COUNTY REPORT MD

Baltimore County, Maryland

51 ZIP codes · Avg score 64/100 · Grade C

ZipCheckup grade for Baltimore County: C.

A mixed picture - some signals here are worth your attention.

For Baltimore County, the grade is neither top-tier nor bottom-tier; it summarizes data for 51 ZIP codes rather than measuring water at any home, and because it blends several sources, a middle result can come from very different mixes of strengths and weaknesses.

How Baltimore County Compares

Baltimore County64/100
Maryland avg69/100
National avg73/100

How Baltimore County Compares

C
County Grade
64/100
Avg Safety Score
51
ZIP Codes
5
Water Systems

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

C
County Grade
64
Avg Safety Score
51
ZIP Codes
Cockeysville
Best ZIP: 21030 (64/100)
Halethorpe
Lowest ZIP: 21227 (60/100)
$440K
Median Home Value
$656
Avg Remediation (0.15% of home value)

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.

A B C D F

Key Risk Factors

Health risk index: 12.6 (asthma 11%, diabetes 13.1%)

Modeled additional annual cost estimate per homeowner: $1,679, largest modeled factor: Flood

58% of homes built before 1980 (lead paint was banned for residential use in 1978)

County Health Indicators vs National Average

Asthma 11% (national: 8.9%)
Diabetes 13.1% (national: 10.5%)
Obesity 34% (national: 32.4%)

Black markers indicate national averages. Source: CDC PLACES, Census ACS.

Infrastructure Overview

1975
Median Build Year
58%
Pre-1980 Housing
43/100
Infrastructure Stress Indicator
66%
ZIPs with High Infrastructure Stress
Low
Lead Pipe Risk

Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINSA infrastructure needs, EPA SDWIS violations, and EPA lead indicators.

Compound Risk Breakdown

Estimated additional annual cost per homeowner: $1,679

Flood $1,200/yr
Energy Code Gap $486/yr
Sea Level Rise $422/yr

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

Pre-1940 7%
1940–1959 25%
1960–1979 26%
1980–1999 28%
2000+ 14%

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

$440K
Median Home Value
$656
Est. Remediation Cost
0.1%
of Home Value
Remediation as % of home value low burden

Modeled remediation costs in Baltimore County can be compared with the median property value; actual costs vary by property.

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

Asthma 11% (US avg: 8.9%)
Diabetes 13.1% (US avg: 11%)
Obesity 34% (US avg: 32.4%)

Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.

Water systems mapped to Baltimore County ZIP codes

5 community water systems mapped to Baltimore County ZIP codes; EPA may list more systems serving the county.

Systems with the most violations in Baltimore County

3 water systems with violations in EPA records.

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

Which guides appear depends on what the county data show.

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

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Frequently Asked Questions

Is water safe in Baltimore County?
Baltimore County receives a grade of C. Some ZIP codes have recorded violations and residents in affected areas may want to test their water.
How many water systems serve Baltimore County?
We map 5 public water systems to 51 ZIP codes in our data for Baltimore County. EPA may list more systems serving the county, so this is not a full count.
What is the biggest environmental risk in Baltimore County?
In ZipCheckup's cost model, the factor with the largest estimated average annual cost in Baltimore County is flood. Across all modeled risk factors, the estimated average additional annual cost is $1,679 per homeowner; actual costs vary by home.
How old are homes in Baltimore County?
The median home build year in Baltimore County is 1975. 58% of homes were built before 1980; homes built before 1978 may contain lead-based paint, and older homes may have older plumbing materials.
How does Baltimore County compare to Maryland?
Baltimore County has an average Home Safety Score of 64/100 under model 4.0.0, which is below the Maryland state average of 69/100.

How to cite this page

APA ZipCheckup. (2026). Baltimore County, MD: HSS 64/100; 3 Health Violations. https://zipcheckup.com/county/maryland/baltimore/
BibTeX 
@misc{zipcheckup-county-maryland-baltimore,
  author = {{ZipCheckup}},
  title  = {{Baltimore County, MD: HSS 64/100; 3 Health Violations}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/maryland/baltimore/}
}

Page version: October 2026.

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