Adams Morgan Water Hardness & Quality Report (2026)
Water Hardness
7.4 grains per gallon
Source
river
pH Level
7.9
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
284.7 mg/L
Est. Daily Cost
$0.34
energy & soap waste
Source: See methodology section below · 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 Adams Morgan, your appliances are currently losing 17% efficiency due to mineral buildup.
| Appliance | In Adams Morgan | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.4 yrs | 8.5 yrs | -36% |
| Washing Machine | 8.9 yrs | 12 yrs | -26% |
| Water Heater | 10.6 yrs | 15 yrs | -29% |
Regional Water Comparison
How Adams Morgan compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Adams Morgan, District of Columbia | 126 mg/L | 8.1 ppt | 🟠 Hard | river |
| Mount Pleasant, District of Columbia | ≈ 120–179 mg/L | 7.2 ppt | 🟠 Hard | river |
| Dupont Circle, District of Columbia | ≈ 120–179 mg/L | 4 ppt | 🟠 Hard | river |
| Columbia Heights, District of Columbia | ≈ 120–179 mg/L | 9.7 ppt | 🟠 Hard | river |
| Pleasant Plains, District of Columbia | 120.5 mg/L | 8.1 ppt | 🟠 Hard | river |
National Benchmark
How Adams Morgan compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Adams Morgan | 126 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Adams Morgan's Water Unique?
Local geology and source profile
DC Water supplies water to Adams Morgan and the rest of Washington, D.C., serving about 681,000 residents. The primary source is the Potomac River, with water drawn from intakes at Great Falls and Little Falls. This raw water is then transported to the Dalecarlia Water Treatment Plant, operated by the U.S. Army Corps of Engineers' Washington Aqueduct, for purification. The vast Potomac River watershed, spanning 14,670 square miles across Maryland, Virginia, West Virginia, and D.C., includes important tributaries such as the Shenandoah and Occoquan rivers.
The geology upstream plays a significant role in the water's mineral content. The watershed crosses Paleozoic carbonate rock formations, including Ordovician limestones and Silurian dolomites. As these rocks weather, they release calcium and magnesium into the Potomac River. This dissolution process, particularly in the Piedmont and Blue Ridge regions, contributes to the naturally moderately hard character of the water supply.
This moderate hardness means you might notice some scale buildup in appliances like dishwashers, water heaters, and coffee makers. You may also see spotting on glassware and residue in showers. Laundry detergents might need to be adjusted, and some residents find their skin or hair feels drier. Regularly descaling appliances with vinegar can help, and many households find that installing a water softener is a good investment to extend appliance life and reduce the amount of soap and detergent needed.
Geology & Source: Potomac River watershed; limestone and dolomite formations dissolve calcium and magnesium
Other District of Columbia Water Reports
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Frequently Asked Questions
Is Adams Morgan's water safe to drink?
Do I need a water softener in Adams Morgan?
How does Adams Morgan compare to the USA average?
Data Sources & Methodology
Water quality data for Adams Morgan is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.