Washington County, Minnesota
20 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-06-03
Safe water is the norm for most of Washington County's 20 ZIP codes — but a notable subset have documented violations that push the grade to the middle tier.
How Washington County Compares
How Washington County Compares
Washington County scores 7 points below the Minnesota state average (62/100) 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, Minnesota
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.1 (asthma 9.5%, diabetes 10.3%)
Estimated additional annual cost per homeowner: $1,402, driven primarily by flood
Infrastructure: 0.353% avg pipe failure probability, 26% of ZIPs at high risk
58.3% of homes built before 1978 (lead paint era)
Violation History (2023–2025)
→ Stable trendEPA violation counts by year across Washington County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 8 violations. Past 5 years: 15 total (15 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: $1,402
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
142,326 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 | Wyoming | 3,990 | 12 |
| 2 | Preserve at Birch Lake | 388 | 12 |
| 3 | Scandia Water Company | 35 | 11 |
| 4 | Hilltop Water Company | 25 | 11 |
| 5 | Woodlund Mobile Home Park | 330 | 5 |
22 total water systems serve Washington County.
All ZIP Codes in Washington County
20 ZIP codes tracked in Washington County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 55016 | Cottage Grove | 70 | B | 1 | $359K |
| 2 | 55025 | Forest Lake | 70 | B | 1 | $386K |
| 3 | 55055 | Newport | 65 | C | 0 | $331K |
| 4 | 55083 | Stillwater | 65 | C | 2 | — |
| 5 | 55082 | Stillwater | 64 | C | 2 | $460K |
| 6 | 55042 | Lake Elmo | 63 | C | 1 | $594K |
| 7 | 55043 | Lakeland | 60 | C | 1 | $361K |
| 8 | 55073 | Scandia | 60 | C | 11 | $470K |
| 9 | 55075 | South Saint Paul | 53 | D | 0 | $267K |
| 10 | 55090 | Willernie | 53 | D | 1 | $305K |
| 11 | 55115 | Saint Paul | 53 | D | 0 | $482K |
| 12 | 55119 | Saint Paul | 53 | D | 0 | $263K |
| 13 | 55125 | Saint Paul | 53 | D | 0 | $397K |
| 14 | 55128 | Saint Paul | 53 | D | 0 | $301K |
| 15 | 55003 | Bayport | 52 | D | 1 | $363K |
| 16 | 55001 | Afton | 45 | D | 0 | $654K |
| 17 | 55107 | Saint Paul | 45 | D | 0 | $260K |
| 18 | 55110 | Saint Paul | 45 | D | 0 | $347K |
| 19 | 55129 | Saint Paul | 40 | D | 0 | $518K |
| 20 | 55146 | Saint Paul | 40 | D | 0 | — |
Recommended Buyer Guides for Washington County
Editorial methodology pairs each documented risk in this county with the buyer category that addresses it, drawing on water-quality detections, housing-stock lead exposure, EPA Radon Zone designation, and FEMA flood and wildfire ratings. NSF-certified options surface where applicable, and products that match the specific contaminant take priority.
- Best Lead Paint Test Kits — 58.3% of homes built before 1978
- 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, Minnesota
Overview
Washington County in Minnesota covers 20 ZIP codes with an average Home Safety Score of C (55/100).
9 of 20 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Minnesota 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.