Calvert County, Maryland
14 ZIP codes · Avg score 66/100 · Grade C · Updated
ZipCheckup grade for Calvert County: C.
A mixed picture - some signals here are worth your attention.
Across Calvert County's 14 ZIP codes, water safety results are uneven - a portion of systems carry active or recent violations, while others meet standards without issues.
How Calvert County Compares
How Calvert County Compares
Calvert County scores 3 points below the Maryland state average (69/100) and 7 points below the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: Calvert County, Maryland
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.4 (asthma 10.5%, diabetes 10.9%)
Estimated additional annual cost per homeowner: $3,045, driven primarily by flood
43.6% 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
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $3,045
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
36,588 housing units in Calvert 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 Calvert County
Remediation costs are relatively manageable for most homeowners in Calvert 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 Calvert County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Calvert County
8 community water systems serving Calvert County.
- C
- C
- C
- C
- C
- C
Show all 8 water systems
- C
- C
15 total water systems serve Calvert County.
Systems with the most violations in Calvert County
5 water systems with recorded EPA violations.
- C
- C
- C
- C
All ZIP Codes in Calvert County
14 ZIP codes tracked in Calvert County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 20629 | Dowell | 67 | C | 0 | $460K |
| 2 | 20688 | Solomons | 67 | C | 0 | — |
| 3 | 20657 | Lusby | 66 | C | 2 | $318K |
| 4 | 20678 | Prince Frederick | 66 | C | 2 | $428K |
| 5 | 20732 | Chesapeake Beach | 65 | C | 5 (1 health) | $426K |
| 6 | 20610 | Barstow | — | — | — | |
| 7 | 20615 | Broomes Island | — | — | $479K | |
| 8 | 20639 | Huntingtown | — | — | 1 | $528K |
| 9 | 20676 | Port Republic | — | — | 2 | $472K |
| 10 | 20685 | Saint Leonard | — | — | 2 | $431K |
| 11 | 20689 | Sunderland | — | — | 1 | $468K |
| 12 | 20714 | North Beach | — | — | 5 (1 health) | $363K |
| 13 | 20736 | Owings | — | — | 5 (1 health) | $571K |
| 14 | 20754 | Dunkirk | — | — | 0 | $601K |
Recommended Buyer Guides for Calvert 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 Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Calvert County, Maryland
Overview
Calvert County in Maryland covers 14 tracked ZIP records with an average Home Safety Score of C (66/100) across 5 scored records.
9 of 12 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 1 health-based violation appear in the available health breakdown.
← Back to Maryland Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.