Community Water System · PWS LA1103176
Madisonville on the Lake
Operator location Mandeville, Louisiana - 75% of 44 violations are health-based (upper-third health share (> 23%)); groundwater source; 51 served per SDWIS.
- 51
- People served (this PWS)
- 44
- EPA violations (this PWS)
- 33
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Madisonville on the Lake standing, mid SDWIS violation third
75% of 44 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 75% is upper-third health share (> 23%).
The verdict
Madisonville on the Lake lands in the middle third by violation volume (44), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (51; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 75% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 44
- Total EPA violations on record
- 75%
- Health-based (MCL / treatment failure)
- 51
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 17
- County
- St. Tammany Parish
- School/Daycare
- No
- MCL Violations
- 10
- Monitoring Violations
- 0
- Treatment Tech Violations
- 23
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Groundwater Rule | TT | 22 | 2025 |
| Coliform (TCR) | MCL | 10 | 2015 |
| Consumer Confidence Rule | Other | 6 | 2024 |
| Public Notice | Other | 4 | 2023 |
| LEAD AND COPPER RULE REVISIONS | RPT | 1 | 2024 |
| LEAD AND COPPER RULE REVISIONS | TT | 1 | 2024 |
Violation Count vs. the National Corpus
Madisonville on the Lake has 44 recorded EPA violations, 53% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 46% carry more. 75% of this system's own violations are health-based (33 of 44), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
44 Around the middle fewer violations than 46% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Madisonville on the Lake
33 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for LA1103176.
Sources: EPA SDWIS
Nationwide peers
44 violations · 51 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Madisonville on the Lake
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Louisiana compares on the same EPA violation measures. Louisiana systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.