Is Mount Holly, NJ Tap Water Safe to Drink?
Mount Holly tap water is legally compliant, but one contaminant exceeds health guidelines. Specifically: PFAS above EPA limits (PFOA: 4.8 ppt, PFOS: 4.2 ppt — limit is 4 ppt each). A point-of-use filter is recommended for drinking and cooking water.
Hardness Scale: Where Mount Holly Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Mount Holly Compares
Mount Holly's water is 67% softer than the national average of 138 PPM - ranking in the bottom 74% for hardness nationwide. Most homes here do not need a softener. Within New Jersey, it ranks #13 of 22 cities (0% below the state average of 45 PPM). Among smaller cities, Mount Holly ranks #181 of 288 for hardness.
What Mount Holly's Water Means for Your Home
Hardness: 45 PPM - Low Concern
Mount Holly's water is slightly hard at 45 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. Mount Holly has PFOA at 4.8 ppt and PFOS at 4.2 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
Mount Holly's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 9.97 ppb (12% of the legal limit, but 66x the EWG guideline) and HAA5 at 3.46 ppb (6% of the legal limit, but 35x 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 0.491 ppb, which is 25x 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) | 45 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 80 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 18.05 ppt | — | No total limit | Detected |
| ↳ PFOA | 4.8 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| ↳ PFOS | 4.2 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| Lead | 3 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.2 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.3 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommended Filter for Mount Holly
PFAS exceed EPA limits (PFOA: 4.8 ppt, PFOS: 4.2 ppt — limit: 4 ppt each). A certified filter reduces these contaminants effectively.
Quick Fix for Chlorine: Shower Filter
At 1.2 mg/L chlorine, many Mount Holly 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 Mount Holly
With PFAS at 18.05 ppt in Mount Holly'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 NJ American Water's annual Consumer Confidence Report for official city-level data.
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About Mount Holly's Water Supply
Water Utility: NJ American Water
Water Source: Rancocas Creek + wells (Surface Water)
Population Served: 47,427
Hardness: 45 PPM (2.6 grains per gallon)
Mount Holly's drinking water comes from surface sources — Rancocas Creek + wells. 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 47,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request NJ 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 NJ American Water in Mount Holly, NJ, including ZIP codes:
08004, 08009, 08011, 08015, 08016, 08019, 08022, 08036, 08041, 08042, 08046, 08048, 08053, 08054, 08055, 08060, 08064, 08068, 08073, 08088, 08091, 08511, 08533, 08562
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Mount Holly to Other New Jersey Cities
Frequently Asked Questions About Mount Holly Water
Is Mount Holly tap water safe to drink?
Where does Mount Holly's water come from?
Do I need a water softener in Mount Holly?
How do I remove PFAS from Mount Holly tap water?
What water filter is best for Mount Holly?
Is Mount Holly water safe for babies and infants?
What are disinfection byproducts in Mount Holly's water?
Is chromium-6 in Mount Holly'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 Mount Holly Homeowners Actually Buy
Prioritized for contaminant reduction for homes with 45 PPM water and PFAS above EPA limits.
Affiliate disclosure: we may earn a commission. Selection based on Mount Holly's water data.