Southwest Waterfront Water Hardness & Quality Report (2026)
Water Hardness
6.6 grains per gallon
Source
river
pH Level
7.8
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
254.8 mg/L
Est. Daily Cost
$0.30
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 Southwest Waterfront, your appliances are currently losing 15% efficiency due to mineral buildup.
| Appliance | In Southwest Waterfront | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.9 yrs | 8.5 yrs | -31% |
| Washing Machine | 9.4 yrs | 12 yrs | -22% |
| Water Heater | 11.1 yrs | 15 yrs | -26% |
Regional Water Comparison
How Southwest Waterfront compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Southwest Waterfront, District of Columbia | 113.5 mg/L | 7.5 ppt | 🟡 Moderately Hard | river |
| Downtown DC, District of Columbia | 113 mg/L | 7.5 ppt | 🟡 Moderately Hard | river |
| Capitol Riverfront, District of Columbia | 113 mg/L | 7.5 ppt | 🟡 Moderately Hard | river |
| Capitol Hill, District of Columbia | 133 mg/L | 9.2 ppt | 🟠 Hard | river |
| Barracks Row, District of Columbia | 113 mg/L | 7.5 ppt | 🟡 Moderately Hard | river |
National Benchmark
How Southwest Waterfront compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Southwest Waterfront | 113.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Southwest Waterfront's Water Unique?
Local geology and source profile
Southwest Waterfront, in the District of Columbia — a DC neighborhood adjacent to Navy Yard and Capitol Hill on the Anacostia River waterfront in southwest DC — receives its water from DC Water, drawing from the Potomac River at the Washington Aqueduct (McMillan and Dalecarlia Reservoirs) through the DC distribution system.
The moderately hard 113.5 mg/L hardness and TDS of 254.8 mg/L are virtually identical to the Kennedy Street DC supply (113 mg/L) — confirming the uniform DC Water Potomac supply character across all DC service zones. The Potomac River at the Washington Aqueduct drains the Virginia Blue Ridge — Precambrian Catoctin Greenstone (insoluble), Triassic Culpeper Basin (calcareous redbed — moderate hardness contributor), and Cambrian Conococheague Formation (calcareous — primary hardness contributor). The Triassic and Cambrian calcareous input produces the moderately hard DC supply.
At 113.5 mg/L, Southwest Waterfront's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 7.5 ppt warrants a certified reverse osmosis drinking water filter — Marine Corps Base Quantico (Prince William County — AFFF), Fort Belvoir (Fairfax County — AFFF), and the Potomac River military-industrial PFAS complex contribute to Southwest Waterfront's elevated readings.
Geology & Source: Southwest Waterfront in District of Columbia draws from DC Water on the Potomac River via the Washington Aqueduct (District of Columbia) — the Potomac drains the Virginia Blue Ridge (Precambrian Catoctin Greenstone — insoluble, Triassic Culpeper Basin — calcareous, Cambrian Conococheague — calcareous) — District of Columbia Potomac River Blue Ridge watershed produces moderately hard water at 113.5 mg/L with TDS 254.8 mg/L.