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St. Landry Parish, LA Water Quality

Water quality data for 14 public water systems serving St. Landry Parish, Louisiana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 14 water systems · 14 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

St. Landry Parish Earns a B

St. Landry Parish: 14 communities across 14 water systems. 85.7% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 8 communities with a lead detection, 6 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 5 with significant inspection deficiencies
  • 85.7% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
14
Water Systems
Active CWS & NTNCWS
85%
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
  • Eunice
    2.00 ppb
    No federal limits exceeded on record
    A
  • Krotz Springs
    Not detected
    No federal limits exceeded on record
    B
  • Arnaudville
    Not detected
    Copper above the 1,300 ppb action level
    A
  • Morrow
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Opelousas
    2.00 ppb
    7 health-based violations since 2015
    B
⚠ Needs Attention
  • Grand Coteau
    7.00 ppb
    Copper above the 1,300 ppb action level
    F
  • Melville
    2.00 ppb
    5 violations currently open
    D
  • Lawtell
    Not detected
    Copper above the 1,300 ppb action level
    C
  • Sunset
    0.38 ppb
    Copper above the 1,300 ppb action level
    C
  • Port Barre
    Not detected
    1 significant inspection deficiency
    C
County Lead Level — Median 2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2 ppb — 13.3% of the federal action level
Systems by Lead Level
Under 5 ppb
7
5 – 10 ppb
1
No Data
6

All Cities in St. Landry Parish

Opelousas 2.00 ppb B
Eunice 2.00 ppb A
Sunset 0.38 ppb C
Lawtell Not detected C
Krotz Springs Not detected B
Port Barre Not detected C
Leonville 2.50 ppb C
Melville 2.00 ppb D
Washington 1.00 ppb B
Arnaudville Not detected A
Grand Coteau 7.00 ppb F
Cankton Not detected C
Morrow Not detected B
Palmetto 3.00 ppb B
Showing 14 cities
No active violations Active violations

About St. Landry Parish Drinking Water

St. Landry Parish is served by 14 water systems covering 14 communities. 86% have no open violations.

Of the communities reporting lead results, 8 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 6 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 5 of them.

Frequently Asked Questions

Is St. Landry Parish tap water safe to drink?▼
86% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in St. Landry Parish?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 6 reported none detected and 0 reported no result.
How many water systems serve St. Landry Parish?▼
14 community water systems serve 14 communities here.
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