Boulder County, Colorado
31 ZIP codes · Avg score 59/100 · Grade C
ZipCheckup grade for Boulder County: C.
A mixed picture - some signals here are worth your attention.
ZipCheckup gives Boulder County a C; the county page lists 31 ZIP codes, each with its own report.
How Boulder County Compares
How Boulder County Compares
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData
ZIP Code Risk Map
Water Quality Map: Boulder County, Colorado
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 8.7 (asthma 10.3%, diabetes 7.1%)
Modeled additional annual cost estimate per homeowner: $1,279, largest modeled factor: Flood
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,279
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Boulder County
Modeled remediation costs in Boulder County can be compared with the median property value; actual costs vary by property.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Boulder County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems mapped to Boulder County ZIP codes
8 community water systems mapped to Boulder County ZIP codes; EPA may list more systems serving the county.
- D
- D
- D
- C
- D
- C
Show all 8 water systems
- D
- C
22 water systems mapped to Boulder County ZIP codes in our data; EPA may list more systems serving the county.
Systems with the most violations in Boulder County
5 water systems with violations in EPA records.
- D
- C
- D
- D
All ZIP Codes in Boulder County
31 ZIP codes tracked in Boulder County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 80302 | Boulder | 66 | C | 3 | $1124K |
| 2 | 80304 | Boulder | 66 | C | 3 | $1166K |
| 3 | 80466 | Nederland | 66 | C | 1 | $660K |
| 4 | 80501 | Longmont | 66 | C | 2 | $461K |
| 5 | 80027 | Louisville | 60 | C | 16 (4 health) | $823K |
| 6 | 80303 | Boulder | 60 | C | 17 (3 health) | $942K |
| 7 | 80305 | Boulder | 57 | C | 19 (11 health) | $986K |
| 8 | 80026 | Lafayette | 51 | D | 24 (3 health) | $664K |
| 9 | 80301 | Boulder | 50 | D | 82 (4 health) | $762K |
| 10 | 80503 | Longmont | 49 | D | 4 | $705K |
| 11 | 80025 | Eldorado Springs | — | — | 2 | $644K |
| 12 | 80028 | Louisville | — | — | — | |
| 13 | 80306 | Boulder | — | — | — | |
| 14 | 80307 | Boulder | — | — | — | |
| 15 | 80308 | Boulder | — | — | — | |
| 16 | 80309 | Boulder | — | — | — | |
| 17 | 80310 | Boulder | — | — | 2 | — |
| 18 | 80314 | Boulder | — | — | — | |
| 19 | 80321 | Boulder | — | — | — | |
| 20 | 80322 | Boulder | — | — | — | |
| 21 | 80323 | Boulder | — | — | — | |
| 22 | 80328 | Boulder | — | — | — | |
| 23 | 80329 | Boulder | — | — | — | |
| 24 | 80455 | Jamestown | — | — | $536K | |
| 25 | 80471 | Pinecliffe | — | — | — | |
| 26 | 80481 | Ward | — | — | $552K | |
| 27 | 80502 | Longmont | — | — | — | |
| 28 | 80510 | Allenspark | — | — | $772K | |
| 29 | 80533 | Hygiene | — | — | — | |
| 30 | 80540 | Lyons | — | — | 43 (26 health) | $788K |
| 31 | 80544 | Niwot | — | — | — |
Recommended Buyer Guides for Boulder County
These buyer guides are matched by rule rather than by hand - a PFAS record adds a PFAS filter guide, a lead action-level exceedance adds lead filter guides, a high share of pre-1978 homes adds lead paint test kits, EPA Radon Zone 1 add radon kits, and a top flood or wildfire risk adds related equipment.
- Water Filters Certified for PFAS Reduction — PFAS detected in 1 ZIP code
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Boulder County, Colorado
Overview
Boulder County in Colorado covers 31 tracked ZIP records with an average Home Safety Score of C (59/100) across 10 scored records.
13 of 13 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 45 health-based violations appear in the available health breakdown.
← Back to Colorado Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.