Marin County property record for 21 Thoreau Cir, Mill Valley, CA 94941
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1.5 ba · 1,248 sqft · built 1972 |
| Lot Size | 0.028 acres (1,200 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $665,000 (Jun 2017) |
| Tax Bill | $12,402 (2025) |
| Deeds & Mortgages | Jun 2017 Sale |
| Flood Zone | Zone X (minimal risk) |
| APN | 030-291-17 |
| Primary APN | 030-291-17 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 5 Rooms |
| Stories | 2 Stories |
| Building Area | 1,248 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1972 |
|---|---|
| Effective Year Built | Effective 1972 |
| Architectural Style | Colonial |
| Lot Area | 1,200 sqft (0.028 acres) |
| Deck Area | 214 sqft |
| Patio Area | 214 sqft |
| Heating System | Central |
|---|
| Street Address | 21 THOREAU CIR |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-4634 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | OFFICIAL RECS 15 PG 6 LOT 17 |
| Legal Subdivision | SHELTER RDG 01 |
| Legal Tract | 1 |
| Legal Lot Number | 17 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 3 |
| Census Block | 3002 |
| Census Tract | 126200 |
Source: Marin County records, as of July 13, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on Record |
|---|---|
| Mailing Address | 36 PINE RIDGE RD, WELLESLEY HILLS, MA 02481-1637 |
| Owner Type | Individual |
| Vesting | Right of Survivorship |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jun 14, 2017 · Amount on Record |
| Deed Sale | Jun 14, 2017 · Amount on Record |
| Prior Sale | Jul 22, 2003 · Amount on Record |
| Deed Document Number | 201723685 |
| Prior Transfer Date | Jul 15, 2003 |
| Prior Transfer Doc | 0000115306 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | MARIN CA |
| Recording Date | Jun 14, 2017 |
| Property Address | 21 THOREAU CIR, MILL VALLEY, CA 94941-4634 |
| Document Number | 0000023685 |
| Instrument Date | Jun 13, 2017 |
| Instrument | 23685 |
| Transaction Type | Transfer |
| Record Updated | Jun 21, 2017 |
| Title Company | FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE COMPANY |
| Amount | Amount Recorded |
|---|---|
| Tax | $731.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property |
| Address | 36 PINE RIDGE RD WELLESLEY HILLS MA 024811637, WELLESLEY HILLS, MA 02481-1637 |
Source: Marin County assessment roll, as of July 13, 2026
| Type | Name |
|---|---|
| State | California |
| County | Marin County |
| Municipality | Mill Valley City |
| Elementary School District | Mill Valley Elementary School District (KG - 08) |
| Secondary School District | Tamalpais Union High School District (09 - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $786,023 (+2%) Land $282,921 Building $503,102 | |
| 2025 | $12,402.00 (+5.35%) | $770,611 (+4.04%) Land $277,373 Building $493,238 |
| 2023 | $11,772.00 (+5.35%) | $740,691 Land $266,604 Building $474,087 |
| 2022 | $11,174.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
Source: FEMA National Flood Hazard Layer, effective October 18, 2023 · 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 | 1 in force |
| Nearby Flood Claims | 18 (1980–2005) |
| Claims Outside the SFHA | 2 of 18 |
| Most Recent Claim | Dec 2005 · Severe Storms, Flooding, Mudslides, And Landslides |
| 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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 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 | 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 337 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber, Fixed Wireless in parts of the area | 100 / 20 |
May also be available: Etheric Networks, Unwired, Verizon.
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