Community Water System · PWS LA1103148
Magnolia-Monterey Subdivision
Operator location Des Peres, Louisiana - 46% of 39 violations are health-based (upper-third health share (> 23%)); groundwater source; 1,356 served per SDWIS.
- 1,356
- People served (this PWS)
- 39
- EPA violations (this PWS)
- 18
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Magnolia-Monterey Subdivision standing, mid SDWIS violation third
46% of 39 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 46% is upper-third health share (> 23%). Population rank #16,820 of 29,740 among systems serving 500+.
The verdict
Magnolia-Monterey Subdivision lands in the middle third by violation volume (39), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is mid-pack at 1,356 (mid served population (≤ 3,309)). Health-based share is 46% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #16,820 of 29,740
- Population · /systems
- #450 of 707
- Population · LA
- 39
- Total EPA violations on record
- 46%
- Health-based (MCL / treatment failure)
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
- 452
- County
- St. Tammany Parish
- School/Daycare
- No
- MCL Violations
- 18
- Monitoring Violations
- 10
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 18 | 1996 |
| Consumer Confidence Rule | Other | 11 | 2013 |
| Lead and Copper Rule | MR | 7 | 2008 |
| Coliform (TCR) | MR | 2 | 2009 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule | MR | 1 | 2008 |
Violation Count vs. the National Corpus
Magnolia-Monterey Subdivision has 39 recorded EPA violations, 50% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 50% carry more. 46% of this system's own violations are health-based (18 of 39), and it ranks #16,820 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
39 Lower than most fewer violations than 50% 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 Magnolia-Monterey Subdivision
18 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for LA1103148.
Sources: EPA SDWIS
Nationwide peers
39 violations · 1,356 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.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Magnolia-Monterey Subdivision
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.