Grimes County, Texas
9 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-03
Grimes County's tap water quality puts it in the upper tier nationally; the 9 ZIP codes here record few health-based violations.
How Grimes County Compares
How Grimes County Compares
Grimes County scores 10 points below the Texas state average (82/100) and 4 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Grimes County, Texas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.4 (asthma 10%, diabetes 13.6%)
Estimated additional annual cost per homeowner: $1,059, driven primarily by sea_level
Infrastructure: 0.286% avg pipe failure probability
38.6% of homes built before 1978 (lead paint era)
Violation History (2023–2025)
→ Stable trendEPA violation counts by year across Grimes County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 37 violations. Past 5 years: 53 total (53 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: $1,059
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
12,976 housing units in Grimes 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 Grimes County
Remediation costs are relatively manageable for most homeowners in Grimes 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 Grimes 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 Grimes County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Dobbin Plantersville Water Supply Corporation 2 | 2,766 | 63 |
| 2 | G & W Water Supply Corporation | 1,650 | 63 |
| 3 | Roans Prairie | 40 | 39 |
| 4 | Wickson Creek Special Utility District Grimes County | 4,843 | 39 |
| 5 | Anderson Water System | 226 | 39 |
19 total water systems serve Grimes County.
All ZIP Codes in Grimes County
9 ZIP codes tracked in Grimes County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 77868 | Navasota | 84 | B | 9 (1 health) | $200K |
| 2 | 77363 | Plantersville | 78 | B | 15 (1 health) | $345K |
| 3 | 77830 | Anderson | 75 | B | 39 (3 health) | $302K |
| 4 | 77831 | Bedias | 73 | B | 0 | $182K |
| 5 | 77873 | Richards | 73 | B | 0 | $208K |
| 6 | 77333 | Dobbin | 66 | C | 0 | — |
| 7 | 77875 | Roans Prairie | 66 | C | 0 | — |
| 8 | 77876 | Shiro | 66 | C | 0 | — |
| 9 | 77880 | Washington | 66 | C | 0 | $273K |
Recommended Buyer Guides for Grimes County
Federal and certification sources drive the ordering: EPA monitoring data, NSF certifications, FEMA flood maps, and CDC lead guidance — guides surface only when county data warrants them.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Grimes County, Texas
Overview
Grimes County in Texas covers 9 ZIP codes with an average Home Safety Score of B (72/100).
3 of 9 ZIP codes have recorded EPA violations. 5 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.