Washington County, Tennessee
12 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-06-03
Monitoring figures for Washington County indicate average water quality overall — some ZIP codes among the 12 tracked have recorded health-based violations, while others operate cleanly, making individual ZIP-level data the most actionable reference point.
How Washington County Compares
How Washington County Compares
Washington County scores 14 points below the Tennessee state average (69/100) and 13 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Washington County, Tennessee
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.5 (asthma 11%, diabetes 13.4%)
Estimated additional annual cost per homeowner: $763, driven primarily by flood
Infrastructure: 0.259% avg pipe failure probability, 9% of ZIPs at high risk
48.8% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Washington County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 5 violations. Past 5 years: 8 total (8 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: $763
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
64,903 housing units in Washington 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 Washington County
Remediation costs are relatively manageable for most homeowners in Washington 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 Washington 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 Washington County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Johnson City Water Department | 105,057 | 13 |
| 2 | Jonesborough Water Department | 33,069 | 5 |
| 3 | Elizabethton Water Department | 32,490 | 4 |
| 4 | KINGSPORT WATER DEPT | 106,765 | 3 |
| 5 | South Elizabethton U.d. | 6,154 | 2 |
11 total water systems serve Washington County.
All ZIP Codes in Washington County
12 ZIP codes tracked in Washington County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 37605 | Johnson City | 66 | C | 2 | — |
| 2 | 37615 | Johnson City | 66 | C | 2 | $261K |
| 3 | 37659 | Jonesborough | 64 | C | 1 (1 health) | $242K |
| 4 | 37602 | Johnson City | 62 | C | 2 | — |
| 5 | 37614 | Johnson City | 62 | C | 2 | — |
| 6 | 37601 | Johnson City | 56 | C | 2 | $187K |
| 7 | 37604 | Johnson City | 56 | C | 2 | $232K |
| 8 | 37657 | Flag Pond | 53 | D | 0 | $214K |
| 9 | 37681 | Limestone | 53 | D | 0 | $170K |
| 10 | 37682 | Milligan College | 40 | D | 0 | — |
| 11 | 37684 | Mountain Home | 40 | D | 0 | — |
| 12 | 37690 | Telford | 40 | D | 0 | $221K |
Recommended Buyer Guides for Washington 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 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 Washington County, Tennessee
Overview
Washington County in Tennessee covers 12 ZIP codes with an average Home Safety Score of C (55/100).
7 of 12 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← 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.