Baltimore County, Maryland
51 ZIP codes · Avg score 64/100 · Grade C · Updated
ZipCheckup grade for Baltimore County: C.
A mixed picture - some signals here are worth your attention.
Water safety in Baltimore County is uneven - some of its 51 ZIP codes meet standards cleanly while others carry documented violations.
How Baltimore County Compares
How Baltimore County Compares
Baltimore County scores 5 points below the Maryland state average (69/100) and 9 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: Baltimore County, Maryland
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 12.6 (asthma 11%, diabetes 13.1%)
Estimated additional annual cost per homeowner: $1,873, driven primarily by flood
65.4% of homes built before 1978 (lead paint era)
Violation History (2022–2024)
→ Stable trendEPA violation counts by year across Baltimore County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 33 violations. Past 5 years: 48 total (48 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
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: $1,873
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
314,954 housing units in Baltimore 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 Baltimore County
Remediation costs are relatively manageable for most homeowners in Baltimore 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 Baltimore County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Baltimore County
5 community water systems serving Baltimore County.
- C
- C
- C
- C
Systems with the most violations in Baltimore County
3 water systems with recorded EPA violations.
- C
- C
- C
All ZIP Codes in Baltimore County
51 ZIP codes tracked in Baltimore County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 21030 | Cockeysville | 64 | C | 9 (2 health) | $436K |
| 2 | 21031 | Hunt Valley | 64 | C | 9 (2 health) | — |
| 3 | 21052 | Fort Howard | 64 | C | 9 (2 health) | $268K |
| 4 | 21071 | Glyndon | 64 | C | 9 (2 health) | $452K |
| 5 | 21117 | Owings Mills | 64 | C | 9 (2 health) | $371K |
| 6 | 21128 | Perry Hall | 64 | C | 9 (2 health) | $424K |
| 7 | 21131 | Phoenix | 64 | C | 9 (2 health) | $663K |
| 8 | 21133 | Randallstown | 64 | C | 9 (2 health) | $302K |
| 9 | 21136 | Reisterstown | 64 | C | 9 (2 health) | $380K |
| 10 | 21162 | White Marsh | 64 | C | 9 (2 health) | $463K |
| 11 | 21204 | Towson | 64 | C | 9 (2 health) | $572K |
| 12 | 21208 | Pikesville | 64 | C | 9 (2 health) | $313K |
| 13 | 21219 | Sparrows Point | 64 | C | 9 (2 health) | $371K |
| 14 | 21220 | Middle River | 64 | C | 9 (2 health) | $280K |
| 15 | 21221 | Essex | 64 | C | 9 (2 health) | $267K |
| 16 | 21222 | Dundalk | 64 | C | 9 (2 health) | $201K |
| 17 | 21228 | Catonsville | 64 | C | 9 (2 health) | $389K |
| 18 | 21234 | Parkville | 64 | C | 9 (2 health) | $276K |
| 19 | 21236 | Nottingham | 64 | C | 9 (2 health) | $307K |
| 20 | 21237 | Rosedale | 64 | C | 9 (2 health) | $280K |
| 21 | 21244 | Windsor Mill | 64 | C | 9 (2 health) | $271K |
| 22 | 21250 | Baltimore | 64 | C | 9 (2 health) | — |
| 23 | 21251 | Baltimore | 64 | C | 9 (2 health) | — |
| 24 | 21286 | Towson | 64 | C | 9 (2 health) | $402K |
| 25 | 21087 | Kingsville | 63 | C | 12 (2 health) | $505K |
| 26 | 21227 | Halethorpe | 60 | C | 18 (3 health) | $272K |
| 27 | 21013 | Baldwin | — | — | $578K | |
| 28 | 21020 | Boring | — | — | — | |
| 29 | 21022 | Brooklandville | — | — | — | |
| 30 | 21023 | Butler | — | — | $625K | |
| 31 | 21027 | Chase | — | — | — | |
| 32 | 21051 | Fork | — | — | $563K | |
| 33 | 21053 | Freeland | — | — | $445K | |
| 34 | 21057 | Glen Arm | — | — | 9 (2 health) | $609K |
| 35 | 21065 | Hunt Valley | — | — | — | |
| 36 | 21082 | Hydes | — | — | $525K | |
| 37 | 21092 | Long Green | — | — | — | |
| 38 | 21093 | Lutherville Timonium | — | — | 9 (2 health) | $466K |
| 39 | 21105 | Maryland Line | — | — | — | |
| 40 | 21111 | Monkton | — | — | 9 (2 health) | $585K |
| 41 | 21120 | Parkton | — | — | $552K | |
| 42 | 21139 | Riderwood | — | — | — | |
| 43 | 21152 | Sparks Glencoe | — | — | 9 (2 health) | $529K |
| 44 | 21153 | Stevenson | — | — | 9 (2 health) | $988K |
| 45 | 21155 | Upperco | — | — | 0 | $538K |
| 46 | 21156 | Upper Falls | — | — | $487K | |
| 47 | 21252 | Towson | — | — | 9 (2 health) | — |
| 48 | 21282 | Baltimore | — | — | — | |
| 49 | 21284 | Baltimore | — | — | — | |
| 50 | 21285 | Baltimore | — | — | 9 (2 health) | — |
| 51 | 21298 | Baltimore | — | — | — |
Recommended Buyer Guides for Baltimore County
Four sources - EPA, NSF, FEMA, CDC - drive the match.
- Best Lead Paint Test Kits — 65.4% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- 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 Baltimore County, Maryland
Overview
Baltimore County in Maryland covers 51 tracked ZIP records with an average Home Safety Score of C (64/100) across 26 scored records.
33 of 34 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 3 health-based violations 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.