550 DOUGLAS RD CLAYTON CA 945171377, CLAYTON, CA 94517-1377
Mortgage
Document Number
0000008707
Date
Jan 17, 2017
Instrument
8707
Lender
Name
FRANK QUADRATO
Address
46 LA CANADA CT, CLAYTON, CA 94517-1749
Agreement
Type
Conventional Mortgage
Amount
Amount on Record
Tax Assessment & Valuation
The 2025 property tax bill for 550 Douglas Rd was $7,522 with a homeowner's exemption.
Source: Contra Costa County assessment roll, as of July 14, 2026
Property Jurisdictions
Type
Name
State
California
County
Contra Costa County
Municipality
Clayton City
Unified School District
Mount Diablo Unified School District (KG - 12)
Tax Bill & Assessment History
Year
Tax Bill
Assessed Value
2026
$660,507 (+2%)Land $266,502Building $394,005
2025
$7,522.00Homeowner's exemption
$647,557Land $261,277Building $386,280
2023
$7,247.00 (+0.98%)Homeowner's exemption
$622,413Land $251,132Building $371,281
2022
$7,177.00
Assessed value is set for property tax purposes and is not a market price estimate.
Flood
FEMA maps place 550 Douglas Rd in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
FEMA Flood Zone
Zone X minimal risk
Nearest Special Flood Hazard Area
Zone AE, within 500 ft
Flood Insurance Requirement
Not required lenders may require it
Nearby Flood Policies
4 in force
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
Wildfire risk around 550 Douglas Rd is moderate, ranking above 67% of the US, with a 0.2% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
Wildfire Risk
Moderate above 67% of the US · above 42% of California
Wildfire Likelihood
0.2% 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.
Drinking Water
Source: EPA Safe Drinking Water Information System, as of September 2026
Water System
CONTRA COSTA WATER DISTRICT serves 210,500 people · EPA ID CA0710003
Water Source
Surface water
Last State Inspection
Jan 2022
Lead
Under 1 ppb (2026–2028) action level 15 ppb
Violations Reported to EPA
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.
Internet Providers
Source: FCC Broadband Data Collection, based on 351 locations within half a mile, as of December 31, 2025