Harford County, Maryland
15 ZIP codes · Avg score 49/100 · Grade D · Updated 2026-06-04
Although conditions vary by area, Harford County's 15 ZIP codes collectively show below-average water safety — health-based violations are documented throughout the county, and the overall grade reflects a pattern rather than isolated incidents.
How Harford County Compares
How Harford County Compares
Harford County scores 12 points below the Maryland state average (61/100) and 19 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Harford 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 10.3%, diabetes 11.7%)
Estimated additional annual cost per homeowner: $3,045, driven primarily by sea_level
Infrastructure: 0.351% avg pipe failure probability, 14% of ZIPs at high risk
58.7% of homes built before 1978 (lead paint era)
Violation History (2023–2024)
→ Stable trendEPA violation counts by year across Harford County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 5 violations. Past 5 years: 7 total (7 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: $3,045
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
96,417 housing units in Harford 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 Harford County
Remediation costs are relatively manageable for most homeowners in Harford 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 Harford 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 Harford County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Harford County D.p.w. | 104,567 | 10 |
| 2 | R & R Estates | 85 | 8 |
| 3 | Queens Castle Mobile Home Park | 60 | 8 |
| 4 | Clear View Mobile Home Park Llc | 28 | 8 |
| 5 | City of Aberdeen | 18,006 | 7 |
18 total water systems serve Harford County.
All ZIP Codes in Harford County
15 ZIP codes tracked in Harford County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 21154 | Street | 70 | B | 1 | $459K |
| 2 | 21009 | Abingdon | 64 | C | 2 | $335K |
| 3 | 21034 | Darlington | 62 | C | 8 (3 health) | $348K |
| 4 | 21001 | Aberdeen | 60 | C | 0 | $267K |
| 5 | 21014 | Bel Air | 57 | C | 1 | $408K |
| 6 | 21078 | Havre De Grace | 56 | C | 7 (1 health) | $356K |
| 7 | 21017 | Belcamp | 53 | D | 0 | $242K |
| 8 | 21040 | Edgewood | 45 | D | 0 | $231K |
| 9 | 21005 | Aberdeen Proving Ground | 40 | D | 0 | — |
| 10 | 21010 | Gunpowder | 40 | D | 0 | — |
| 11 | 21027 | Chase | 40 | D | 0 | — |
| 12 | 21085 | Joppa | 40 | D | 0 | $327K |
| 13 | 21130 | Perryman | 40 | D | 0 | — |
| 14 | 21156 | Upper Falls | 40 | D | 0 | $487K |
| 15 | 21122 | Pasadena | 35 | F | 0 | $412K |
Recommended Buyer Guides for Harford County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 58.7% of homes built before 1978
- 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
Deep Dive Reports
Detailed analysis for Harford County, Maryland
Overview
Harford County in Maryland covers 15 ZIP codes with an average Home Safety Score of D (49/100).
5 of 15 ZIP codes have recorded EPA violations. 4 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.
What You Can Do
Harford County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
58.7% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.