Grayson County, Texas
19 ZIP codes · Avg score 82/100 · Grade B · Updated 2026-06-03
Within Grayson County's 19 tracked ZIP codes, safety indicators remain above the national average with few health-based violations on record.
How Grayson County Compares
How Grayson County Compares
Grayson County scores 0 points above the Texas state average (82/100) and 14 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Grayson County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13 (asthma 10.3%, diabetes 12.3%)
Estimated additional annual cost per homeowner: $1,233, driven primarily by flood
Infrastructure: 0.298% avg pipe failure probability, 6% of ZIPs at high risk
44.7% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Grayson County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 27 violations. Past 5 years: 45 total (45 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $1,233
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
59,682 housing units in Grayson 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 Grayson County
Remediation costs are relatively manageable for most homeowners in Grayson 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 Grayson 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 Grayson County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Denison | 27,500 | 50 |
| 2 | City of Pottsboro | 2,571 | 43 |
| 3 | Thompson Heights Water System | 414 | 41 |
| 4 | Texoma Estates Water Supply Corporation | 216 | 37 |
| 5 | Rra Preston Shores Water System | 2,277 | 37 |
46 total water systems serve Grayson County.
All ZIP Codes in Grayson County
19 ZIP codes tracked in Grayson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 76264 | Sadler | 99 | A | 0 | $310K |
| 2 | 75021 | Denison | 94 | A | 2 | $189K |
| 3 | 76233 | Collinsville | 93 | A | 11 (2 health) | $228K |
| 4 | 75058 | Gunter | 91 | A | 2 | $467K |
| 5 | 75414 | Bells | 91 | A | 5 (1 health) | $223K |
| 6 | 75091 | Sherman | 90 | A | 4 | — |
| 7 | 75020 | Denison | 89 | A | 2 | $187K |
| 8 | 75489 | Tom Bean | 88 | A | 1 | $228K |
| 9 | 76271 | Tioga | 87 | A | 1 | $324K |
| 10 | 76273 | Whitesboro | 86 | A | 6 | $234K |
| 11 | 75495 | Van Alstyne | 85 | A | 12 | $354K |
| 12 | 75076 | Pottsboro | 81 | B | 37 (1 health) | $242K |
| 13 | 76245 | Gordonville | 77 | B | 6 (2 health) | $196K |
| 14 | 75090 | Sherman | 75 | B | 4 | $164K |
| 15 | 75092 | Sherman | 75 | B | 4 | $260K |
| 16 | 76485 | Peaster | 66 | C | 0 | — |
| 17 | 76487 | Poolville | 66 | C | 0 | $221K |
| 18 | 75459 | Howe | 65 | C | 0 | $249K |
| 19 | 76268 | Southmayd | 57 | C | 19 | $143K |
Recommended Buyer Guides for Grayson County
Editorial-only picks, screened against the EPA detections on file.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- 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 Grayson County, Texas
Overview
Grayson County in Texas covers 19 ZIP codes with an average Home Safety Score of B (82/100).
15 of 19 ZIP codes have recorded EPA violations. 6 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.