Charles County property record for 820 Stone Ave, Waldorf, MD 20602
| Property Type | Public School (Administration, Campus, Dorms, Instruction) |
|---|---|
| Details | 76,819 sqft · built 1967 |
| Lot Size | 21.6 acres (943,510 sqft) |
| Owner | Company Name on File |
| Tax Bill | $150,969 (2023) |
| Flood Zone | Zone X (minimal risk) |
| APN | 06-066577 |
| Primary APN | 06-066577 |
|---|---|
| Alternative APNs |
|
| Stories | 1 Story |
|---|---|
| Building Area | 76,819 sqft Gross Area |
| 1st Floor Area | 76,819 sqft |
| Fire Sprinklers | Fire Sprinklers |
| Year Built | Built 1967 |
|---|---|
| Effective Year Built | Effective 1967 |
| Exterior Material | Brick Veneer |
| Construction Type | Brick |
| Fire Resistance | Masonry Walls, Wood Interior |
| Roof Type | Flat |
| Roof Material | Built-Up Asphalt |
| Lot Area | 943,510 sqft |
| View / Lot | Commercial/Industrial |
| Shed | 1 Shed |
| Shed Area | 665 sqft |
| Cooling System | Central |
|---|---|
| Heating System | HVAC |
| Sewer | Municipal |
| Account Number | 066577 |
|---|---|
| Street Address | 820 STONE AVE |
| City | WALDORF |
| State | MD |
| Zip | 20602-2844 |
| Property Category | Public Works |
| Property Type | Public Works > Public School (Administration, Campus, Dorms, Instruction) |
| Local Zoning Code | RH |
| Legal Description | 21.66 AC DR SAMUEL A MUDD SCHOOL ST CHARLES - CARRINGTON |
| Legal Subdivision | ST CHARLES - CARRINGTON |
| Legal Block | 1 |
| Jurisdiction | CHARLES MD |
| Township / Civil Division | 6, WALDORF |
| Census Block Group | 1 |
| Census Block | 1021 |
| Census Tract | 850901 |
820 Stone Ave, a public works property, is owned by a company.
Source: Charles County records, as of September 16, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | PO BOX 2770, LA PLATA, MD 20646-2770 |
| Owner Type | Company |
| Vesting | Company |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
Source: Charles County assessment roll, as of September 16, 2026
| Type | Name |
|---|---|
| State | Maryland |
| County | Charles County |
| Unified School District | Charles County Public Schools (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $12,531,000 | $12,966,300 Land $1,379,000 Building $11,587,300 | |
| 2023 | $150,969.00 Additional exemption filed | $10,564,700 | $11,660,400 Land $1,379,000 Building $10,281,400 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 820 Stone Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 15, 2021
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 820 Stone Ave is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 98% of the US · lower than 96% of Maryland |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | WALDORF - CHARLES COUNTY DPW serves 84,296 people · EPA ID MD0080049 |
|---|---|
| Water Source | Purchased surface water from WASHINGTON SUBURBAN SANITARY COMMISSION |
| Last State Inspection | Jul 2025 |
| Lead | Under 1 ppb (2021–2023) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 3 last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 214 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
| Xfinity Cable | 2,000 / 250 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: AT&T.
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