Jones County, Iowa
10 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-06-03
Jones County: 10 ZIP codes, mid-range safety grade.
How Jones County Compares
How Jones County Compares
Jones County scores 4 points above the Iowa state average (59/100) and 5 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Jones County, Iowa
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.9 (asthma 9.8%, diabetes 11.9%)
Estimated additional annual cost per homeowner: $1,373, driven primarily by flood
Infrastructure: 0.52% avg pipe failure probability, 90% of ZIPs at high risk
75.6% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Jones County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 1 violation. Past 5 years: 2 total (2 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: $1,373
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
8,507 housing units in Jones 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 Jones County
Remediation costs are relatively manageable for most homeowners in Jones 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 Jones 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 Jones County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | MONTICELLO WATER SUPPLY | 4,040 | 119 |
| 2 | Bacon Addition | 81 | 119 |
| 3 | Montipark Llc | 60 | 119 |
| 4 | Olin Water Supply | 651 | 9 |
| 5 | Morley Municipal Water Supply | 98 | 8 |
14 total water systems serve Jones County.
All ZIP Codes in Jones County
10 ZIP codes tracked in Jones County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 52323 | Oxford Junction | 70 | B | 1 | $85K |
| 2 | 52312 | Morley | 67 | C | 3 | $77K |
| 3 | 52321 | Onslow | 66 | C | 1 | $121K |
| 4 | 52305 | Martelle | 65 | C | 2 | $163K |
| 5 | 52320 | Olin | 65 | C | 0 | $132K |
| 6 | 52310 | Monticello | 64 | C | 119 (1 health) | $193K |
| 7 | 52212 | Center Junction | 62 | C | 3 | $153K |
| 8 | 52205 | Anamosa | 61 | C | 5 (1 health) | $217K |
| 9 | 52362 | Wyoming | 60 | C | 4 | $130K |
| 10 | 52252 | Langworthy | 53 | D | 0 | $139K |
Recommended Buyer Guides for Jones 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 Lead Paint Test Kits — 75.6% of homes built before 1978
- 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 Jones County, Iowa
Overview
Jones County in Iowa covers 10 ZIP codes with an average Home Safety Score of C (63/100).
8 of 10 ZIP codes have recorded EPA violations. 2 health-based violations have been documented.
← Back to Iowa 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.