Collin County, Texas
32 ZIP codes · Avg score 91/100 · Grade A · Updated 2026-06-03
Throughout Collin County, the 32 monitored ZIP codes show low violation rates and healthy safety scores — a pattern that puts the county well above the state baseline for drinking water quality.
How Collin County Compares
How Collin County Compares
Collin County scores 9 points above the Texas state average (82/100) and 23 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Collin County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.3 (asthma 8.9%, diabetes 9.5%)
Estimated additional annual cost per homeowner: $567, driven primarily by flood
Infrastructure: 0.215% avg pipe failure probability
20.5% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Collin County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 18 violations. Past 5 years: 28 total (28 health-based).
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
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $567
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
381,147 housing units in Collin 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 Collin County
Remediation costs are relatively manageable for most homeowners in Collin 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 Collin County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Collin County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Caddo Basin Special Utility District | 14,574 | 38 |
| 2 | Verona Special Utility District | 3,672 | 38 |
| 3 | City of Blue Ridge | 1,189 | 38 |
| 4 | North Farmersville Water Supply Corporation | 747 | 38 |
| 5 | Frognot Special Utility District | 2,643 | 35 |
52 total water systems serve Collin County.
All ZIP Codes in Collin County
32 ZIP codes tracked in Collin County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 75025 | Plano | 99 | A | 1 | $467K |
| 2 | 75026 | Plano | 99 | A | 1 | — |
| 3 | 75086 | Plano | 99 | A | 1 | — |
| 4 | 75121 | Copeville | 99 | A | 0 | — |
| 5 | 75164 | Josephine | 97 | A | 1 | $229K |
| 6 | 75009 | Celina | 95 | A | 0 | $471K |
| 7 | 75013 | Allen | 95 | A | 0 | $561K |
| 8 | 75024 | Plano | 95 | A | 1 | $566K |
| 9 | 75071 | Mckinney | 95 | A | 1 | $449K |
| 10 | 75078 | Prosper | 95 | A | 1 | $651K |
| 11 | 75094 | Plano | 95 | A | 1 | $496K |
| 12 | 75166 | Lavon | 95 | A | 0 | $385K |
| 13 | 75407 | Princeton | 94 | A | 3 | $308K |
| 14 | 75033 | Frisco | 92 | A | 4 | $607K |
| 15 | 75035 | Frisco | 92 | A | 4 | $562K |
| 16 | 75409 | Anna | 91 | A | 9 (1 health) | $317K |
| 17 | 75424 | Blue Ridge | 91 | A | 3 (1 health) | $303K |
| 18 | 75023 | Plano | 90 | A | 1 | $386K |
| 19 | 75069 | Mckinney | 90 | A | 1 | $414K |
| 20 | 75070 | Mckinney | 90 | A | 1 | $429K |
| 21 | 75074 | Plano | 90 | A | 1 | $347K |
| 22 | 75093 | Plano | 90 | A | 1 | $623K |
| 23 | 75098 | Wylie | 88 | A | 1 | $363K |
| 24 | 75034 | Frisco | 87 | A | 4 | $680K |
| 25 | 75454 | Melissa | 87 | A | 2 (1 health) | $422K |
| 26 | 75485 | Westminster | 87 | A | 0 | — |
| 27 | 75002 | Allen | 85 | A | 0 | $404K |
| 28 | 75075 | Plano | 85 | A | 1 | $390K |
| 29 | 75252 | Dallas | 84 | B | 3 | $530K |
| 30 | 75097 | Weston | 83 | B | 8 (1 health) | — |
| 31 | 75173 | Nevada | 82 | B | 0 | $322K |
| 32 | 75442 | Farmersville | 81 | B | 23 (3 health) | $330K |
Recommended Buyer Guides for Collin County
Below: editorial picks, no sponsored placements.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Collin County, Texas
Overview
Collin County in Texas covers 32 ZIP codes with an average Home Safety Score of A (91/100).
25 of 32 ZIP codes have recorded EPA violations. 7 health-based violations have been documented.
← Back to Texas water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.