Division. Water hardness in Plainfield measures 214 mg/L — classified as hard.
Plainfield's hard supply reflects the southwest Will County Silurian dolomite geology. The Silurian Niagara Dolomite in Will County is the same highly calcareous dolomite formation that underlies Niagara Falls — one of the most calcareous Silurian carbonate formations in the US Midwest. The Wisconsin Age calcareous glacial till from the Lake Michigan Lobe overlying the Plainfield zone consists of calcareous till derived from the Michigan Basin dolomite terrain. The deep Silurian dolomite aquifer in the Will County zone produces the hard 214 mg/L at Plainfield.
At 214 mg/L, Plainfield residents face regular hard water challenges. Scale deposits form on faucet aerators, showerheads, and appliances within weeks — monthly descaling with citric acid solution is standard maintenance. Village of Plainfield Water Division consistently delivers water meeting all Illinois EPA and federal EPA Safe Drinking Water Act requirements.
Geology & Source: Groundwater from the Silurian Dolomite Aquifer and Lake Michigan via DuPage County Water Commission (DCWC) via the Village of Plainfield Water Division — the Will County southwest Chicago suburban corridor (Wisconsin Age calcareous dolomite glacial till from the Lake Michigan Lobe and Silurian Niagara Dolomite aquifer); hard supply at 214 mg/L in Will County.