Stonington Town property record for 20 Williams St, Mystic, CT 06355
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 1,056 sqft · built 1955 |
| Lot Size | 0.11 acres (4,792 sqft) |
| Owner | Individual Name on File |
| Tax Bill | $5,262 (2026) |
| Flood Zone | Zone X (minimal risk) |
| APN | STON M:173 B:6 L:9 |
| Primary APN | STON M:173 B:6 L:9 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,056 sqft Living Area |
| Gross Area | 2,408 sqft |
| 1st Floor Area | 1,056 sqft |
| Basement Area | 816 sqft |
| Unfinished Basement | 816 sqft |
| Year Built | Built 1955 |
|---|---|
| Effective Year Built | Effective 1955 |
| Architectural Style | Ranch |
| Exterior Material | Wood Siding |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 4,792 sqft (0.11 acres) |
| Deck Area | Deck Area |
| Cooling System | HVAC |
|---|---|
| Heating System | Forced Air with A/C |
| Heating Fuel | Gas |
| Account Number | 355300 |
|---|---|
| Street Address | 20 WILLIAMS ST |
| City | MYSTIC |
| State | CT |
| Zip | 06355-2724 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | RH-10 |
| Legal Block | 6 |
| Legal Lot Number | 9 |
| Jurisdiction | STONINGTON CT |
| Township / Civil Division | STONINGTON |
| Census Block Group | 1 |
| Census Block | 1005 |
| Census Tract | 705300 |
20 Williams St is owned and occupied by an individual.
Source: Stonington Town records, as of October 20, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 20 WILLIAMS ST, STONINGTON, CT 06378-1043 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
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 |
The 2026 property tax bill for 20 Williams St was $5,262, up 6.7% from the year before.
Source: Stonington Town assessment roll, as of June 25, 2026
| Type | Name |
|---|---|
| State | Connecticut |
| County Subdivision | Stonington Town |
| Unified School District | Stonington School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $5,262.00 (+6.71%) | $246,800 (-) Land $101,100 Building $145,700 | $522,027 (+202.17%) |
| 2025 | $4,931.00 | $246,800 Land $101,100 Building $145,700 | $172,760 Land $70,770 Building $101,990 |
| 2024 | $4,931.00 (+3.99%) | ||
| 2023 | $4,742.00 (+28.09%) | $246,800 (+69.27%) Land $101,100 Building $145,700 | |
| 2022 | $3,702.00 | $145,800 Land $71,000 Building $74,800 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 20 Williams St in Zone X, an area of minimal flood risk, within 100 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective September 20, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 100 ft |
| 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 20 Williams St 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 97.2% of Connecticut |
|---|---|
| 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 | AQUARION-MYSTIC private · serves 10,788 people · EPA ID CT1370011 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Nov 2025 |
| Lead | Under 1 ppb (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 168 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Frontier Fiber | 7,000 / 7,000 |
| Xfinity Cable | 2,000 / 250 |
| Breezeline Cable | 1,000 / 50 |
May also be available: AT&T, T-Mobile, Verizon.
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