Marrero Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
river
pH Level
7.6
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
160.2 mg/L
Est. Daily Cost
$0.40
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Marrero, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Marrero | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Marrero compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Marrero, Louisiana | ≈ 120–179 mg/L | 8.5 ppt | 🟠 Hard | river |
| Harvey, Louisiana | ≈ 0–60 mg/L | 7 ppt | 🟢 Soft | river |
| Woodmere, Louisiana | ≈ 120–179 mg/L | 12.3 ppt | 🟠 Hard | river |
| Gretna, Louisiana | ≈ 120–179 mg/L | 5.1 ppt | 🟠 Hard | river |
| Estelle, Louisiana | ≈ 120–179 mg/L | 13.9 ppt | 🟠 Hard | river |
National Benchmark
How Marrero compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Marrero | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Marrero's Water Unique?
Local geology and source profile
Marrero, Louisiana, receives drinking water from the Jefferson Parish Department of Water, serving Jefferson Parish including the Marrero CDP in the New Orleans metro area. The utility sources water from multiple aquifers — the shallow Mississippi River Alluvial Aquifer and the deeper Chicot–Evangeline Aquifer system — via well fields across the parish. Treatment at parish facilities includes filtration, disinfection, and corrosion control, with no specific plant names available. The system earned an 82% Water Grade from the Louisiana Department of Health in 2023, indicating good overall compliance.
The supply is influenced by the Pontchartrain Basin watershed, encompassing Lake Pontchartrain and Mississippi River influences north of Marrero. Water infiltrates through Quaternary alluvial deposits and Tertiary sands of the Gulf Coast Aquifer, shaped by deltaic sedimentation during the Pleistocene and Holocene epochs. Calcareous shell beds and limestone fragments in these formations impart a moderately mineralized profile, with the geology favoring elevated calcium and magnesium over very soft rainwater-dominated chemistries.
At moderately hard levels, Marrero water causes moderate scale buildup in water heaters, dishwashers, and washing machines, reducing efficiency by 20–30% over time. Soap lathering is somewhat reduced, leading to higher detergent use. Periodic vinegar descaling of fixtures and coffee makers is recommended; a water softener is advisable for households with hard water concerns to extend appliance life. The 2024 Consumer Confidence Report confirms lead and copper compliance via corrosion control; pH is typically 7.5–8.5. All EPA MCLGs are met per 2026 TapWaterData analysis, with no PFAS exceedances. Treatment includes coagulation-filtration and chloramination with fluoride addition.
Geology & Source: Mississippi River Alluvial Aquifer and Chicot–Evangeline Aquifers (Gulf Coast Aquifer System) — Pleistocene–Holocene sands, gravels, clays; calcareous sediments contribute calcium and magnesium; moderately mineralized coastal plain character
Other Louisiana Water Reports
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Frequently Asked Questions
Is Marrero's water safe to drink?
Do I need a water softener in Marrero?
How does Marrero compare to the USA average?
Data Sources & Methodology
Water quality data for Marrero is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.