Montgomery County, Maryland
78 ZIP codes · Avg score 66/100 · Grade C · Updated
ZipCheckup grade for Montgomery County: C.
A mixed picture - some signals here are worth your attention.
Based on current EPA data, Montgomery County's 78 ZIP codes reflect fair but mixed water safety.
How Montgomery County Compares
How Montgomery County Compares
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 Last verified:
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.
Key Risk Factors
Health risk index: 10.2 (asthma 9.2%, diabetes 10.8%)
Estimated additional annual cost per homeowner: $2,475, driven primarily by sea_level
Violation History (2023–2024)
→ Stable trendEPA violation counts by year across Montgomery County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 6 violations. Past 5 years: 9 total (9 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: $2,475
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
Remediation costs are relatively manageable for most homeowners in Montgomery 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 Montgomery County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Montgomery County
5 community water systems serving Montgomery County.
- C
- C
- C
- C
Systems with the most violations in Montgomery County
3 water systems with recorded EPA violations.
- C
- C
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
Retailer arrangements don't shape what appears here - the selection logic is independent, filtered against EPA detections and the federal hazard data on file for this county.
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
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
- 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.