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Jefferson Parish, LA Water Quality

Water quality data for 4 public water systems serving Jefferson Parish, Louisiana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 4 water systems · 21 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Jefferson Parish Earns a B

Jefferson Parish: 21 communities across 4 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.37 ppb
  • 20 communities with a lead detection, 1 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 20 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.37 ppb
Median Lead Level
County-wide, 90th percentile
4
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Westwego
    1.00 ppb
    2 health-based violations since 2015
    A
  • Marrero
    2.37 ppb
    2 significant inspection deficiencies
    B
  • Harvey
    2.37 ppb
    2 significant inspection deficiencies
    B
  • Estelle
    2.37 ppb
    2 significant inspection deficiencies
    B
  • Terrytown
    2.37 ppb
    2 significant inspection deficiencies
    B
⚠ Needs Attention
  • Gretna
    Not detected
    3 significant inspection deficiencies
    C
  • Metairie
    2.65 ppb
    4 significant inspection deficiencies
    B
  • Kenner
    2.65 ppb
    4 significant inspection deficiencies
    B
  • River Ridge
    2.65 ppb
    4 significant inspection deficiencies
    B
  • Jefferson
    2.65 ppb
    4 significant inspection deficiencies
    B
County Lead Level — Median 2.37 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.37 ppb — 15.8% of the federal action level
Systems by Lead Level
Under 5 ppb
20
No Data
1

All Cities in Jefferson Parish

Metairie 2.65 ppb B
Kenner 2.65 ppb B
Marrero 2.37 ppb B
Harvey 2.37 ppb B
Estelle 2.37 ppb B
Gretna Not detected C
Terrytown 2.37 ppb B
River Ridge 2.65 ppb B
Woodmere 2.37 ppb B
Jefferson 2.65 ppb B
Waggaman 2.37 ppb B
Harahan 2.65 ppb B
Westwego 1.00 ppb A
Timberlane 2.37 ppb B
Elmwood 2.65 ppb B
Bridge City 2.37 ppb B
Avondale 2.37 ppb B
Jean Lafitte 2.37 ppb B
Barataria 2.37 ppb B
Lafitte 2.37 ppb B
Grand Isle 2.37 ppb B
Showing 21 cities
No active violations Active violations

About Jefferson Parish Drinking Water

Jefferson Parish is served by 4 water systems covering 21 communities. No community here has an open violation on record.

Of the communities reporting lead results, 20 recorded a detection, with a median of 2.37 ppb — 16% of the federal action level. 1 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 20 of them.

Frequently Asked Questions

Is Jefferson Parish tap water safe to drink?▼
No community in Jefferson Parish has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Jefferson Parish?▼
Among communities with a detection the median is 2.37 ppb, 16% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Jefferson Parish?▼
4 community water systems serve 21 communities here.
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