Charleston County property record for 646 Williamson Dr, Mount Pleasant, SC 29464
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,188 sqft · built 1983 |
| Lot Size | 0.22 acres (9,583 sqft) |
| Owner | Individual Name on File |
| Tax Bill | $1,457 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 517-04-00-167 |
| Primary APN | 517-04-00-167 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Stories | 1 Story |
| Building Area | 1,188 sqft Living Area |
| 1st Floor Area | 744 sqft |
| Upper Floors Area | 444 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1983 |
|---|---|
| Effective Year Built | Effective 1983 |
| Exterior Material | Wood Siding |
| Foundation Type | Slab (Mat/Raft) |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 9,583 sqft (0.22 acres) |
| Lot Dimensions | 165 ft deep x 59 ft wide |
| Porch | Slab |
|---|---|
| Porch Area | 576 sqft |
| Shed | 1 Shed |
| Shed Area | 196 sqft |
| Heating System | Heat Pump |
|---|
| Street Address | 646 WILLIAMSON DR |
|---|---|
| City | MOUNT PLEASANT |
| State | SC |
| Zip | 29464-3520 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | SUBDIVISION NAME -BAY TREE DESCRIPTION -LOT SF-2 |
| Legal Subdivision | BAY TREE |
| Legal Lot Number | S,F-2 |
| Jurisdiction | CHARLESTON SC |
| Township / Civil Division | MOUNT PLEASANT |
| Census Block Group | 3 |
| Census Block | 3006 |
| Census Tract | 4607 |
646 Williamson Dr is owned and occupied by an individual.
Source: Charleston County records, as of September 23, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 646 WILLIAMSON DR, MOUNT PLEASANT, SC 29464-3520 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 646 Williamson Dr was $1,457, up 11.6% from the year before.
Source: Charleston County assessment roll, as of August 1, 2025
| Type | Name |
|---|---|
| State | South Carolina |
| County | Charleston County |
| Municipality | Mount Pleasant Town |
| Unified School District | Charleston County School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $1,457.00 (+11.56%) | $353,299 (+2,774.69%) Land $249,744 Building $103,555 | $773,900 Land $360,000 Building $413,900 |
| 2024 | $1,306.00 | $12,290 | |
| 2022 | $1,182.00 | $12,290 | $401,898 Land $284,098 Building $117,800 |
| 2020 | $401,898 Land $284,098 Building $117,800 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 646 Williamson Dr in Zone X, an area of moderate flood risk, within 100 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective September 9, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X moderate risk |
|---|---|
| 500-Year Floodplain | Yes 0.2% annual chance |
| Nearest Special Flood Hazard Area | Zone AE, within 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 177 policies |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 177 in force |
| Nearby Flood Claims | 89 (1982–2025) |
| Claims Outside the SFHA | 36 of 89 |
| Most Recent Claim | Jun 2025 · rainfall accumulation |
| Claims by Event |
|
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Wildfire risk around 646 Williamson Dr is low, with 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 95% of the US · lower than 98.6% of South Carolina |
|---|---|
| Wildfire Likelihood | 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 | MT PLEASANT WATERWORKS serves 91,500 people · EPA ID SC1010002 |
|---|---|
| Water Source | Purchased surface water from CHARLESTON WATER SYSTEM |
| Last State Inspection | Dec 2022 |
| Lead | 1 ppb (2024–2026) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None 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 314 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
May also be available: Verizon.
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