Jefferson County, Washington
7 ZIP codes · Avg score 81/100 · Grade B · Updated 2026-06-03
Recent water monitoring in Jefferson County shows 7 ZIP codes with consistently safe results.
How Jefferson County Compares
How Jefferson County Compares
Jefferson County scores 3 points above the Washington state average (78/100) and 13 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Jefferson County, Washington
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.2 (asthma 10.8%, diabetes 12%)
Estimated additional annual cost per homeowner: $1,550, driven primarily by sea_level
Infrastructure: 0.376% avg pipe failure probability, 14% of ZIPs at high risk
49.4% 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: $1,550
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
16,853 housing units in Jefferson 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 Jefferson County
Remediation costs are relatively manageable for most homeowners in Jefferson 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 Jefferson 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 Jefferson County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | OLYMPIC WATER & SEWER INC | 3,086 | 13 |
| 2 | Quimper | 14,500 | 11 |
| 3 | Bridgehaven Community Club | 623 | 6 |
| 4 | Jefferson County Water District #1 | 600 | 6 |
| 5 | City of Port Townsend | 16,977 | 5 |
13 total water systems serve Jefferson County.
All ZIP Codes in Jefferson County
7 ZIP codes tracked in Jefferson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 98325 | Chimacum | 96 | A | 3 | $468K |
| 2 | 98376 | Quilcene | 93 | A | 4 | $376K |
| 3 | 98368 | Port Townsend | 89 | A | 2 | $512K |
| 4 | 98365 | Port Ludlow | 87 | A | 6 | $604K |
| 5 | 98364 | Port Gamble | 73 | B | 0 | — |
| 6 | 98350 | La Push | 66 | C | 0 | $58K |
| 7 | 98340 | Hansville | 65 | C | 0 | $461K |
Recommended Buyer Guides for Jefferson County
Independent picks. EPA-grounded. Matched here.
- Best Water Testing Kits — Baseline water quality check for your ZIP
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant peace of mind
Deep Dive Reports
Detailed analysis for Jefferson County, Washington
Overview
Jefferson County in Washington covers 7 ZIP codes with an average Home Safety Score of B (81/100).
4 of 7 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Washington 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.