Is Decatur, AL Tap Water Safe to Drink?
Yes, Decatur tap water is safe to drink. Hardness is low at 58 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Decatur Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Decatur Compares
Decatur's water is 58% softer than the national average of 138 PPM - ranking in the bottom 67% for hardness nationwide. Most homes here do not need a softener. Within Alabama, it ranks #8 of 14 cities (17% below the state average of 70 PPM). Among cities (50k-100k), Decatur ranks #191 of 258 for hardness.
What Decatur's Water Means for Your Home
Hardness: 58 PPM - Low Concern
Decatur's water is slightly hard at 58 PPM. Most households won't notice any issues at this level. Scale buildup is minimal, and a water softener would be overkill. If you're thinking about water treatment, contaminant filtration is where to focus your money, not softening.
Contaminants & Safety
Lead levels deserve attention. At 5 ppb, Decatur is above the ideal of zero, though below the EPA action level of 15 ppb (dropping to 10 ppb in November 2027 under the Lead and Copper Rule Improvements). The lead typically comes from aging service lines or interior plumbing, not the treatment plant. A point-of-use filter certified for lead at the kitchen faucet is a practical safeguard, especially in older homes.
What's in the Treatment Process
Decatur's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 22.5 ppb (28% of the legal limit, but 150x the EWG guideline) and HAA5 at 19.2 ppb (32% of the legal limit, but 192x 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 0.08 ppb, which is 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) | 58 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 92 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 12.78 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 5 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.1 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.45 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Good news for Decatur 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 1.1 mg/L chlorine, many Decatur 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 Decatur
Lead enters water from your home's plumbing, not the treatment plant — so Decatur's city-wide average of 5 ppb may not match your tap. Testing your specific faucet is the only way to know. Run cold water for 30 seconds before collecting a sample.
Free option: Request Decatur Utilities's annual Consumer Confidence Report for official city-level data.
📊 Already Tested Your Water?
City averages miss neighborhood-level variation. Share your results to help your neighbors get better data.
We review every submission before publishing. Your ZIP is shown; your identity is not.
About Decatur's Water Supply
Water Utility: Decatur Utilities
Water Source: Tennessee River (Surface Water)
Population Served: 77,103
Hardness: 58 PPM (3.4 grains per gallon)
Decatur'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 77,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Decatur Utilities'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 Decatur Utilities in Decatur, AL, including ZIP codes:
35019, 35053, 35055, 35056, 35057, 35058, 35083, 35098, 35179, 35540, 35541, 35551, 35553, 35572, 35575, 35577, 35601, 35602, 35603, 35609, 35612, 35614, 35615, 35618, 35619, 35621, 35622, 35640, 35643, 35647, 35649, 35650, 35670, 35671, 35673, 35699
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Decatur to Other Alabama Cities
Frequently Asked Questions About Decatur Water
Is Decatur tap water safe to drink?
Where does Decatur's water come from?
Do I need a water softener in Decatur?
What are disinfection byproducts in Decatur's water?
Is chromium-6 in Decatur's water?
Why does Decatur water taste like chlorine?
Can I drink Decatur tap water straight from the faucet?
What water filter is best for Decatur?
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 Decatur Homeowners Actually Buy
Common purchases for homes with 58 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Decatur's water data.