Charles County, Maryland
19 ZIP codes · Avg score 66/100 · Grade C · Updated 2026-06-03
Across Charles County, EPA compliance data for 19 ZIP codes sits at a moderate level — not alarming, but not uniformly clean either.
How Charles County Compares
How Charles County Compares
Charles County scores 5 points above the Maryland state average (61/100) and 2 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Charles County, Maryland
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.1 (asthma 10.7%, diabetes 13.1%)
Estimated additional annual cost per homeowner: $2,434, driven primarily by sea_level
Infrastructure: 0.314% avg pipe failure probability, 6% of ZIPs at high risk
51.1% 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: $2,434
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
62,443 housing units in Charles 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 Charles County
Remediation costs are relatively manageable for most homeowners in Charles 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 Charles 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 Charles County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Swan Point | 945 | 24 |
| 2 | AQUALAND CAMPGROUND | 240 | 22 |
| 3 | Southview Wise | 61 | 22 |
| 4 | Thunderbird Motel | 60 | 22 |
| 5 | Matthews Manor | 45 | 22 |
24 total water systems serve Charles County.
All ZIP Codes in Charles County
19 ZIP codes tracked in Charles County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 20640 | Indian Head | 83 | B | 1 | $308K |
| 2 | 20622 | Charlotte Hall | 82 | B | 5 (1 health) | $416K |
| 3 | 20602 | Waldorf | 77 | B | 3 | $361K |
| 4 | 20604 | Waldorf | 77 | B | 3 | — |
| 5 | 20646 | La Plata | 77 | B | 2 | $435K |
| 6 | 20601 | Waldorf | 72 | B | 3 | $381K |
| 7 | 20603 | Waldorf | 72 | B | 3 | $431K |
| 8 | 20664 | Newburg | 72 | B | 22 (1 health) | $433K |
| 9 | 20658 | Marbury | 71 | B | 5 (1 health) | $290K |
| 10 | 20618 | Bushwood | 63 | C | 0 | $292K |
| 11 | 20621 | Chaptico | 63 | C | 0 | $563K |
| 12 | 20637 | Hughesville | 63 | C | 0 | $533K |
| 13 | 20662 | Nanjemoy | 63 | C | 0 | $382K |
| 14 | 20625 | Cobb Island | 55 | C | 0 | $244K |
| 15 | 20645 | Issue | 55 | C | 0 | $516K |
| 16 | 20659 | Mechanicsville | 55 | C | 0 | $388K |
| 17 | 20643 | Ironsides | 53 | D | 0 | — |
| 18 | 20661 | Mount Victoria | 53 | D | 0 | — |
| 19 | 20682 | Rock Point | 53 | D | 0 | — |
Recommended Buyer Guides for Charles County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Lead Paint Test Kits — 51.1% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Charles County, Maryland
Overview
Charles County in Maryland covers 19 ZIP codes with an average Home Safety Score of C (66/100).
9 of 19 ZIP codes have recorded EPA violations. 3 health-based violations have been documented.
← Back to Maryland 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.