Miami County, Ohio
16 ZIP codes · Avg score 54/100 · Grade D · Updated 2026-06-03
Public water compliance in Miami County is below average — 16 ZIP codes, elevated violation rates.
How Miami County Compares
How Miami County Compares
Miami County scores 6 points below the Ohio state average (60/100) and 14 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Miami County, Ohio
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.8 (asthma 10.8%, diabetes 12.9%)
Estimated additional annual cost per homeowner: $1,154, driven primarily by energy_code_gap
Infrastructure: 0.435% avg pipe failure probability, 75% of ZIPs at high risk
77.7% of homes built before 1978 (lead paint era)
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: $1,154
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
47,151 housing units in Miami 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 Miami County
Remediation costs are relatively manageable for most homeowners in Miami 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 Miami 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 Miami County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Pleasant Hill Village Public Water System | 1,226 | 20 |
| 2 | TROY CITY PWS | 26,305 | 10 |
| 3 | Piqua City Public Water System | 20,354 | 10 |
| 4 | Miami Company-camp Troy Public Water System | 3,742 | 10 |
| 5 | Miami Company-n25a Extension | 2,367 | 10 |
24 total water systems serve Miami County.
All ZIP Codes in Miami County
16 ZIP codes tracked in Miami County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 45318 | Covington | 70 | B | 0 | $176K |
| 2 | 45326 | Fletcher | 70 | B | 0 | $149K |
| 3 | 45383 | West Milton | 68 | C | 1 | $149K |
| 4 | 45359 | Pleasant Hill | 66 | C | 1 | $187K |
| 5 | 45337 | Laura | 61 | C | 8 (1 health) | $226K |
| 6 | 45371 | Tipp City | 61 | C | 3 | $272K |
| 7 | 45374 | Troy | 59 | C | 5 | — |
| 8 | 45356 | Piqua | 58 | C | 5 | $145K |
| 9 | 45317 | Conover | 53 | D | 0 | $259K |
| 10 | 45373 | Troy | 53 | D | 5 | $234K |
| 11 | 45308 | Bradford | 47 | D | 6 | $165K |
| 12 | 45310 | Burkettsville | 40 | D | 0 | $189K |
| 13 | 45339 | Ludlow Falls | 40 | D | 0 | $233K |
| 14 | 45348 | New Weston | 40 | D | 0 | $227K |
| 15 | 45350 | North Star | 40 | D | 0 | — |
| 16 | 45361 | Potsdam | 40 | D | 0 | $117K |
Recommended Buyer Guides for Miami 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 Lead Paint Test Kits — 77.7% of homes built before 1978
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
Deep Dive Reports
Detailed analysis for Miami County, Ohio
Overview
Miami County in Ohio covers 16 ZIP codes with an average Home Safety Score of D (54/100).
8 of 16 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← Back to Ohio 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.
What You Can Do
Miami County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
77.7% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.