Middlesex County and Waltham City property record for 21 Ash St, Waltham, MA 02453
| Property Type | Duplex |
|---|---|
| Details | 4 bd · 2.5 ba · 2,654 sqft · built 1900 |
| Lot Size | 0.086 acres (3,751 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $520,000 (Sep 2016) |
| Tax Bill | $9,345 (2026) |
| Flood Zone | Zone X (minimal risk) |
| APN | WALT M:068 B:023 L:0003 |
| Primary APN | WALT M:068 B:023 L:0003 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 8 Rooms |
| Units | 2 Units |
| Stories | 2 Stories |
| Building Area | 2,654 sqft Living Area |
| Gross Area | 3,053 sqft |
| Basement Area | 907 sqft |
| Finished Basement | 907 sqft |
| Unfinished Basement | 1,814 sqft |
| Year Built | Built 1900 |
|---|---|
| Effective Year Built | Effective 1900 |
| Architectural Style | Duplex Single |
| Exterior Material | Aluminum/Vinyl |
| Construction Type | Frame |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 3,751 sqft (0.086 acres) |
| Garage Type | Detached |
| Heating System | Hot Water |
|---|---|
| Heating Fuel | Gas |
| Account Number | 3855 |
|---|---|
| Street Address | 21 ASH ST |
| City | WALTHAM |
| State | MA |
| Zip | 02453-3901 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | 1 |
| Legal Block | 23 |
| Legal Lot Number | 3 |
| Jurisdiction | WALTHAM MA |
| Township / Civil Division | WALTHAM |
| Census Block Group | 4 |
| Census Block | 4004 |
| Census Tract | 368600 |
21 Ash St, a duplex, is owned and occupied by two individuals who bought it in September 2016.
Source: Middlesex County and Waltham City records, as of October 20, 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 | 2 Individual Names on File |
|---|---|
| Mailing Address | 21 ASH ST, WALTHAM, MA 02453-3901 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Husband and Wife |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Sep 6, 2016 · Amount on File |
| Deed Sale | Sep 6, 2016 · Amount on File |
| Prior Sale | Jan 12, 2016 · Amount on File |
| Deed Book / Page | 67961 / 181 |
| Transfer Doc | 067961-181 |
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 21 Ash St was $9,345, up 14.5% from the year before.
Source: Middlesex County and Waltham City assessment roll, as of April 14, 2026
| Type | Name |
|---|---|
| State | Massachusetts |
| County | Middlesex County |
| Municipality | Waltham City |
| Unified School District | Waltham School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $9,345.00 (+14.47%) | $905,500 (+8.91%) Land $375,300 Building $530,200 | $921,189 |
| 2025 | $8,164.00 (-1.78%) | $831,400 (-3.57%) Land $340,900 Building $490,500 | |
| 2024 | $8,312.00 (+8.47%) | $862,200 (+16.12%) Land $340,900 Building $521,300 | |
| 2023 | $7,663.00 | $742,500 Land $310,500 Building $432,000 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 21 Ash St in Zone X, an area of minimal flood risk, though there have been 5 flood claims nearby since 1979.
Source: FEMA National Flood Hazard Layer, effective September 10, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 3 in force |
| Nearby Flood Claims | 5 (1979–1987) |
| Claims Outside the SFHA | 3 of 5 |
| Most Recent Claim | Apr 1987 · Severe Storms & Flooding |
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.
The area around 21 Ash St has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within 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 | WALTHAM WATER DEPARTMENT serves 65,218 people · EPA ID MA3308000 |
|---|---|
| Water Source | Purchased surface water from MWRA |
| Last State Inspection | Jun 2024 |
| Lead | 2 ppb (2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 1 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 812 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 / 2,000 |
| Astound Broadband Cable · Fiber in parts of the area | 1,500 / 50 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: AT&T.
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