Is Marrero, LA Tap Water Safe to Drink?
Marrero tap water is legally compliant, but one contaminant exceeds health guidelines. Specifically: PFAS above EPA limits (PFOA: 4.1 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 Marrero Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Marrero Compares
Marrero's water is 38% 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 Louisiana, it ranks #5 of 15 cities (5% above the state average of 81 PPM). Among large cities (200k-500k), Marrero ranks #97 of 165 for hardness.
What Marrero's Water Means for Your Home
Hardness: 85 PPM - Low Concern
Marrero's water is moderately hard at 85 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
Forever chemicals (PFAS) are worth watching here. Marrero has PFOA at 4.1 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
Marrero's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 21.4 ppb (27% of the legal limit, but 143x the EWG guideline) and HAA5 at 20.8 ppb (35% of the legal limit, but 208x 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) | 85 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 145 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 32.44 ppt | — | No total limit | Detected |
| ↳ PFOA | 4.1 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| ↳ PFOS | 4.2 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| Lead | 5 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 1.7 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 1.16 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommendations for Marrero Homes
Recommended Filter for Marrero
PFAS exceed EPA limits (PFOA: 4.1 ppt, PFOS: 4.2 ppt — limit: 4 ppt each). A certified filter reduces these contaminants effectively.
Quick Fix for Chlorine: Shower Filter
At 1.7 mg/L chlorine, many Marrero 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 Marrero
With PFAS at 32.44 ppt in Marrero'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 Jefferson Parish Water's annual Consumer Confidence Report for official city-level data.
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About Marrero's Water Supply
Water Utility: Jefferson Parish Water
Water Source: Mississippi River (Surface Water)
Population Served: 334,903
Hardness: 85 PPM (5 grains per gallon)
Marrero's drinking water comes from surface sources — Mississippi 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 335,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Jefferson Parish 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 Jefferson Parish Water in Marrero, LA, including ZIP codes:
70036, 70037, 70038, 70040, 70041, 70050, 70058, 70067, 70072, 70073, 70081, 70082, 70083, 70091, 70093, 70094, 70358
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Marrero to Other Louisiana Cities
Frequently Asked Questions About Marrero Water
Is Marrero tap water safe to drink?
Where does Marrero's water come from?
Do I need a water softener in Marrero?
How do I remove PFAS from Marrero tap water?
What water filter is best for Marrero?
Is Marrero water safe for babies and infants?
What is the hardness of Marrero water in grains per gallon?
What are disinfection byproducts in Marrero'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 Marrero Homeowners Actually Buy
Prioritized for contaminant reduction for homes with 85 PPM water and PFAS above EPA limits.
Affiliate disclosure: we may earn a commission. Selection based on Marrero's water data.