Hockessin Water Hardness & Quality Report (2026)
Water Hardness
9.7 grains per gallon
Source
groundwater
pH Level
8.2
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
535.6 mg/L
Est. Daily Cost
$0.44
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 Hockessin, your appliances are currently losing 22% efficiency due to mineral buildup.
| Appliance | In Hockessin | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.1 yrs | 8.5 yrs | -52% |
| Washing Machine | 7.5 yrs | 12 yrs | -38% |
| Water Heater | 9 yrs | 15 yrs | -40% |
Regional Water Comparison
How Hockessin compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Hockessin, Delaware | 166 mg/L | 9.5 ppt | 🟠 Hard | groundwater |
| Newark, Delaware | 81 mg/L | 5.2 ppt | 🟡 Moderately Hard | groundwater |
| Brookside, Delaware | 101 mg/L | 6.2 ppt | 🟡 Moderately Hard | groundwater |
| Wilmington, Delaware | 157.5 mg/L | 9.1 ppt | 🟠 Hard | groundwater |
| Bear, Delaware | 85 mg/L | 5.4 ppt | 🟡 Moderately Hard | groundwater |
National Benchmark
How Hockessin compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Hockessin | 166 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Hockessin's Water Unique?
Local geology and source profile
Hockessin, Delaware, in New Castle County — a New Castle County community adjacent to Newark and Wilmington in northern Delaware — receives its water from the Artesian Water Company, drawing from Brandywine Creek or the Cockeysville Marble aquifer (New Castle County) through the northern Delaware distribution.
The hard 166 mg/L hardness and TDS of 535.6 mg/L reflect the northern Delaware New Castle County supply's hard calcareous character — driven by the Precambrian Cockeysville Marble aquifer, a crystalline calcareous marble formation that dissolves significantly more calcium and magnesium than typical metamorphic rocks, producing hard water with elevated TDS consistent with Hockessin's marble-dominated aquifer zone in the Wilmington-Newark Piedmont. The Brandywine-Cockeysville aquifer at New Castle County — Precambrian Cockeysville Marble (highly calcareous — primary hardness contributor), Precambrian Wissahickon Schist (insoluble — dilutant), and Precambrian Glenarm Series (slightly calcareous — secondary contributor).
At 166 mg/L with TDS 536, Hockessin's water is hard. A water softener is recommended to prevent scale buildup in appliances. A reverse osmosis system is advisable for drinking water. The PFAS level of 9.5 ppt warrants a certified drinking water filter — the New Castle County Wilmington-Newark industrial corridor and Dover Air Force Base (Kent County — AFFF, regional) contribute to Hockessin's elevated readings.
Geology & Source: Hockessin in New Castle County draws from the Artesian Water Company on Brandywine Creek or Cockeysville Marble aquifer (New Castle County, northern Delaware) — the Brandywine watershed drains the Delaware Piedmont (Precambrian Cockeysville Marble — calcareous) and Precambrian Wissahickon Schist (insoluble) — Delaware New Castle County Brandywine-Cockeysville Marble Precambrian calcareous aquifer produces hard water at 166 mg/L with TDS 535.6 mg/L.