Is Allentown, PA Tap Water Safe to Drink?
Allentown tap water is legally compliant, but one contaminant exceeds health guidelines. Specifically: PFAS above EPA limits (PFOS: 4.4 ppt — limit is 4 ppt each). A point-of-use filter is recommended for drinking and cooking water.
Hardness Scale: Where Allentown Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Allentown Compares
Allentown's water is 59% softer than the national average of 138 PPM - ranking in the bottom 68% for hardness nationwide. Most homes here do not need a softener. Within Pennsylvania, it ranks #24 of 31 cities (41% below the state average of 97 PPM). Among mid-size cities (100k-200k), Allentown ranks #140 of 189 for hardness.
What Allentown's Water Means for Your Home
Hardness: 57 PPM - Low Concern
Allentown's water is slightly hard at 57 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
Forever chemicals (PFAS) are worth watching here. Allentown has PFOS at 4.4 ppt, exceeding the EPA's 2024 limit of 4 ppt per compound. PFAS are synthetic compounds that accumulate in your body over time. A certified carbon filter or reverse osmosis system with NSF P473 certification is the most effective protection. See the regulatory timeline.
What's in the Treatment Process
Allentown's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 23.6 ppb (30% of the legal limit, but 158x the EWG guideline) and HAA5 at 16.3 ppb (27% of the legal limit, but 163x 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 0.637 ppb, which is 32x 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) | 57 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 70 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 15.62 ppt | — | No total limit | Detected |
| ↳ PFOA | 0 ppt | 0 ppt | 4 ppt (2024) | ✓ OK |
| ↳ PFOS | 4.4 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| Lead | 8.8 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ⚠ Elevated |
| Chlorine / Chloramine | 0.9 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 3.84 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Allentown Homes
Recommended Filter for Allentown
PFAS exceed EPA limits (PFOS: 4.4 ppt — limit: 4 ppt each). A certified filter reduces these contaminants effectively.
How to Test Your Water in Allentown
With PFAS at 15.62 ppt in Allentown's supply, confirming your home's specific levels is especially important. PFAS vary by neighborhood and can concentrate differently depending on your position in the distribution system.
Free option: Request Lehigh County Authority's annual Consumer Confidence Report for official city-level data.
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About Allentown's Water Supply
Water Utility: Lehigh County Authority
Water Source: Little Lehigh Creek, Lehigh River (Surface Water)
Population Served: 118,000
Hardness: 57 PPM (3.3 grains per gallon)
Allentown's drinking water comes from surface sources — Little Lehigh Creek, Lehigh 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 118,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Lehigh County 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 Lehigh County Authority in Allentown, PA, including ZIP codes:
18011, 18012, 18030, 18031, 18032, 18035, 18037, 18046, 18049, 18051, 18052, 18053, 18056, 18059, 18060, 18062, 18065, 18066, 18067, 18068, 18069, 18070, 18071, 18078, 18079, 18080, 18086, 18087, 18088, 18092, 18098, 18099, 18101, 18102, 18103, 18104, 18105, 18106, 18109, 18195, 18211, 18212, 18218, 18229, 18232, 18235, 18244, 18250, 18252, 18968, 19529, 19536, 19538, 19539, 19562
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Allentown to Other Pennsylvania Cities
Frequently Asked Questions About Allentown Water
Is Allentown tap water safe to drink?
Where does Allentown's water come from?
Do I need a water softener in Allentown?
How do I remove PFAS from Allentown tap water?
What water filter is best for Allentown?
Is Allentown water safe for babies and infants?
What are disinfection byproducts in Allentown's water?
Is chromium-6 in Allentown's water?
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 Allentown Homeowners Actually Buy
Prioritized for contaminant reduction for homes with 57 PPM water and PFAS above EPA limits.
Affiliate disclosure: we may earn a commission. Selection based on Allentown's water data.