South Riding Water Hardness & Quality Report (2026)
Water Hardness
6.8 grains per gallon
Source
reservoir
pH Level
7.7
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
220.7 mg/L
Est. Daily Cost
$0.31
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 South Riding, your appliances are currently losing 16% efficiency due to mineral buildup.
| Appliance | In South Riding | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.7 yrs | 8.5 yrs | -33% |
| Washing Machine | 9.3 yrs | 12 yrs | -22% |
| Water Heater | 10.9 yrs | 15 yrs | -27% |
Regional Water Comparison
How South Riding compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ South Riding, Virginia | 117 mg/L | 6 ppt | 🟡 Moderately Hard | reservoir |
| Chantilly, Virginia | 183.5 mg/L | 9.5 ppt | 🔴 Very Hard | reservoir |
| Broadlands, Virginia | 171.5 mg/L | 8.9 ppt | 🟠 Hard | reservoir |
| Oak Hill, Virginia | 114.5 mg/L | 5.8 ppt | 🟡 Moderately Hard | reservoir |
| Centreville, Virginia | 178.5 mg/L | 9.3 ppt | 🟠 Hard | reservoir |
National Benchmark
How South Riding compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ South Riding | 117 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes South Riding's Water Unique?
Local geology and source profile
South Riding, Virginia, in Loudoun County in the western outer ring of the Washington, DC metropolitan area — a large master-planned community near Dulles International Airport — receives its municipal water from Loudoun Water, the regional water authority serving Loudoun County communities. Loudoun Water draws from Goose Creek via the Goose Creek Reservoir (also known as the Raw Water Reservoir at Evergreen Mills) and supplementary Potomac River withdrawals during peak demand periods. This combined system provides treated water to the rapidly growing Loudoun County suburbs including South Riding's extensive residential development.
The moderately soft 117 mg/L hardness and TDS of 220.7 mg/L reflect Goose Creek's Loudoun County watershed character. Goose Creek drains the Loudoun Valley Piedmont — an area of Precambrian metamorphic rocks (Catoctin Formation metabasalt, Loudoun Formation metasediments) and Triassic Balls Bluff Siltstone of the Culpeper Basin — terrains with moderate dissolved mineral yield. Unlike the hard water produced by the Shenandoah Valley's open karst limestone terrain, Loudoun County's Piedmont and Triassic basin rocks are less carbonate-rich, producing a moderately soft supply. South Riding's supply is notably softer than nearby communities drawing from the Potomac River directly.
At 117 mg/L, South Riding's water is moderately soft — comfortable for everyday household use in this fast-growing suburban community. Scale accumulates gradually in kettles and appliances over several months, soap lathers well, and the dishwasher produces clean glassware with standard rinse aid. Semi-annual descaling of kettles and coffee machines is adequate. The PFAS level of 6.0 ppt is moderate for the Northern Virginia corridor — a certified drinking water filter for daily tap water is a sensible addition given the region's overall PFAS profile near Dulles Airport and its associated industrial activity.
Geology & Source: South Riding in Loudoun County draws from Loudoun Water via Goose Creek Reservoir — Goose Creek drains the Loudoun Piedmont over Triassic Balls Bluff Siltstone and Precambrian metamorphic terrain with limited carbonate contact — Piedmont and Triassic basin watershed geology produces moderately soft water at 117 mg/L in western Loudoun County.