Water Quality in Monroe City, MO: 16 Violations — Grade C
Grade C · Score 58/100 · 1 water system · Updated 2026-05-03
Monroe City's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
On record with EPA: Monroe City, MO has 16 water violations.
Water Quality by ZIP Code in Monroe City
Water quality varies across Monroe City's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 63456 | C | 58 | 16 | 10 | View report → |
Violation Trend
EPA violations recorded for water systems serving Monroe City.
Water Quality Overview
Monroe City, Missouri receives a water quality grade of C with an overall score of 58 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Monroe City have accumulated 16 EPA violations, including 10 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 2,500 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Monroe City'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 City water systems is 0.0020 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 62% of homes built before 1986, Monroe City 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.
Radon Risk
Monroe City is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Monroe City
Monroe City is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 2,500 people across 1 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 10 enforcement actions against water systems serving Monroe City. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Monroe City
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 City Water Systems
The following contaminants have been detected or caused violations across Monroe City's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 9 | 1 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 4 | 1 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 1 | 1 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 1 | 1 | 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 City:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2021 | 1 | 1 |
| 2022 | 1 | 1 |
| 2023 | 2 | 2 |
| 2024 | 3 | 3 |
| 2025 | 4 | 4 |
Violations have increased from 1 in 2021 to 4 in 2025. This trend warrants monitoring.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Monroe City. Recent actions:
| Date | Action Type |
|---|---|
| 2025-09-23 | State Informal Action |
| 2025-09-16 | State Order Extension |
| 2025-08-14 | State Informal Enforcement |
| 2025-08-14 | State Filed Judgment |
| 2025-05-23 | State Informal Enforcement |
| 2025-05-23 | State Filed Judgment |
| 2025-03-11 | State Informal Enforcement |
| 2025-03-11 | State Filed Judgment |
| 2025-02-21 | State Informal Action |
| 2024-12-20 | State Informal Enforcement |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-09-23.
Monroe City vs. Nearby Missouri Cities
How Monroe City's water quality compares to similar cities in Missouri:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Monroe City | C | 16 | 1 | 2,500 |
| Daisy | D | 0 | 1 | 2,500 |
| Millersville | B | 2 | 1 | 2,500 |
| Oak Ridge | D | 0 | 1 | 2,500 |
Common Questions About Monroe City Water
These are the most common questions residents search for about water quality in Monroe City, Missouri:
Is Monroe City water hard or soft? Water hardness varies by source. Monroe City's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Monroe City tap water? Monroe City's water receives a grade of C (58/100). There are 10 health-based violations — consider filtration.
What is the best water filter for Monroe City? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Monroe City vs. Missouri Average
Understanding how Monroe City compares to the broader Missouri 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 City.
ZIP Codes in Monroe City
Monroe City spans 1 ZIP code. The ZIP with the lowest water quality score is 63456. 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.