Lonoke County, Arkansas
10 ZIP codes · Avg score 81/100 · Grade B · Updated 2026-06-03
Compared to state averages, Lonoke County scores well — its 10 ZIP codes sit above the baseline for tap water quality.
How Lonoke County Compares
How Lonoke County Compares
Lonoke County scores 5 points above the Arkansas state average (76/100) and 13 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Lonoke County, Arkansas
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.1 (asthma 10.4%, diabetes 12.3%)
Estimated additional annual cost per homeowner: $660, driven primarily by flood
Infrastructure: 0.314% avg pipe failure probability, 22% of ZIPs at high risk
45.7% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Lonoke County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 21 violations. Past 5 years: 27 total (27 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: $660
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
29,160 housing units in Lonoke 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 Lonoke County
Remediation costs are relatively manageable for most homeowners in Lonoke 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 Lonoke 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 Lonoke County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Grand Prairie Regional Water | 15,204 | 18 |
| 2 | Grand Prairie Bayou 2 Pwa | 13,519 | 13 |
| 3 | WARD WATERWORKS | 12,579 | 13 |
| 4 | Lonoke White Public Water Authority | — | 13 |
| 5 | Humnoke Waterworks | 292 | 13 |
18 total water systems serve Lonoke County.
All ZIP Codes in Lonoke County
10 ZIP codes tracked in Lonoke County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 72007 | Austin | 93 | A | 4 | $220K |
| 2 | 72023 | Cabot | 90 | A | 0 | $202K |
| 3 | 72024 | Carlisle | 87 | A | 0 | $132K |
| 4 | 72083 | Keo | 86 | A | 1 | — |
| 5 | 72072 | Humnoke | 85 | A | 13 (2 health) | $104K |
| 6 | 72086 | Lonoke | 85 | A | 5 (5 health) | $152K |
| 7 | 72176 | Ward | 83 | B | 4 (3 health) | $165K |
| 8 | 72168 | Tucker | 73 | B | 0 | $56K |
| 9 | 72037 | Coy | 66 | C | 0 | — |
| 10 | 72066 | Hickory Plains | 66 | C | 0 | — |
Recommended Buyer Guides for Lonoke 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
- 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 Lonoke County, Arkansas
Overview
Lonoke County in Arkansas covers 10 ZIP codes with an average Home Safety Score of B (81/100).
5 of 10 ZIP codes have recorded EPA violations. 10 health-based violations have been documented.
← Back to Arkansas 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.