Weld County, Colorado
40 ZIP codes · Avg score 48/100 · Grade D · Updated
ZipCheckup grade for Weld County: D.
Several federal signals point to home-safety risks in this ZIP.
Your top priority: see the breakdown below and consider a certified water filter. NSF certified filters →
While Weld County's situation varies by ZIP, its 40 ZIP codes collectively fall below the state average - addressing specific concerns starts with checking the system that serves a given address.
How Weld County Compares
How Weld County Compares
Weld County scores 11 points below the Colorado state average (59/100) and 25 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: Weld County, Colorado
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.2 (asthma 10.7%, diabetes 9.5%)
Estimated additional annual cost per homeowner: $971, driven primarily by flood
45.9% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↓ Improving trendEPA violation counts by year across Weld County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 8 violations. Past 5 years: 20 total (20 health-based). Health-based violations are declining versus the prior 2-year window.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
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 DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $971
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
144,016 housing units in Weld County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Weld County
Remediation costs are relatively manageable for most homeowners in Weld County, representing a small fraction of property value.
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 Weld County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Weld County
8 community water systems serving Weld County.
- D
- D
- F
- F
- D
- F
Show all 8 water systems
- D
- D
30 total water systems serve Weld County.
Systems with the most violations in Weld County
5 water systems with recorded EPA violations.
- D
- F
- D
- D
- F
All ZIP Codes in Weld County
40 ZIP codes tracked in Weld County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 80624 | Gill | 58 | C | 2 | $482K |
| 2 | 80644 | Kersey | 58 | C | 2 | $387K |
| 3 | 80642 | Hudson | 57 | C | 3 | $568K |
| 4 | 80520 | Firestone | 56 | C | 5 | $449K |
| 5 | 80530 | Frederick | 56 | C | 5 | $449K |
| 6 | 80610 | Ault | 56 | C | 8 | $403K |
| 7 | 80620 | Evans | 56 | C | 8 | $315K |
| 8 | 80650 | Pierce | 56 | C | 8 | $311K |
| 9 | 80514 | Dacono | 54 | D | 9 (1 health) | $448K |
| 10 | 80634 | Greeley | 53 | D | 16 | $405K |
| 11 | 80612 | Carr | 52 | D | 17 (2 health) | $608K |
| 12 | 80516 | Erie | 50 | D | 20 (1 health) | $684K |
| 13 | 80631 | Greeley | 50 | D | 23 (1 health) | $300K |
| 14 | 80615 | Eaton | 49 | D | 28 (1 health) | $489K |
| 15 | 80645 | La Salle | 49 | D | 26 | $404K |
| 16 | 80542 | Mead | 42 | D | 0 | $591K |
| 17 | 80621 | Fort Lupton | 42 | D | 60 (6 health) | $426K |
| 18 | 80603 | Brighton | 41 | D | 2 (1 health) | $449K |
| 19 | 80543 | Milliken | 36 | F | 17 (1 health) | $404K |
| 20 | 80504 | Longmont | 35 | F | 17 | $557K |
| 21 | 80534 | Johnstown | 35 | F | 20 (1 health) | $510K |
| 22 | 80651 | Platteville | 34 | F | 20 | $438K |
| 23 | 80550 | Windsor | 31 | F | 28 (1 health) | $539K |
| 24 | 80546 | Severance | — | — | — | |
| 25 | 80551 | Windsor | — | — | — | |
| 26 | 80611 | Briggsdale | — | — | $419K | |
| 27 | 80622 | Galeton | — | — | — | |
| 28 | 80623 | Gilcrest | — | — | $287K | |
| 29 | 80632 | Greeley | — | — | — | |
| 30 | 80633 | Greeley | — | — | — | |
| 31 | 80638 | Greeley | — | — | — | |
| 32 | 80639 | Greeley | — | — | — | |
| 33 | 80643 | Keenesburg | — | — | $455K | |
| 34 | 80646 | Lucerne | — | — | — | |
| 35 | 80648 | Nunn | — | — | $394K | |
| 36 | 80652 | Roggen | — | — | $473K | |
| 37 | 80729 | Grover | — | — | 1 | $254K |
| 38 | 80732 | Hereford | — | — | $114K | |
| 39 | 80742 | New Raymer | — | — | $238K | |
| 40 | 80754 | Stoneham | — | — | $235K |
Recommended Buyer Guides for Weld County
While many sites publish identical guide lists across every county they cover, the selection here changes by location - driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Water Filters for PFAS — 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 Weld County, Colorado
Overview
Weld County in Colorado covers 40 tracked ZIP records with an average Home Safety Score of D (48/100) across 23 scored records.
23 of 24 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 11 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.
What You Can Do
Weld County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
45.9% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.