Sonoma County property record for 21 Union St, Petaluma, CA 94952
| Property Type | Duplex |
|---|---|
| Details | 2 bd · 1 ba · 1,014 sqft · built 1927 |
| Lot Size | 0.083 acres (3,600 sqft) |
| Owner | Company Name on Record |
| Tax Bill | $4,479 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 006-272-004-000 |
| Primary APN | 006-272-004-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 2 Rooms |
| Units | 2 Units |
| Stories | 1 Story |
| Building Area | 1,014 sqft Living Area |
| 1st Floor Area | 1,014 sqft |
| Year Built | Built 1927 |
|---|---|
| Effective Year Built | Effective 1943 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 3,600 sqft (0.083 acres) |
| Garage Type | Attached |
| Garage Area | 385 sqft |
| Parking Spaces | 1 Parking Space |
| Cooling System | None |
|---|
| Old Parcel Number | 006-272-004 |
|---|---|
| Street Address | 21 UNION ST |
| City | PETALUMA |
| State | CA |
| Zip | 94952-2730 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Local Zoning Code | CITYPE |
| Legal Subdivision | CITY OF PETALUMA |
| Legal Block | 4 |
| Jurisdiction | SONOMA CA |
| Township / Civil Division | PETALUMA |
| Census Block Group | 4 |
| Census Block | 4015 |
| Census Tract | 150902 |
Source: Sonoma County records, as of September 1, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | PO BOX 2057, PETALUMA, CA 94953-2057 |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Name on Deed |
|---|---|
| Last Transfer Date | Dec 1, 1999 |
| Transfer Doc | 0000148406 |
| Record Updated | Oct 29, 2026 |
Source: Sonoma County assessment roll, as of September 1, 2026
| Type | Name |
|---|---|
| State | California |
| County | Sonoma County |
| Municipality | Petaluma City |
| Elementary School District | Petaluma City Elementary School District (KG - 06) |
| Secondary School District | Petaluma Joint Union High School District (07 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $188,064 (+2%) Land $73,957 Building $114,107 | |
| 2025 | $4,479.00 (+6.19%) | $184,377 (+4.04%) Land $72,507 Building $111,870 |
| 2023 | $4,218.00 (+0.45%) | $177,220 Land $69,693 Building $107,527 |
| 2022 | $4,199.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
Source: FEMA National Flood Hazard Layer, effective February 15, 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 Claims | 1 (1982) |
| Most Recent Claim | Jan 1982 · Severe Storms, Flood, Mudslides & High Tide |
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 96% of the US · lower than 97.4% of California |
|---|---|
| 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 | CITY OF PETALUMA serves 61,427 people · EPA ID CA4910006 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Jun 2024 |
| 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 | 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 714 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| AT&T Fiber · DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
Search by:
By searching, you agree to: Terms • Privacy • Disclosures