Water Quality in Monroe, LA: 121 Violations - Grade C
Grade C · Score 63/100 · 6 water systems · Updated 2026-07-18
Monroe's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-07-18
Tracked under the EPA Safe Drinking Water program, Monroe, LA shows 121 water violations on file - findings that span multiple violation categories and are detailed system by system in the data grid further down the page.
Water Quality Map: Monroe, LA
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Water Quality by ZIP Code in Monroe
Water quality varies across Monroe's 11 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 71201 | D | 51 | 11 | 9 | View report → |
| 71202 | D | 51 | 11 | 9 | View report → |
| 71203 | D | 51 | 11 | 9 | View report → |
| 71207 | C | 66 | 11 | 9 | View report → |
| 71210 | C | 66 | 11 | 9 | View report → |
| 71211 | C | 66 | 11 | 9 | View report → |
| 71208 | C | 69 | 11 | 9 | View report → |
| 71209 | C | 69 | 11 | 9 | View report → |
| 71212 | C | 69 | 11 | 9 | View report → |
| 71213 | C | 69 | 11 | 9 | View report → |
| 71217 | C | 69 | 11 | 9 | View report → |
Violation Trend
EPA violations recorded for water systems serving Monroe.
Water Quality Overview
Monroe, Louisiana receives a water quality grade of C with an overall score of 63 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 6 water systems serving Monroe have accumulated 121 EPA violations, including 99 health-based violations. These violations are tracked across 11 ZIP codes serving approximately 88,011 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Monroe's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
The average 90th percentile lead level across Monroe water systems is 0.0020 mg/L - within EPA limits. No ZIP codes exceed the EPA lead action level.
With 66% of homes built before 1986, Monroe has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Water Systems Serving Monroe
Monroe is served by 6 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 88,011 people across 11 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 110 enforcement actions against water systems serving Monroe. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Monroe
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Monroe Water Systems
The following contaminants have been detected or caused violations across Monroe's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 77 | 11 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 22 | 11 | No |
| Stage 2 DBP Rule | Treatment Technique | N/A | 11 | 11 | Yes |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Monroe:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2022 | 27 | 27 |
| 2023 | 33 | 33 |
| 2024 | 19 | 19 |
| 2025 | 41 | 41 |
Violations have increased from 27 in 2022 to 41 in 2025. This trend warrants monitoring.
EPA Enforcement History
The EPA and state regulators have taken 12 enforcement actions against water systems serving Monroe. Recent actions:
| Date | Action Type |
|---|---|
| 2025-12-30 | State Informal Action |
| 2025-12-11 | State Informal Action |
| 2025-12-05 | State Informal Action |
| 2025-12-05 | State Informal Enforcement |
| 2025-11-03 | State Informal Action |
| 2025-10-03 | State Filed Suit |
| 2025-09-24 | State Informal Action |
| 2025-09-18 | State Informal Action |
| 2025-09-12 | State Informal Action |
| 2025-09-12 | State Informal Enforcement |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-12-30.
Monroe vs. Nearby Louisiana Cities
How Monroe's water quality compares to similar cities in Louisiana:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Monroe | C | 121 | 6 | 88,011 |
| Denham Springs | B | 3 | 9 | 84,586 |
| Houma | B | 4 | 3 | 82,468 |
| Slidell | B | 20 | 12 | 94,837 |
Water Quality by ZIP Code in Monroe
Water quality varies across Monroe's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
| ZIP Code | Score | Grade | Violations | Health-Based |
|---|---|---|---|---|
| 71201 | 51 | D | 11 | 9 |
| 71202 | 51 | D | 11 | 9 |
| 71203 | 51 | D | 11 | 9 |
| 71207 | 66 | C | 11 | 9 |
| 71210 | 66 | C | 11 | 9 |
| 71211 | 66 | C | 11 | 9 |
| 71208 | 69 | C | 11 | 9 |
| 71209 | 69 | C | 11 | 9 |
| 71212 | 69 | C | 11 | 9 |
| 71213 | 69 | C | 11 | 9 |
| 71217 | 69 | C | 11 | 9 |
| 71213 | 69 | C | 11 | 9 |
| 71212 | 69 | C | 11 | 9 |
| 71209 | 69 | C | 11 | 9 |
| 71208 | 69 | C | 11 | 9 |
Common Questions About Monroe Water
These are the most common questions residents search for about water quality in Monroe, Louisiana:
Is Monroe water hard or soft? Water hardness varies by source. Monroe's 6 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Monroe tap water? Monroe's water receives a grade of C (63/100). There are 99 health-based violations - consider filtration.
What is the best water filter for Monroe? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Monroe vs. Louisiana Average
Understanding how Monroe compares to the broader Louisiana average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Monroe.
ZIP Codes in Monroe
Monroe spans 11 ZIP codes. The ZIP with the lowest water quality score is 71201. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.