Is Chattanooga, TN Tap Water Safe to Drink?
Yes, Chattanooga tap water is safe to drink. Hardness is low at 82 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Chattanooga Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Chattanooga Compares
Chattanooga's water is 41% softer than the national average of 138 PPM - ranking in the bottom 60% for hardness nationwide. Most homes here do not need a softener. Within Tennessee, it ranks #13 of 20 cities (15% below the state average of 96 PPM). Among large cities (200k-500k), Chattanooga ranks #98 of 165 for hardness.
What Chattanooga's Water Means for Your Home
Hardness: 82 PPM - Low Concern
Chattanooga's water is moderately hard at 82 PPM. You'll see some spotting on glassware and a film on shower doors over time, but it's not the kind of hardness that demands a full softener. A salt-free conditioner is worth considering if you have a tankless water heater or high-end fixtures.
Contaminants & Safety
Disinfection byproducts are the notable finding here. Chattanooga's water has TTHMs at 42.8 ppb and HAA5 at 21.7 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
Chattanooga's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 42.8 ppb (53% of the legal limit, but 285x the EWG guideline) and HAA5 at 21.7 ppb (36% of the legal limit, but 217x 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 0.0838 ppb, which is 4.2x 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) | 82 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 133 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 13.18 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 1 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 0.5 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.357 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Chattanooga Homes
How to Test Your Water in Chattanooga
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 Tennessee American Water's annual Consumer Confidence Report for official city-level data.
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About Chattanooga's Water Supply
Water Utility: Tennessee American Water
Water Source: Tennessee River (Surface Water)
Population Served: 211,499
Hardness: 82 PPM (4.8 grains per gallon)
Chattanooga's drinking water comes from surface sources — Tennessee 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 211,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Tennessee American 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 Tennessee American Water in Chattanooga, TN, including ZIP codes:
30105, 30541, 30555, 30705, 30707, 30708, 30710, 30711, 30719, 30720, 30721, 30722, 30724, 30726, 30728, 30730, 30735, 30736, 30739, 30740, 30741, 30742, 30746, 30747, 30751, 30753, 30755, 30756, 37302, 37304, 37307, 37308, 37309, 37310, 37311, 37312, 37315, 37316, 37320, 37321, 37322, 37323, 37332, 37336, 37338, 37341, 37343, 37351, 37353, 37361, 37362, 37363, 37364, 37367, 37373, 37379, 37384, 37401, 37402, 37403, 37404, 37405, 37406, 37407, 37408, 37409, 37410, 37411, 37412, 37414, 37415, 37416, 37419, 37421, 37422, 37424, 37450
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Chattanooga to Other Tennessee Cities
Nashville
Memphis
Knoxville
Knoxville West
Clarksville
Chattanooga Downtown
Hendersonville
Murfreesboro
Frequently Asked Questions About Chattanooga Water
Is Chattanooga tap water safe to drink?
Where does Chattanooga's water come from?
Do I need a water softener in Chattanooga?
What is the hardness of Chattanooga water in grains per gallon?
What are disinfection byproducts in Chattanooga's water?
Is chromium-6 in Chattanooga's water?
Can I drink Chattanooga tap water straight from the faucet?
What water filter is best for Chattanooga?
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.