Is Kennesaw, GA Tap Water Safe to Drink?
Yes, Kennesaw tap water is safe to drink. Hardness is low at 25 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Kennesaw Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Kennesaw Compares
Kennesaw's water is 82% softer than the national average of 138 PPM - ranking in the bottom 88% for hardness nationwide. Most homes here do not need a softener. Within Georgia, it ranks #21 of 25 cities (24% below the state average of 33 PPM). Among major US cities (500k+), Kennesaw ranks #93 of 100 for hardness.
What Kennesaw's Water Means for Your Home
Hardness: 25 PPM - Low Concern
Kennesaw's water is slightly hard at 25 PPM. Most households won't notice any issues at this level. Scale buildup is minimal, and a water softener would be overkill. Kennesaw is softer than 88% 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. Kennesaw's water has TTHMs at 41.7 ppb and HAA5 at 25.3 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
Kennesaw's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 41.7 ppb (52% of the legal limit, but 278x the EWG guideline) and HAA5 at 25.3 ppb (42% of the legal limit, but 253x 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 0.085 ppb, which is 4.3x 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) | 25 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 48 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 13.28 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 | 1.7 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.478 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Kennesaw Homes
Quick Fix for Chlorine: Shower Filter
At 1.7 mg/L chlorine, many Kennesaw 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 Kennesaw
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's annual Consumer Confidence Report for official city-level data.
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About Kennesaw's Water Supply
Water Utility: Cobb County-Marietta Water
Water Source: Chattahoochee River (Surface Water)
Population Served: 695,000
Hardness: 25 PPM (1.5 grains per gallon)
Kennesaw's drinking water comes from surface sources — Chattahoochee River. 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 695,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Cobb County-Marietta Water'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 in Kennesaw, GA, including ZIP codes:
30101, 30102, 30103, 30104, 30110, 30113, 30120, 30121, 30123, 30124, 30125, 30129, 30132, 30137, 30138, 30139, 30140, 30144, 30145, 30147, 30149, 30152, 30153, 30156, 30157, 30160, 30161, 30162, 30163, 30164, 30165, 30171, 30172, 30173, 30176, 30178, 30179, 30182, 30183, 30184, 30188, 30189, 30701, 30703, 30732, 30733, 30734, 31144, 35960, 36261, 36262, 36269, 36272, 36275
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Kennesaw to Other Georgia Cities
Frequently Asked Questions About Kennesaw Water
Is Kennesaw tap water safe to drink?
Where does Kennesaw's water come from?
Do I need a water softener in Kennesaw?
What are disinfection byproducts in Kennesaw's water?
Is chromium-6 in Kennesaw's water?
Why does Kennesaw water taste like chlorine?
Can I drink Kennesaw tap water straight from the faucet?
What water filter is best for Kennesaw?
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 Kennesaw Homeowners Actually Buy
Common purchases for homes with 25 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Kennesaw's water data.