How much wastewater does Jefferson Parish Department Of Sewerage- Marrero WWTP treat?

Jefferson Parish Department Of Sewerage- Marrero WWTP treats an average of 6.19 MGD and is permitted for a design flow of 9.6 MGD.

What treatment technology does Jefferson Parish Department Of Sewerage- Marrero WWTP use?

Klarifi has identified clarifiers, biogas balloons at the Marrero facility.

What is the NPDES permit for Jefferson Parish Department Of Sewerage- Marrero WWTP?

The facility discharges under NPDES permit LA0042048, currently effective, expiring October 2026.

Is Jefferson Parish Department Of Sewerage- Marrero WWTP in compliance?

Discharge monitoring reports show 5 violations at Jefferson Parish Department Of Sewerage- Marrero WWTP in the last three years, 5 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Jefferson Parish Department Of Sewerage- Marrero WWTP and how do I contact them?

Jefferson Parish Department Of Sewerage- Marrero WWTP is a publicly owned treatment works in Marrero, Louisiana. Klarifi lists 20 verified decision-maker contacts for this facility, available with a free trial.

Try for free Log in

Jefferson Parish Department Of Sewerage- Marrero WWTP

Marrero, LA · Jefferson County · Publicly Owned Treatment Works

Average flow: 6.19 MGD

Design flow: 9.6 MGD

NPDES permit: LA0042048; Effective

Permit expires: October 2026

Population served: 78,085; CWNS 2022

Jefferson Parish Department Of Sewerage- Marrero WWTP is a publicly owned wastewater treatment works in Marrero, Jefferson County, Louisiana treating an average of 6.19 million gallons per day against a permitted design capacity of 9.6 MGD, serving about 78,085 residents. Treatment on site includes clarifiers, biogas balloons. It discharges under NPDES permit LA0042048 (effective), which expires in October 2026, with 5 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Clarifiers

Unlock

Biogas balloons

Unlock

Unlock exact unit counts →

Compliance snapshot (last 3 years)

Total violations: 5

Effluent violations: 5

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

20 verified contacts for Jefferson Parish Department Of Sewerage- Marrero WWTP, with validated emails and direct phone numbers.

Unlock 20 verified contacts (17 more than shown)

Names, validated emails and direct phone numbers for decision-makers at Jefferson Parish Department Of Sewerage- Marrero WWTP, plus the full compliance history and discharge data.

Try Klarifi free

Nearby wastewater treatment plants in Louisiana

Jefferson Parish Dept Of Sewerage - Harv

Harvey · 3 mi away

—

Bridge City Wastewater Treatment Plant

Bridge City · 5 mi away

1.59 MGD

Gretna City Of Wastewater Treatment Plant

Gretna · 6 mi away

1.17 MGD

Carrollton Water Purification Plant

New Orleans · 6 mi away

3.38 MGD

Harahan, City Of

Harahan · 7 mi away

1.17 MGD

Jefferson Parish Department Of Sewerage- East Bank WWTP

Elmwood · 8 mi away

20.66 MGD

Plaquemines Parish Government- Belle Chasse WWTP

Belle Chasse · 8 mi away

1.34 MGD

Rosethorn WWTP

Lafitte · 8 mi away

0.07 MGD

Jefferson Parish Department Of Sewerage- Marrero WWTP: frequently asked questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed September 11, 2026; facility record last updated April 1, 2025.

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free