Boulder County property record for 509 Spring Dr, Boulder, CO 80303
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.75 ba · 3,273 sqft · built 1969 |
| Lot Size | 0.947 acres (41,238 sqft) |
| Owner | Company Name on File |
| Last Sale | $125,000 (Aug 1987) |
| Tax Bill | $9,297 (2025) |
| Deeds & Mortgages | Oct 2021 Transfer Feb 2017 Line of Credit |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-12-3-04-001 |
| Primary APN | 1577-12-3-04-001 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.75 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 11 Rooms |
| Stories | 1 Story |
| Building Area | 3,273 sqft Living Area |
| Gross Area | 3,816 sqft |
| 1st Floor Area | 1,673 sqft |
| Basement Area | 1,649 sqft |
| Finished Basement | 1,600 sqft |
| Unfinished Basement | 49 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1969 |
|---|---|
| Effective Year Built | Effective 1985 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 41,238 sqft (0.947 acres) |
| Garage Type | Attached |
| Garage Area | 494 sqft |
| Parking Spaces | 6 Parking Spaces |
| Porch | Porch |
| Porch Area | 36 sqft |
| Patio Area | 126 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Hot Water |
| Account Number | R0035710 |
|---|---|
| Street Address | 509 SPRING DR |
| City | BOULDER |
| State | CO |
| Zip | 80303-4910 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | ER |
| Legal Description | LOT 1 APOLLO ESTATES |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 12 |
| Legal Subdivision | APOLLO ESTATES - BOV |
| Legal Block | 3 |
| Legal Lot Number | 1 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 3 |
| Census Block | 3057 |
| Census Tract | 12710 |
Source: Boulder County records · APN 1577-12-3-04-001
Assessment roll updated June 15, 2026 · Last verified August 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 File |
|---|---|
| Mailing Address | 509 SPRING DR, BOULDER, CO 80303-4910 |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
| Date | Document |
|---|---|
| Oct 05, 2021 | Intrafamily Transfer, Transfer |
| Feb 17, 2017 | Deed of Trust, Mortgage · Line of Credit KEYBANK USA |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Aug 06, 1987 · Amount on Record |
| Deed Sale | Aug 06, 1987 · Amount on Record |
| Prior Sale | Aug 06, 1987 |
| Deed Document Number | 1987868704 |
| Last Transfer Date | Oct 05, 2021 |
| Transfer Doc | 0003918667 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | BOULDER CO |
| Recording Date | Oct 05, 2021 |
| Property Address | 509 SPRING DR, BOULDER, CO 80303-4910 |
| Document Number | 0003918667 |
| Instrument Date | Oct 05, 2021 |
| Instrument | 3918667 |
| Transaction Type | Transfer |
| Record Updated | Oct 26, 2021 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | No Consideration Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Family Trust |
| Address | 509 SPRING DR, BOULDER, CO 80303-4910 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | BOULDER CO |
| Property Address | 509 SPRING DR, BOULDER, CO 80303-4910 |
| Document Number | 0003578102 |
| Instrument Date | Feb 17, 2017 |
| Transaction Type | Mortgage |
| Record Updated | Mar 16, 2017 |
| Title Company | ACCURATE TITLE GROUP, ACCURATE TITLE GRP |
| Name | Verified Name |
|---|---|
| Address | 509 SPRING DR BOULDER CO 803034910, BOULDER, CO 80303-4910 |
| Document Number | 0003578102 |
|---|---|
| Date | Mar 02, 2017 |
| Instrument | 3578102 |
| Name | KEYBANK USA |
|---|---|
| Type | Bank |
| Address | BROOKLYN, OH 44144 |
| Type | Line of Credit |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Mar 01, 2047 |
| Rate Type | Adjustable Rate |
|---|
Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified August 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $107,379 (+8.8%) Land $52,088 Building $55,291 | $1,579,100 (-) Land $766,000 Building $813,100 | |
| 2025 | $9,297.00 (+6.63%) | $98,694 (-6.69%) Land $47,875 Building $50,819 | $1,579,100 (+0.03%) Land $766,000 Building $813,100 |
| 2023 | $8,719.00 (+36.06%) | $105,766 (+46.44%) Land $36,575 Building $69,191 | $1,578,600 (+51.91%) Land $545,900 Building $1,032,700 |
| 2022 | $6,408.00 | $72,224 Land $27,320 Building $44,904 | $1,039,200 Land $393,100 Building $646,100 |
Source: FEMA National Flood Hazard Layer as of October 14, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 8 in force |
| Nearby Flood Claims | 4 (1983–2016) |
| Claims Outside the SFHA | 4 of 4 |
| Most Recent Claim | May 2016 · other causes |
| Claims by Event |
|
| Wildfire Risk | High above 72% of the US · above 69% of Colorado |
|---|---|
| Wildfire Likelihood | 0.4% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Fixed Wireless | 2,500 / 2,500 |
| Xfinity Cable | 2,000 / 2,000 |
| Verizon Fixed Wireless | 300 / 20 |
| Live Wire Networks Fixed Wireless | 250 / 100 |
May also be available: Lumen Technologies, T-Mobile USA.
Based on FCC filings for 66 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | EAST BOULDER COUNTY WD serves 300 people |
|---|---|
| Water Source | Purchased surface water from CITY OF LAFAYETTE |
| Last State Inspection | May 2025 |
| 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 | 4 last 3 years |
Results are for the whole water system as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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