Boulder County property record for 115 31st St, Boulder, CO 80305
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 800 sqft · built 1955 |
| Lot Size | 0.24 acres (10,463 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $136,000 (Nov 1993) |
| Tax Bill | $3,945 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1577-05-3-18-024 |
| Primary APN | 1577-05-3-18-024 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 4 Rooms |
| Stories | 1 Story |
| Building Area | 800 sqft Living Area |
| Gross Area | 1,056 sqft |
| 1st Floor Area | 800 sqft |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1955 |
|---|---|
| Effective Year Built | Effective 1978 |
| Architectural Style | Ranch |
| Exterior Material | Brick Veneer |
| Construction Type | Masonry / Concrete Block |
| Roof Material | Asphalt |
| Lot Area | 10,463 sqft (0.24 acres) |
| Garage Type | Attached |
| Garage Area | 256 sqft |
| Parking Spaces | 1 Parking Space |
| Deck Area | 80 sqft |
| Patio Area | 200 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | R0005615 |
|---|---|
| Street Address | 115 31ST ST |
| City | BOULDER |
| State | CO |
| Zip | 80305 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT 29 BLK 15 HIGHLAND PARK 3 |
| Legal Range | 70 |
| Legal Township | 1S |
| Legal Section | 05 |
| Legal Subdivision | HIGHLAND PARK 3 - BO |
| Legal Block | 15 |
| Legal Lot Number | 29 |
| Jurisdiction | BOULDER CO |
| Township / Civil Division | BOULDER |
| Census Block Group | 2 |
| Census Block | 2011 |
| Census Tract | 12507 |
Source: Boulder County records, as of June 15, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on Record |
|---|---|
| Mailing Address | 115 S 31ST ST, BOULDER, CO 80305-3408 |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Nov 24, 1993 · Amount on Record |
| Deed Sale | Nov 24, 1993 · Amount on Record |
| Prior Sale | Dec 31, 1986 · Amount on Record |
| Deed Document Number | 19931365137 |
| Record Updated | Sep 20, 2026 |
Source: Boulder County assessment roll, as of June 15, 2026
| Type | Name |
|---|---|
| State | Colorado |
| County | Boulder County |
| Municipality | Boulder City |
| Unified School District | Boulder Valley School District RE-2 (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $51,816 (+8.8%) Land $37,910 Building $13,906 | $762,000 (-) Land $557,500 Building $204,500 | |
| 2025 | $3,945.00 (+6.56%) | $47,625 (-10.58%) Land $34,844 Building $12,781 | $762,000 (-4.14%) Land $557,500 Building $204,500 |
| 2023 | $3,702.00 (+10.77%) | $53,259 (+24.02%) Land $40,991 Building $12,268 | $794,905 (+28.65%) Land $611,800 Building $183,105 |
| 2022 | $3,342.00 | $42,944 Land $31,046 Building $11,898 | $617,900 Land $446,700 Building $171,200 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
Source: FEMA National Flood Hazard Layer, effective October 14, 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 |
| Community Rating System | Class 5 (25% premium discount) |
| Nearby Flood Policies | 9 in force |
| Nearby Flood Claims | 1 (2013) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides |
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 | Moderate above 59% of the US · above 44% of Colorado |
|---|---|
| Wildfire Likelihood | 0.2% 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 BOULDER serves 166,080 people · EPA ID CO0107152 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Sep 2024 |
| Lead | 2 ppb (2023–2025) action level 15 ppb |
| Water Quality | Haloacetic acids resolved · Jul 2017 |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 1 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 294 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Ayva Networks Fixed Wireless | 2,500 / 2,500 |
| CenturyLink Fiber | 2,000 / 1,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| LiveWireNet Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
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