Cobb County, Georgia
57 ZIP codes · Avg score 57/100 · Grade C · Updated 2026-06-03
In recent monitoring cycles, Cobb County's 57 ZIP codes show a split record — several have documented water safety violations.
How Cobb County Compares
How Cobb County Compares
Cobb County scores 18 points below the Georgia state average (75/100) and 11 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Cobb County, Georgia
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 10.9 (asthma 9.4%, diabetes 10.9%)
Estimated additional annual cost per homeowner: $719, driven primarily by flood
Infrastructure: 0.244% avg pipe failure probability
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: $719
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 Cobb County
Remediation costs are relatively manageable for most homeowners in Cobb 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 Cobb 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 Cobb County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Atlanta | 1,089,893 | 112 |
| 2 | Azalea Mobile Home Plaza | 300 | 112 |
| 3 | Plantation Inn Mobile Estates | 229 | 112 |
| 4 | Crawford County Estates | 167 | 112 |
| 5 | Chance`s Mobile Home Park | 146 | 112 |
19 total water systems serve Cobb County.
All ZIP Codes in Cobb County
57 ZIP codes tracked in Cobb County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 30073 | Decatur | 69 | C | 1 | — |
| 2 | 30006 | Marietta | 66 | C | 0 | — |
| 3 | 30007 | Marietta | 66 | C | 0 | — |
| 4 | 30010 | Norcross | 66 | C | 5 | — |
| 5 | 30061 | Marietta | 66 | C | 0 | — |
| 6 | 30063 | Marietta | 66 | C | 0 | — |
| 7 | 30065 | Marietta | 66 | C | 0 | — |
| 8 | 30069 | Marietta | 66 | C | 0 | — |
| 9 | 30090 | Marietta | 66 | C | 0 | — |
| 10 | 30008 | Marietta | 65 | C | 0 | $270K |
| 11 | 30060 | Marietta | 65 | C | 0 | $282K |
| 12 | 30357 | Atlanta | 64 | C | 4 | — |
| 13 | 30062 | Marietta | 60 | C | 0 | $457K |
| 14 | 30064 | Marietta | 60 | C | 0 | $420K |
| 15 | 30066 | Marietta | 60 | C | 0 | $374K |
| 16 | 30068 | Marietta | 60 | C | 0 | $564K |
| 17 | 30301 | Atlanta | 60 | C | 4 | — |
| 18 | 30348 | Atlanta | 60 | C | 4 | — |
| 19 | 30355 | Atlanta | 60 | C | 4 | — |
| 20 | 30361 | Atlanta | 60 | C | 4 | — |
| 21 | 30364 | Atlanta | 60 | C | 4 | — |
| 22 | 30368 | Atlanta | 60 | C | 4 | — |
| 23 | 30369 | Atlanta | 60 | C | 4 | — |
| 24 | 30371 | Atlanta | 60 | C | 4 | — |
| 25 | 30375 | Atlanta | 60 | C | 4 | — |
| 26 | 30378 | Atlanta | 60 | C | 4 | — |
| 27 | 30380 | Atlanta | 60 | C | 4 | — |
| 28 | 30384 | Atlanta | 60 | C | 4 | — |
| 29 | 30385 | Atlanta | 60 | C | 4 | — |
| 30 | 30388 | Atlanta | 60 | C | 4 | — |
| 31 | 30396 | Atlanta | 60 | C | 4 | — |
| 32 | 30398 | Atlanta | 60 | C | 4 | — |
| 33 | 31106 | Atlanta | 60 | C | 4 | — |
| 34 | 31126 | Atlanta | 60 | C | 4 | — |
| 35 | 31131 | Atlanta | 60 | C | 4 | — |
| 36 | 31139 | Atlanta | 60 | C | 4 | — |
| 37 | 31150 | Atlanta | 60 | C | 4 | — |
| 38 | 31156 | Atlanta | 60 | C | 4 | — |
| 39 | 31192 | Atlanta | 60 | C | 4 | — |
| 40 | 31193 | Atlanta | 60 | C | 4 | — |
| 41 | 31195 | Atlanta | 60 | C | 4 | — |
| 42 | 31196 | Atlanta | 60 | C | 4 | — |
| 43 | 30082 | Smyrna | 57 | C | 0 | $393K |
| 44 | 30067 | Marietta | 55 | C | 0 | $431K |
| 45 | 30081 | Smyrna | 55 | C | 0 | — |
| 46 | 30080 | Smyrna | 52 | D | 0 | $410K |
| 47 | 30106 | Austell | 52 | D | 0 | $255K |
| 48 | 30339 | Atlanta | 49 | D | 4 | $437K |
| 49 | 30152 | Kennesaw | 45 | D | 0 | $385K |
| 50 | 30111 | Clarkdale | 40 | D | 0 | — |
| 51 | 30122 | Lithia Springs | 40 | D | 0 | $225K |
| 52 | 30126 | Mableton | 40 | D | 0 | $348K |
| 53 | 30127 | Powder Springs | 40 | D | 0 | $323K |
| 54 | 30144 | Kennesaw | 40 | D | 0 | $310K |
| 55 | 30156 | Kennesaw | 40 | D | 0 | — |
| 56 | 30160 | Kennesaw | 40 | D | 0 | — |
| 57 | 31144 | Kennesaw | 40 | D | 0 | — |
Recommended Buyer Guides for Cobb County
Independent picks. EPA-grounded. Matched here.
- 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 Cobb County, Georgia
Overview
Cobb County in Georgia covers 57 ZIP codes with an average Home Safety Score of C (57/100).
30 of 57 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.