Marietta, GA: High Radon Risk — 63/100 (2026)
14 ZIP codes · 8 water systems · Updated 2026-06-03
Safe water is the norm across most of Marietta, GA — but documented violations push the city to the middle safety tier.
How Marietta Compares
Data: EPA SDWIS Last verified: 2026-06-03
Water Quality Map: Marietta, GA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Score Distribution
How ZIP codes in Marietta score across all safety grades.
What You Should Know About Marietta Water
- Average lead level: 0.0011 mg/L.
- Estimated remediation: $2,093 per household.
- CDC health risk index: 10.89.
Who Supplies Your Water in Marietta
Throughout Marietta, GA, water comes from one of 3 primary utilities out of 8 total systems — independent providers with different rate structures, infrastructure, and compliance records that vary across the service territory.
Overview
We track water quality and home safety data for 14 ZIP codes in Marietta, Georgia (population ~329,774), covering 8 community water systems serving approximately 1,454,760 people region-wide.
No EPA violations recorded across any ZIP codes in Marietta — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Marietta: C (63/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Marietta water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0011 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
- Zone 1 (High): 14 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 30006 | C | Cobb County | 695,000 |
| 30007 | C | Cobb County | 695,000 |
| 30008 | C | Cobb County | 695,000 |
| 30060 | C | Cobb County | 695,000 |
| 30061 | C | Cobb County | 695,000 |
| 30062 | C | Cobb County | 695,000 |
| 30063 | C | Cobb County | 695,000 |
| 30064 | C | Cobb County | 695,000 |
| 30065 | C | Cobb County | 695,000 |
| 30066 | C | Cobb County | 695,000 |
All ZIP Codes in Marietta
- 30006 [C]
- 30007 [C]
- 30008 [C]
- 30060 [C]
- 30061 [C]
- 30062 [C]
- 30063 [C]
- 30064 [C]
- 30065 [C]
- 30066 [C]
- 30067 [C]
- 30068 [C]
- 30069 [C]
- 30090 [C]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Health Outcomes in Marietta
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Cost Context: What Remediation Means for Marietta Homeowners
The household financial picture for Marietta homeowners is proportionally favorable — addressing documented issues claims a small slice of equity, and the cost-to-value ratio puts this area well within the manageable tier.
Remediation costs in Marietta are relatively low compared to home values. The $1,379–$2,850 estimated range is a small fraction of median property value. Home values are 91% above the Georgia average.
Lead Exposure Risk for Children in Marietta
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Lead risk in Marietta appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Marietta
The National Flood Insurance Program builds its dataset one claim at a time — each filed claim represents a property where flood damage was severe enough to trigger an insurance payout. For Marietta, that dataset has accumulated 972 such events across the program's multi-decade history. 50% of ZIP codes here carry official FEMA flood zone designations, reflecting federal assessments of where flood risk is concentrated. Together, those data points describe a community with a documented, substantial flood exposure — the kind that shapes not just property risk but also the periodic reliability of water supply infrastructure. When flood events reach that scale, treatment systems face peak-load contamination stress, private wells become vulnerable to surface water intrusion, and the distribution network can experience backflow conditions that allow untreated water to re-enter the system.
Marietta has a significant flood history with 972 FEMA flood insurance claims on record, averaging $14,200 per claim. With 50% of ZIP codes in FEMA-designated flood zones, flood risk is a major concern for homeowners and water quality.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,093</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Marietta
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Marietta, GA