Is Marietta, GA Tap Water Safe to Drink?
Yes, Marietta tap water is safe to drink. Hardness is low at 33 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Marietta Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Marietta Compares
Marietta's water is 76% softer than the national average of 138 PPM - ranking in the bottom 81% for hardness nationwide. Most homes here do not need a softener. Within Georgia, it ranks #14 of 25 cities (0% below the state average of 33 PPM). Among cities (50k-100k), Marietta ranks #225 of 258 for hardness.
What Marietta's Water Means for Your Home
Hardness: 33 PPM - Low Concern
Marietta's water is slightly hard at 33 PPM. Most households won't notice any issues at this level. Scale buildup is minimal, and a water softener would be overkill. Marietta is softer than 81% of US cities. If you're thinking about water treatment, contaminant filtration is where to focus your money, not softening.
Contaminants & Safety
Disinfection byproducts are the notable finding here. Marietta's water has TTHMs at 51.9 ppb and HAA5 at 23.3 ppb — both within legal limits, but the EWG health guidelines are far stricter. These byproducts form when chlorine reacts with organic matter during treatment. A whole-house activated carbon filter reduces both chlorine and its byproducts. Want the full picture? Request your utility's annual Consumer Confidence Report.
What's in the Treatment Process
Marietta's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 51.9 ppb (65% of the legal limit, but 346x the EWG guideline) and HAA5 at 23.3 ppb (39% of the legal limit, but 233x the EWG guideline). These are within legal limits, but the EWG sets much tighter thresholds based on cancer-risk research. A whole-house activated carbon filter reduces both chlorine and byproducts.
Chromium-6 was detected at 0.0686 ppb, which is 3.4x the EWG health guideline. There's no separate federal limit for chromium-6, only total chromium. A reverse osmosis system is the most effective removal method. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 33 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 43 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 8 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 2.6 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | Not reported | 5 mg/L | 10 mg/L | N/A |
Good news for Marietta residents. Your water quality is generally good. Most homes in this area do not need a water softener. If you have concerns about lead (especially in buildings constructed before 1986) or chlorine taste, a point-of-use filter is the most practical and cost-effective solution.
Quick Fix for Chlorine: Shower Filter
At 1 mg/L chlorine, many Marietta residents notice dry skin, brittle hair, and that "pool smell" in the shower. A shower filter installs in 5 minutes, no tools needed.
How to Test Your Water in Marietta
City-wide data is a solid starting point, but your specific tap might differ based on plumbing age, distance from the treatment plant, or seasonal changes.
Free option: Request Cobb County-Marietta Water Authority's annual Consumer Confidence Report for official city-level data.
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About Marietta's Water Supply
Water Utility: Cobb County-Marietta Water Authority
Water Source: Allatoona Lake (Surface Water)
Population Served: 60,100
Hardness: 33 PPM (1.9 grains per gallon)
Marietta's drinking water comes from surface sources — Allatoona Lake. Surface water requires more extensive treatment than groundwater, including coagulation, filtration, and disinfection. This heavier chlorination is why disinfection byproducts tend to be higher in surface-supplied systems. On the upside, surface sources often deliver softer water than deep aquifers. The system serves 60,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Cobb County-Marietta Water Authority's Consumer Confidence Report (CCR) or test your own tap.
ZIP Codes Covered by This Report
This water quality data applies to all areas served by Cobb County-Marietta Water Authority in Marietta, GA, including ZIP codes:
30006, 30007, 30008, 30060, 30061, 30062, 30063, 30064, 30065, 30066, 30067, 30068, 30069, 30090, 30111, 30127, 30141
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Marietta to Other Georgia Cities
Frequently Asked Questions About Marietta Water
Is Marietta tap water safe to drink?
Where does Marietta's water come from?
Do I need a water softener in Marietta?
What are disinfection byproducts in Marietta's water?
Is chromium-6 in Marietta's water?
Why does Marietta water taste like chlorine?
Can I drink Marietta tap water straight from the faucet?
What water filter is best for Marietta?
Data sources: Lead and copper data from EPA Safe Drinking Water Act LCR reporting. Contaminant data from utility-reported testing results. PFAS data from EPA UCMR5 (2023–2025). Hardness from USGS and municipal reports. Data reflects system-level testing results and may not match your specific tap due to neighborhood plumbing, season, or recent utility changes. For your utility's latest results, request their Consumer Confidence Report (CCR). Our methodology. Last updated: 2026-02-24.
What Marietta Homeowners Actually Buy
Common purchases for homes with 33 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Marietta's water data.