Carroll County, Maryland
11 ZIP codes · Avg score 52/100 · Grade D · Updated
ZipCheckup grade for Carroll County: D.
Several federal signals point to home-safety risks in this ZIP.
Public water compliance in Carroll County is below average - 11 ZIP codes, elevated violation rates.
How Carroll County Compares
How Carroll County Compares
Carroll County scores 17 points below the Maryland state average (69/100) and 21 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: Carroll 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 10.1%, diabetes 10.3%)
Estimated additional annual cost per homeowner: $1,605, driven primarily by flood
60.5% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across Carroll County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 5 violations. Past 5 years: 6 total (6 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: $1,605
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
62,101 housing units in Carroll 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 Carroll County
Remediation costs are relatively manageable for most homeowners in Carroll 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 Carroll County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Carroll County
8 community water systems serving Carroll County.
- C
- D
- C
- D
- D
- D
Show all 8 water systems
12 total water systems serve Carroll County.
Systems with the most violations in Carroll County
5 water systems with recorded EPA violations.
- C
- C
- D
All ZIP Codes in Carroll County
11 ZIP codes tracked in Carroll County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 21784 | Sykesville | 63 | C | 8 (4 health) | $478K |
| 2 | 21074 | Hampstead | 50 | D | 0 | $350K |
| 3 | 21102 | Manchester | 50 | D | 0 | $375K |
| 4 | 21787 | Taneytown | 50 | D | 0 | $345K |
| 5 | 21157 | Westminster | 49 | D | 2 (1 health) | $394K |
| 6 | 21048 | Finksburg | — | — | 4 (1 health) | $424K |
| 7 | 21088 | Lineboro | — | — | — | |
| 8 | 21158 | Westminster | — | — | 3 (1 health) | $375K |
| 9 | 21757 | Keymar | — | — | 7 | $414K |
| 10 | 21776 | New Windsor | — | — | 1 | $434K |
| 11 | 21791 | Union Bridge | — | — | 0 | $370K |
Recommended Buyer Guides for Carroll County
Four sources - EPA, NSF, FEMA, CDC - drive the match.
- Best Lead Paint Test Kits — 60.5% 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
- 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 Carroll County, Maryland
Overview
Carroll County in Maryland covers 11 tracked ZIP records with an average Home Safety Score of D (52/100) across 5 scored records.
6 of 10 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 6 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.
What You Can Do
Carroll 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
60.5% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.