COUNTY REPORT MD

Montgomery County, Maryland

78 ZIP codes · Avg score 66/100 · Grade C

ZipCheckup grade for Montgomery County: C.

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

Montgomery County receives a C, the middle grade on the A-F scale, with 78 ZIP codes tracked.

How Montgomery County Compares

Montgomery County66/100
Maryland avg69/100
National avg73/100

How Montgomery County Compares

C
County Grade
66/100
Avg Safety Score
78
ZIP Codes
5
Water Systems

Montgomery 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

C
County Grade
66
Avg Safety Score
78
ZIP Codes
Glen Echo
Best ZIP: 20812 (67/100)
Poolesville
Lowest ZIP: 20837 (50/100)
$668K
Median Home Value
$500
Avg Remediation (0.07% of home value)

ZIP Code Risk Map

Water Quality Map: Montgomery 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: 10.2 (asthma 9.2%, diabetes 10.8%)

Modeled additional annual cost estimate per homeowner: $1,182, largest modeled factor: Flood

County Health Indicators vs National Average

Asthma 9.2% (national: 8.9%)
Diabetes 10.8% (national: 10.5%)
Obesity 26.1% (national: 32.4%)

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

Infrastructure Overview

42/100
Infrastructure Stress Indicator
49%
ZIPs with High Infrastructure Stress

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: $1,182

Flood $710/yr
Sea Level Rise $400/yr
Energy Code Gap $387/yr

Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).

Water Safety Affordability

How much it costs to fix water issues relative to home values in Montgomery County

$668K
Median Home Value
$500
Est. Remediation Cost
0.1%
of Home Value
Remediation as % of home value low burden

Modeled remediation costs in Montgomery 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 Montgomery County residents

Asthma 9.2% (US avg: 8.9%)
Diabetes 10.8% (US avg: 11%)
Obesity 26.1% (US avg: 32.4%)

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

Water systems mapped to Montgomery County ZIP codes

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

Systems with the most violations in Montgomery County

3 water systems with violations in EPA records.

All ZIP Codes in Montgomery County

78 ZIP codes tracked in Montgomery County.

# ZIP Code City Safety Score Grade Violations Home Value
1 20812 Glen Echo 67 C 0 $1129K
2 20814 Bethesda 67 C 0 $977K
3 20815 Chevy Chase 67 C 0 $1231K
4 20816 Bethesda 67 C 0 $1166K
5 20817 Bethesda 67 C 0 $1142K
6 20818 Cabin John 67 C 0 $1273K
7 20832 Olney 67 C 0 $601K
8 20833 Brookeville 67 C 0 $762K
9 20860 Sandy Spring 67 C 0 $665K
10 20861 Ashton 67 C 0 $956K
11 20866 Burtonsville 67 C 0 $434K
12 20868 Spencerville 67 C 0 $565K
13 20871 Clarksburg 67 C 0 $629K
14 20872 Damascus 67 C 0 $478K
15 20874 Germantown 67 C 0 $385K
16 20876 Germantown 67 C 0 $457K
17 20877 Gaithersburg 67 C 0 $463K
18 20878 Gaithersburg 67 C 0 $675K
19 20879 Gaithersburg 67 C 0 $434K
20 20880 Washington Grove 67 C 0 $594K
21 20882 Gaithersburg 67 C 0 $706K
22 20886 Montgomery Village 67 C 0 $366K
23 20892 Bethesda 67 C 0 —
24 20895 Kensington 67 C 0 $744K
25 20896 Garrett Park 67 C 0 $994K
26 20901 Silver Spring 67 C 0 $571K
27 20902 Silver Spring 67 C 0 $531K
28 20903 Silver Spring 67 C 0 $468K
29 20904 Silver Spring 67 C 0 $534K
30 20905 Silver Spring 67 C 0 $640K
31 20906 Silver Spring 67 C 0 $441K
32 20910 Silver Spring 67 C 0 $691K
33 20912 Takoma Park 67 C 0 $671K
34 20841 Boyds 66 C 2 $771K
35 20850 Rockville 61 C 16 $687K
36 20851 Rockville 61 C 16 $524K
37 20852 Rockville 61 C 16 $646K
38 20853 Rockville 61 C 16 $606K
39 20854 Potomac 61 C 16 $1105K
40 20855 Derwood 61 C 16 $615K
41 20837 Poolesville 50 D 2 $701K
42 20753 District Heights — — —
43 20810 Bethesda — — —
44 20811 Bethesda — — —
45 20813 Bethesda — — —
46 20824 Bethesda — — —
47 20825 Chevy Chase — — —
48 20827 Bethesda — — —
49 20830 Olney — — —
50 20838 Barnesville — — $807K
51 20839 Beallsville — — $900K
52 20842 Dickerson — — 4 $709K
53 20847 Rockville — — —
54 20848 Rockville — — —
55 20849 Rockville — — —
56 20857 Rockville — — —
57 20859 Potomac — — —
58 20862 Brinklow — — 0 $804K
59 20875 Germantown — — —
60 20883 Gaithersburg — — —
61 20884 Gaithersburg — — —
62 20885 Gaithersburg — — —
63 20889 Bethesda — — 0 —
64 20891 Kensington — — —
65 20894 Bethesda — — 0 —
66 20897 Suburb Maryland Fac — — —
67 20898 Gaithersburg — — —
68 20899 Gaithersburg — — 0 —
69 20907 Silver Spring — — —
70 20908 Silver Spring — — —
71 20911 Silver Spring — — —
72 20913 Takoma Park — — —
73 20914 Silver Spring — — —
74 20915 Silver Spring — — —
75 20916 Silver Spring — — —
76 20918 Silver Spring — — —
77 20993 Silver Spring — — —
78 20997 Silver Spring — — —

Recommended Buyer Guides for Montgomery County

The guides listed here are chosen from this county's data, and the short note beside each one says why it made the list.

Deep Dive Reports

Detailed analysis for Montgomery County, Maryland

Overview

Montgomery County in Maryland covers 78 tracked ZIP records with an average Home Safety Score of C (66/100) across 41 scored records.

9 of 46 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. The available record reports no health-based violations for this measured scope.

← 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 Montgomery County?
Montgomery 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 Montgomery County?
We map 5 public water systems to 78 ZIP codes in our data for Montgomery County. EPA may list more systems serving the county, so this is not a full count.
What is the biggest environmental risk in Montgomery County?
In ZipCheckup's cost model, the factor with the largest estimated average annual cost in Montgomery County is flood. Across all modeled risk factors, the estimated average additional annual cost is $1,182 per homeowner; actual costs vary by home.
How does Montgomery County compare to Maryland?
Montgomery County has an average Home Safety Score of 66/100 under model 4.0.0, which is below the Maryland state average of 69/100.

How to cite this page

APA ZipCheckup. (2026). Montgomery County, MD: HSS 66/100; 20 Violations. https://zipcheckup.com/county/maryland/montgomery/
BibTeX 
@misc{zipcheckup-county-maryland-montgomery,
  author = {{ZipCheckup}},
  title  = {{Montgomery County, MD: HSS 66/100; 20 Violations}},
  year   = {2026},
  url    = {https://zipcheckup.com/county/maryland/montgomery/}
}

Page version: October 2026.

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