Is Cary, NC Tap Water Safe to Drink?
Yes, Cary tap water is safe to drink. Hardness is low at 49 PPM, and no contaminants exceed health guidelines. Most homes here don't need treatment.
Hardness Scale: Where Cary Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Cary Compares
Cary's water is 64% softer than the national average of 138 PPM - ranking in the bottom 71% for hardness nationwide. Most homes here do not need a softener. Within North Carolina, it ranks #6 of 25 cities (20% above the state average of 41 PPM). Among large cities (200k-500k), Cary ranks #118 of 165 for hardness.
What Cary's Water Means for Your Home
Hardness: 49 PPM - Low Concern
Cary's water is slightly hard at 49 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
Disinfection byproducts are the notable finding here. Cary's water has TTHMs at 38.2 ppb and HAA5 at 13.5 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
Cary's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 38.2 ppb (48% of the legal limit, but 255x the EWG guideline) and HAA5 at 13.5 ppb (23% of the legal limit, but 135x 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. 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) | 49 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 67 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 20.86 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| Lead | 3.2 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.3 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 Cary 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 1.3 mg/L chlorine, many Cary 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 Cary
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 Town of Cary's annual Consumer Confidence Report for official city-level data.
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About Cary's Water Supply
Water Utility: Town of Cary
Water Source: Jordan Lake (Surface Water)
Population Served: 224,000
Hardness: 49 PPM (2.9 grains per gallon)
Cary's drinking water comes from surface sources — Jordan 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 224,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Town of Cary'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 Town of Cary in Cary, NC, including ZIP codes:
27511, 27512, 27513, 27518, 27519, 27560
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Cary to Other North Carolina Cities
Frequently Asked Questions About Cary Water
Is Cary tap water safe to drink?
Where does Cary's water come from?
Do I need a water softener in Cary?
What are disinfection byproducts in Cary's water?
Why does Cary water taste like chlorine?
Can I drink Cary tap water straight from the faucet?
What water filter is best for Cary?
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 Cary Homeowners Actually Buy
Common purchases for homes with 49 PPM water.
Affiliate disclosure: we may earn a commission. Selection based on Cary's water data.