States › Louisiana › Assumption Parish

Assumption Parish, LA Water Quality

Water quality data for 3 public water systems serving Assumption Parish, Louisiana — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 3 water systems · 6 cities
⚠️
Caution Advised — Some Systems Need Attention

Some systems have elevated lead levels or active violations. Check your specific city below.

C

Assumption Parish Earns a C

Assumption Parish: 6 communities across 3 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 5 communities with a lead detection, 1 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 5 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
3
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
  • Belle Rose
    Not detected
    7 health-based violations since 2015
    B
  • Bayou L'Ourse
    0.82 ppb
    3 significant inspection deficiencies
    C
  • Labadieville
    2.00 ppb
    3 significant inspection deficiencies
    C
  • Paincourtville
    2.00 ppb
    3 significant inspection deficiencies
    C
  • Supreme
    2.00 ppb
    3 significant inspection deficiencies
    C
⚠ Needs Attention
  • Bayou L'Ourse
    0.82 ppb
    3 significant inspection deficiencies
    C
  • Labadieville
    2.00 ppb
    3 significant inspection deficiencies
    C
  • Paincourtville
    2.00 ppb
    3 significant inspection deficiencies
    C
  • Supreme
    2.00 ppb
    3 significant inspection deficiencies
    C
  • Napoleonville
    2.00 ppb
    3 significant inspection deficiencies
    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
5
No Data
1

All Cities in Assumption Parish

Bayou L'Ourse 0.82 ppb C
Belle Rose Not detected B
Labadieville 2.00 ppb C
Paincourtville 2.00 ppb C
Supreme 2.00 ppb C
Napoleonville 2.00 ppb C
Showing 6 cities
No active violations Active violations

About Assumption Parish Drinking Water

Assumption Parish is served by 3 water systems covering 6 communities. No community here has an open violation on record.

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

Frequently Asked Questions

Is Assumption Parish tap water safe to drink?▼
No community in Assumption Parish has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Assumption Parish?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Assumption Parish?▼
3 community water systems serve 6 communities here.
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