Jefferson Parish Water Quality: 48 Violations (LA)
7 water systems · 17 ZIP codes · Home Safety Score 98/100 (A) · 17 of 35 tracked ZIP records scored · Updated
Data: EPA Safe Drinking Water Information System (SDWIS), EPA ECHO Last verified:
Violation Trend
EPA violations across water systems in Jefferson Parish.
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Find the Right Filter →Water Quality Overview
Jefferson Parish has 7 community water systems across 17 directly mapped ZIP records. The systems report serving approximately 848,319 people. The available records contain 48 EPA violations, including 29 health-based violations.
Health-based violations account for 60% of all violations in Jefferson Parish. These violations indicate contaminant levels that may pose direct risks to human health.
Violation Breakdown
| Violation Type | Count | Percentage |
|---|---|---|
| Health-based | 29 | 60.4% |
| Monitoring/Reporting | 19 | 39.6% |
| Total | 48 | 100% |
Health-based violations indicate contaminant levels exceeding EPA Maximum Contaminant Levels (MCLs). Monitoring violations indicate failures to test or report.
Cities with Most Violations
| Rank | City | Violations | Health-Based | ZIP Codes | Population |
|---|---|---|---|---|---|
| 1 | Gretna | 15 | 9 | 2 | 58,880 |
| 2 | Marrero | 14 | 8 | 1 | 55,641 |
| 3 | Harvey | 9 | 7 | 1 | 39,690 |
| 4 | Westwego | 7 | 2 | 1 | 32,031 |
| 5 | Lafitte | 1 | 1 | 1 | 2,687 |
| 6 | Barataria | 1 | 1 | 1 | 688 |
| 7 | Grand Isle | 1 | 1 | 1 | 644 |
Violation Trend
Year-by-year EPA violations across water systems in Jefferson Parish:
| Year | Total | Health-Based |
|---|---|---|
| 2021 | 12 | 12 |
| 2022 | 17 | 17 |
| 2024 | 2 | 2 |
| 2025 | 18 | 18 |
Most Common Contaminants
| Contaminant | Category | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|
| Chlorite | Disinfection Byproducts | 19 | 4 | Yes |
| Surface Water Treatment Rule | Treatment Technique | 9 | 5 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 8 | 8 | Yes |
| Fecal Coliform | Microbiological | 4 | 4 | Yes |
| Stage 2 DBP Rule | Treatment Technique | 4 | 2 | Yes |
| Stage 1 DBP Rule | Treatment Technique | 2 | 2 | No |
Water Data and the Home Safety Score
This page reports EPA water-system facts without converting the broader Home Safety Score into a drinking-water grade. The county Home Safety grade (A) is a separate multi-source index that also requires PFAS screening, radon, and annual air-quality evidence. Check each ZIP report for the versioned score and its component coverage.
Water Systems in Jefferson Parish
Jefferson Parish is served by 7 community water systems, averaging 0.2 systems per ZIP code. Each system is independently regulated and tested by the EPA. Larger systems serving more people typically have more extensive monitoring requirements.
Water systems in Jefferson Parish source water from a mix of surface water (rivers, reservoirs) and groundwater (wells, aquifers). Source type affects which contaminants are most likely to be detected.
How to Check Your Water in Jefferson Parish
Enter your ZIP code on ZipCheckup for detailed water-system data including contaminant levels and violation history; the Home Safety Score is shown separately with its model version
Request your CCR — every water utility must provide an annual Consumer Confidence Report
Get a home test — certified kits ($20-$50) or professional lab tests ($150-$400) can detect contaminants not covered by routine testing
Consider filtration — NSF-certified filters can address specific contaminants found in your area
Check for lead — homes built before 1986 should test for lead regardless of utility compliance
EPA Enforcement
The EPA and state regulators have taken 170 enforcement actions against water systems in Jefferson Parish. Enforcement actions range from compliance assistance and administrative orders to formal penalties. Systems under enforcement are required to remediate violations and may face ongoing monitoring requirements.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Enforcement: EPA ECHO
Source publication schedules vary. See the page source and verification fields for available timing evidence.
Water Quality by ZIP Code in Jefferson Parish
Water quality varies across Jefferson Parish's 17 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | City | Violations | Health | |
|---|---|---|---|---|
| 70072 | Marrero | 14 | 8 | View → |
| 70056 | Gretna | 9 | 7 | View → |
| 70058 | Harvey | 9 | 7 | View → |
| 70094 | Westwego | 7 | 2 | View → |
| 70053 | Gretna | 6 | 2 | View → |
| 70036 | Barataria | 1 | 1 | View → |
| 70067 | Lafitte | 1 | 1 | View → |
| 70358 | Grand Isle | 1 | 1 | View → |
| 70001 | Metairie | 0 | 0 | View → |
| 70002 | Metairie | 0 | 0 | View → |
| 70003 | Metairie | 0 | 0 | View → |
| 70005 | Metairie | 0 | 0 | View → |
| 70006 | Metairie | 0 | 0 | View → |
| 70062 | Kenner | 0 | 0 | View → |
| 70065 | Kenner | 0 | 0 | View → |
| 70121 | New Orleans | 0 | 0 | View → |
| 70123 | New Orleans | 0 | 0 | View → |
What are EPA health violations?
Health-based violations mean a contaminant was detected above the EPA's Maximum Contaminant Level (MCL) - the legal limit designed to protect human health. Jefferson Parish has 29 such violations. Not all violations cause illness, but repeated exceedances increase risk, especially for children and immunocompromised individuals.
Water facts and the Home Safety Score
The score shown here is the broader Home Safety Score, not a water-quality grade. Model 4.0.0 combines EPA SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, PFAS screening, radon zones, and annual air-quality evidence. Jefferson Parish has a score of 98/100 (Grade A) across 17 scored of 35 tracked ZIP records.
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Find the Right Filter →Frequently Asked Questions
Is the tap water safe in Jefferson Parish, Louisiana?
Jefferson Parish has 7 community water systems with 48 recorded EPA violations, including 29 health-based. Water quality varies by ZIP code - check your specific location for detailed results.
How many water violations does Jefferson Parish have?
Jefferson Parish has 48 total EPA violations across 17 directly mapped ZIP records. 29 are health-based.
Which city in Jefferson Parish has the most water violations?
Gretna has the most violations in Jefferson Parish with 15 recorded EPA violations across 2 ZIP codes.
What contaminants are found in Jefferson Parish water?
Jefferson Parish water systems are monitored for over 90 EPA-regulated contaminants including lead, copper, nitrates, disinfection byproducts, and bacteria. Check your ZIP code for contaminant-specific data.
How can I test my water in Jefferson Parish?
Contact your local water utility for free or low-cost testing. You can also use a certified home test kit ($20-$50) or hire a certified lab ($150-$400).