St Tammany Water District 3
EPA ID: LA1103056 · 2,920 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for St Tammany Water District 3 (LA1103056): 3 unresolved EPA violations on record. Looking at the EPA enforcement file for St Tammany Water District 3, 3 violations are listed as unresolved - those findings cover the utility's service area of approximately 2,920 people and remain open in the federal compliance system, awaiting formal corrective action documentation.
Data: EPA SDWIS
Service Area Map
Coverage area for St Tammany Water District 3 Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The St Tammany Water District 3 serves a community with a median household income of $96,510 and an estimated 23,745 residents across its service area.
💧 Where Does Your Water Come From?
St Tammany Water District 3's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How St Tammany Water District 3 compares to EPA limits
What This Means For You
Surface Water Treatment Rule at 3 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Comparable Water Systems
Similar-sized systems in Louisiana
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
St Tammany Water District 3 (EPA ID: LA1103056) is a community water system in Louisiana that serves approximately 2,920 people from groundwater sources.
This system serves ZIP code 70471 in Mandeville.
Violation History
Status breakdown for accepted records with record years 2021-2026: 2 resolved, 0 archived, 0 addressed, and 3 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| February 4, 2026 | Stage 1 DBP Rule | Non-health-based | Unaddressed (current) |
| July 1, 2025 | Surface Water Treatment Rule | Non-health-based | Unaddressed (current) |
| July 1, 2024 | Surface Water Treatment Rule | Non-health-based | Unaddressed (current) |
| July 1, 2023 | Surface Water Treatment Rule | Non-health-based | Resolved |
| November 30, 2022 | Stage 1 DBP Rule | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Failure | 3 | No |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.007 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by LA or modeled from parcel and building-footprint data.
- 70471 - Mandeville
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for St Tammany Water District 3 (LA1103056) on EPA.gov.
Frequently Asked Questions
Is St Tammany Water District 3 water safe to drink?
The accepted 2026Q2 ECHO snapshot shows 3 current noncompliance records and zero current records classified as health-based. That classification is not a property-specific water test or safety guarantee.
How many people does St Tammany Water District 3 serve?
St Tammany Water District 3 serves approximately 2,920 people across 1 ZIP code in Louisiana.
Where does St Tammany Water District 3 get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). St Tammany Water District 3 (LA): 5 EPA Violations. https://zipcheckup.com/water-system/la1103056/
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author = {{ZipCheckup}},
title = {{St Tammany Water District 3 (LA): 5 EPA Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/la1103056/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
St Tammany Water District 3 (EPA ID: LA1103056) - request the latest Consumer Confidence Report or ask about specific contaminants.