Unicoi County, Tennessee
2 ZIP codes · Avg score 78/100 · Grade B · Updated 2026-06-04
In current tracking cycles, Unicoi County — spanning 2 ZIP codes — records above-average water quality outcomes; the county's compliance history over recent years shows few departures from federal standards.
How Unicoi County Compares
How Unicoi County Compares
Unicoi County scores 9 points above the Tennessee state average (69/100) and 10 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
Key Risk Factors
Health risk index: 16.9 (asthma 11.1%, diabetes 16.5%)
Estimated additional annual cost per homeowner: $1,480, driven primarily by flood
Infrastructure: 0.3% avg pipe failure probability
59% 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: $1,480
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
8,575 housing units in Unicoi 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 Unicoi County
Remediation costs are relatively manageable for most homeowners in Unicoi 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 Unicoi County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 4 systems in Unicoi County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Erwin Utilities Authority | 12,236 | 0 |
| 2 | Johnson City Water Department | 105,057 | 0 |
| 3 | Jonesborough Water Department | 33,069 | 0 |
| 4 | Unicoi Utility District | 4,527 | 0 |
All ZIP Codes in Unicoi County
2 ZIP codes tracked in Unicoi County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 37650 | Erwin | 78 | B | 0 | $156K |
| 2 | 37692 | Unicoi | 78 | B | 0 | $200K |
Recommended Buyer Guides for Unicoi County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 59% of homes built before 1978
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Overview
Unicoi County in Tennessee covers 2 ZIP codes with an average Home Safety Score of B (78/100).
No EPA violations recorded across any tracked ZIP codes in Unicoi County.
← Back to Tennessee 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.