Gwynn Oak Water Hardness & Quality Report (2026)
Water Hardness
10.7 grains per gallon
Source
reservoir
pH Level
8.2
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
459.6 mg/L
Est. Daily Cost
$0.49
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 Gwynn Oak, your appliances are currently losing 24% efficiency due to mineral buildup.
| Appliance | In Gwynn Oak | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 3.6 yrs | 8.5 yrs | -58% |
| Washing Machine | 6.8 yrs | 12 yrs | -43% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How Gwynn Oak compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Gwynn Oak, Maryland | 182.5 mg/L | 10 ppt | 🔴 Very Hard | reservoir |
| Lochearn, Maryland | 119.5 mg/L | 6.4 ppt | 🟡 Moderately Hard | reservoir |
| Woodlawn, Maryland | 129 mg/L | 6.9 ppt | 🟠 Hard | reservoir |
| Pikesville, Maryland | 85 mg/L | 4.4 ppt | 🟡 Moderately Hard | reservoir |
| Catonsville, Maryland | 119.5 mg/L | 6.4 ppt | 🟡 Moderately Hard | reservoir |
National Benchmark
How Gwynn Oak compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Gwynn Oak | 182.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Gwynn Oak home
Shop water softeners on Amazon.com →
What Makes Gwynn Oak's Water Unique?
Local geology and source profile
Gwynn Oak, Maryland, an unincorporated community in northwest Baltimore County adjacent to the Baltimore City boundary — historically significant as the site of the 1963 Gwynn Oak Amusement Park civil rights protests (one of Maryland's landmark racial integration demonstrations), a diverse northwest Baltimore working-class community with a significant African-American and Liberian-American population, adjacent to the Gwynns Falls stream valley park system — draws its municipal water supply from the Patuxent River (Loch Raven Reservoir) via the Baltimore County Bureau of Utilities. Water hardness in Gwynn Oak measures 182.5 mg/L — classified as hard.
Gwynn Oak's hard supply — harder than nearby Roland Park (148 mg/L) on the same Loch Raven watershed — reflects the Baltimore County northwest suburban distribution infrastructure's mineral accumulation. Gwynn Oak developed primarily in the 1940s–1960s as northwest Baltimore County's working-class suburban corridor. The Baltimore County Bureau of Utilities infrastructure in the Gwynn Oak zone includes aging cast-iron mains from the mid-20th century residential buildout — these mains accumulate more mineral content from the Loch Raven supply than the newer or better-maintained Baltimore City Roland Park zone, producing the hard 182.5 mg/L at Gwynn Oak household taps.
At 182.5 mg/L, Gwynn Oak 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. Baltimore County Bureau of Utilities consistently delivers water meeting all Maryland MDE and EPA Safe Drinking Water Act requirements.
Geology & Source: River supply from the Patuxent River and Susquehanna River (Conowingo Reservoir) via the Baltimore City Department of Public Works and the Baltimore County Bureau of Utilities — the Baltimore County northwest Gwynn Oak corridor (Wissahickon Formation calcareous-poor schist Piedmont, with Baltimore County distribution zone); hard supply at 182.5 mg/L in Baltimore County.