Johnson County, Tennessee
4 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
Compared to top-scoring counties, Johnson County's 4 ZIP codes land in the middle tier — some meet standards cleanly, others carry documented violations, and the gap between the best and worst areas is wider than average.
How Johnson County Compares
How Johnson County Compares
Johnson County scores 10 points below the Tennessee state average (69/100) and 9 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
Key Risk Factors
Health risk index: 17.6 (asthma 11.2%, diabetes 17.5%)
Estimated additional annual cost per homeowner: $1,048, driven primarily by energy_code_gap
Infrastructure: 0.34% avg pipe failure probability
64.8% 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: $1,048
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
7,222 housing units in Johnson 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 Johnson County
Remediation costs are relatively manageable for most homeowners in Johnson 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 Johnson County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 3 systems in Johnson County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | MOUNTAIN CITY WATER DEPT | 9,304 | 10 |
| 2 | Brownlow Utility District | 683 | 10 |
| 3 | Carderview Utility District | 1,130 | 10 |
All ZIP Codes in Johnson County
4 ZIP codes tracked in Johnson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 37683 | Mountain City | 66 | C | 10 | $175K |
| 2 | 37680 | Laurel Bloomery | 63 | C | 0 | $367K |
| 3 | 37688 | Shady Valley | 53 | D | 0 | $154K |
| 4 | 37691 | Trade | 53 | D | 0 | $283K |
Recommended Buyer Guides for Johnson County
Retailer arrangements don't shape what appears here — the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Lead Paint Test Kits — 64.8% of homes built before 1978
Overview
Johnson County in Tennessee covers 4 ZIP codes with an average Home Safety Score of C (59/100).
1 of 4 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.