Marin County property record for 21 Arroyo Ave, San Anselmo, CA 94960
| Property Type | Single Family Home |
|---|---|
| Details | 6 bd · 3.5 ba · 2,504 sqft · built 1962 |
| Lot Size | 0.152 acres (6,625 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $670,000 (May 2012) |
| Tax Bill | $13,239 (2025) |
| Deeds & Mortgages | Sep 2020 Mortgage |
| Flood Zone | Zone AE (high risk) |
| APN | 005-101-29 |
| Primary APN | 005-101-29 |
|---|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 3.5 Baths |
| Half Baths | 1 Half Bath |
| Building Area | 2,504 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1962 |
|---|---|
| Effective Year Built | Effective 1988 |
| Architectural Style | Contemporary |
| Lot Area | 6,625 sqft (0.152 acres) |
| Garage Area | 432 sqft |
| Parking Spaces | 2 Parking Spaces |
| Deck Area | 464 sqft |
| Patio Area | 640 sqft |
| Heating System | Central |
|---|
| Street Address | 21 ARROYO AVE |
|---|---|
| City | SAN ANSELMO |
| State | CA |
| Zip | 94960-1213 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Subdivision | SHORT RANCH 01 |
| Legal Lot Number | 86,87 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | ROSS VALLEY |
| Census Block Group | 1 |
| Census Block | 1013 |
| Census Tract | 115000 |
21 Arroyo Ave is held in a trust since August 2020.
Source: Marin County records, as of July 13, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 21 ARROYO AVE, SAN ANSELMO, CA 94960-1213 |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
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 | 2 Names on Deed |
|---|---|
| Last Sale | May 25, 2012 · Amount on File |
| Deed Sale | May 25, 2012 · Amount on File |
| Deed Document Number | 201232058 |
| Last Transfer Date | Aug 21, 2020 |
| Transfer Doc | 0000041526 |
| Record Updated | Oct 29, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | MARIN CA |
| Recording Date | Sep 8, 2020 |
| Property Address | 21 ARROYO AVE, SAN ANSELMO, CA 94960-1213 |
| Document Number | 0000041526 |
| Instrument Date | Aug 21, 2020 |
| Instrument | 2020-0041526 |
| Transaction Type | Transfer |
| Record Updated | Aug 13, 2021 |
| Title Company | FIDELITY NATIONAL TITLE CO |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 21 ARROYO AVE, SAN ANSELMO, CA 94960-1213 |
| Document Number | 0000041527 |
|---|---|
| Date | Sep 8, 2020 |
| Instrument | 2020-0041527 |
| Name | AMERICAN PACIFIC MORTGAGE CORP |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 240 Months |
| Due | Sep 1, 2040 |
The 2025 property tax bill for 21 Arroyo Ave was $13,239.
Source: Marin County assessment roll, as of July 13, 2026
| Type | Name |
|---|---|
| State | California |
| County | Marin County |
| Municipality | San Anselmo Town |
| Elementary School District | Ross Valley Elementary School District (KG - 08) |
| Secondary School District | Tamalpais Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $927,432 (+2%) Land $448,385 Building $479,047 | |
| 2025 | $13,239.00 | $909,253 Land $439,596 Building $469,657 |
| 2023 | $12,739.00 (+1.12%) | $873,953 Land $422,530 Building $451,423 |
| 2022 | $12,598.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 21 Arroyo Ave in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective October 18, 2023 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on File median of 16 policies |
| Community Rating System | Class 8 (10% premium discount) |
| Nearby Flood Policies | 16 in force |
| Nearby Flood Claims | 21 (1980–2017) |
| Claims Outside the SFHA | 13 of 21 |
| Most Recent Claim | Apr 2017 · river or lake flooding |
| 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 21 Arroyo Ave is low, with a 0.04% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 64% of the US · lower than 78% of California |
|---|---|
| Wildfire Likelihood | 0.04% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 | MARIN MUNICIPAL WATER DISTRICT serves 188,116 people · EPA ID CA2110002 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Aug 2023 |
| Lead | Under 1 ppb (2019–2021) 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. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 472 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: T-Mobile, Unwired.
5G (outdoors only) and 4G LTE
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