San Mateo County property record for 821 Irwin Dr, Hillsborough, CA 94010
| Property Type | Single Family Home |
|---|---|
| Details | 6 bd · 5.5 ba · 6,460 sqft · built 1936 |
| Lot Size | 1.35 acres (59,014 sqft) |
| Owner | 2 Company Names on Record |
| Tax Bill | $13,145 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 028-081-030 |
| Primary APN | 028-081-030 |
|---|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 5.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 13 Rooms |
| Stories | 2 Stories |
| Building Area | 6,460 sqft Living Area |
| Gross Area | 6,860 sqft |
| 1st Floor Area | 3,410 sqft |
| 2nd Floor Area | 3,050 sqft |
| Basement Area | 400 sqft |
| Family Room | Family Room |
| Study | Study |
| Year Built | Built 1936 |
|---|---|
| Effective Year Built | Effective 1936 |
| Lot Area | 59,014 sqft |
| View / Lot | Corner |
| Garage Area | 590 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 821 IRWIN DR |
|---|---|
| City | HILLSBOROUGH |
| State | CA |
| Zip | 94010-6327 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R10025 |
| Legal Description | LOT 11 LESS SM PTN MAP OF IRWIN PROPERTY RSM 11/52 53 TOWN OF HILLSBOROUGH |
| Legal Subdivision | MAP OF IRWIN PROPERTY |
| Legal Lot Number | 11 |
| Jurisdiction | SAN MATEO CA |
| Township / Civil Division | SAN MATEO |
| Census Block Group | 1 |
| Census Block | 1014 |
| Census Tract | 605600 |
Source: San Mateo County records, as of July 15, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Company Names on Record |
|---|---|
| Mailing Address | 821 IRWIN DR, HILLSBOROUGH, CA 94010-6327 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
Source: San Mateo County assessment roll, as of July 15, 2026
| Type | Name |
|---|---|
| State | California |
| County | San Mateo County |
| Municipality | Hillsborough Town |
| Elementary School District | Hillsborough City Elementary School District (KG - 08) |
| Secondary School District | San Mateo Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $652,950 (+2%) Land $175,014 Building $477,936 | ||
| 2025 | $13,145.00 (+5.03%) Homeowner's exemption | $640,148 (+4.04%) Land $171,583 Building $468,565 | |
| 2023 | $12,515.00 (+3.84%) Homeowner's exemption | $615,292 Land $164,921 Building $450,371 | $8,930,430 |
| 2022 | $12,052.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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 | 4 in force |
| Nearby Flood Claims | 3 (1998–2023) |
| Claims Outside the SFHA | 3 of 3 |
| Most Recent Claim | Jan 2023 · Severe Winter Storms, Flooding, Landslides, And Mudslides |
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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 97% of the US · lower than 97.8% of California |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | Direct burnable vegetation |
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 | TOWN OF HILLSBOROUGH serves 11,766 people · EPA ID CA4110016 |
|---|---|
| Water Source | Purchased surface water from SAN FRANCISCO REGIONAL WATER SYSTEM |
| Last State Inspection | Mar 2026 |
| Lead | Under 1 ppb (2023–2025) 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 189 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
May also be available: AT&T, Etheric Networks, Sonic Telecom, Verizon.
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