DeKalb County, Georgia
31 ZIP codes · Avg score 69/100 · Grade C · Updated 2026-06-03
Covering 31 ZIP codes, DeKalb County falls in the average tier for tap water safety — violations appear in a meaningful share of areas, and the data suggests quality depends heavily on which specific part of the county a household sits in.
How DeKalb County Compares
How DeKalb County Compares
DeKalb County scores 6 points below the Georgia state average (75/100) and 1 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: DeKalb County, Georgia
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.8 (asthma 10.4%, diabetes 13%)
Estimated additional annual cost per homeowner: $1,656, driven primarily by flood
Infrastructure: 0.296% avg pipe failure probability, 3% of ZIPs at high risk
58.8% of homes built before 1978 (lead paint era)
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $1,656
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
307,977 housing units in DeKalb 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 DeKalb County
Remediation costs are relatively manageable for most homeowners in DeKalb 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 DeKalb County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in DeKalb County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | DEKALB COUNTY | 743,000 | 60 |
| 2 | ATLANTA | 1,089,893 | 58 |
| 3 | Azalea Mobile Home Plaza | 300 | 56 |
| 4 | Plantation Inn Mobile Estates | 229 | 56 |
| 5 | Crawford County Estates | 167 | 56 |
9 total water systems serve DeKalb County.
All ZIP Codes in DeKalb County
31 ZIP codes tracked in DeKalb County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 30031 | Decatur | 86 | A | 1 | — |
| 2 | 30036 | Decatur | 86 | A | 1 | — |
| 3 | 30037 | Decatur | 86 | A | 1 | — |
| 4 | 30346 | Atlanta | 82 | B | 4 | $451K |
| 5 | 30035 | Decatur | 81 | B | 1 | $217K |
| 6 | 30322 | Atlanta | 81 | B | 4 | — |
| 7 | 31107 | Atlanta | 81 | B | 4 | — |
| 8 | 30030 | Decatur | 76 | B | 1 | $598K |
| 9 | 30032 | Decatur | 76 | B | 1 | $245K |
| 10 | 30034 | Decatur | 76 | B | 1 | $228K |
| 11 | 30307 | Atlanta | 76 | B | 4 | $704K |
| 12 | 30316 | Atlanta | 76 | B | 4 | $402K |
| 13 | 30317 | Atlanta | 76 | B | 4 | $511K |
| 14 | 30360 | Atlanta | 76 | B | 4 | $399K |
| 15 | 30033 | Decatur | 71 | B | 1 | $431K |
| 16 | 30306 | Atlanta | 71 | B | 4 | $797K |
| 17 | 30319 | Atlanta | 71 | B | 4 | $709K |
| 18 | 30329 | Atlanta | 71 | B | 4 | $484K |
| 19 | 30338 | Atlanta | 71 | B | 4 | $593K |
| 20 | 30340 | Atlanta | 71 | B | 4 | $313K |
| 21 | 30341 | Atlanta | 71 | B | 4 | $439K |
| 22 | 30345 | Atlanta | 71 | B | 4 | $529K |
| 23 | 30002 | Avondale Estates | 60 | C | 0 | $511K |
| 24 | 30072 | Pine Lake | 60 | C | 0 | $286K |
| 25 | 30021 | Clarkston | 52 | D | 0 | $256K |
| 26 | 30038 | Lithonia | 52 | D | 0 | $235K |
| 27 | 30088 | Stone Mountain | 52 | D | 0 | $208K |
| 28 | 30074 | Redan | 50 | D | 0 | — |
| 29 | 30079 | Scottdale | 50 | D | 0 | $280K |
| 30 | 30083 | Stone Mountain | 47 | D | 0 | $221K |
| 31 | 30087 | Stone Mountain | 47 | D | 0 | $312K |
Recommended Buyer Guides for DeKalb County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 58.8% of homes built before 1978
- 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 DeKalb County, Georgia
Overview
DeKalb County in Georgia covers 31 ZIP codes with an average Home Safety Score of C (69/100).
22 of 31 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← Back to Georgia water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.