Water Quality in Farmington, MO: 13 Violations — Grade C
Grade C · Score 68/100 · 5 water systems · Updated 2026-05-03
Farmington'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
Drinking water compliance data for Farmington, MO reflects 13 EPA violations — details in the grid below.
Water Quality by ZIP Code in Farmington
Water quality varies across Farmington's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 63640 | C | 68 | 13 | 6 | View report → |
Violation Trend
EPA violations recorded for water systems serving Farmington.
Water Quality Overview
Farmington, Missouri receives a water quality grade of C with an overall score of 68 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 5 water systems serving Farmington have accumulated 13 EPA violations, including 6 health-based violations. These violations are tracked across 1 ZIP codes serving approximately 23,504 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Farmington'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 Farmington water systems is 0.0048 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 48% of homes built before 1986, Farmington 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
Farmington is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Farmington
Farmington is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 23,504 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 Farmington. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Farmington
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 Farmington Water Systems
The following contaminants have been detected or caused violations across Farmington's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Surface Water Treatment Rule | Treatment Technique | N/A | 5 | 1 | No |
| Gross Beta | Radionuclides | 50 pCi/L | 3 | 1 | Yes |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 3 | 1 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 2 | 1 | No |
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 Farmington:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2024 | 5 | 5 |
| 2025 | 1 | 1 |
Violations have decreased from 5 in 2024 to 1 in 2025, indicating improving compliance.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Farmington. Recent actions:
| Date | Action Type |
|---|---|
| 2025-09-18 | State Order Extension |
| 2025-09-03 | State Informal Enforcement |
| 2025-09-03 | State Filed Judgment |
| 2025-05-30 | State Informal Action |
| 2025-03-24 | State Order Extension |
| 2025-02-24 | State Filed Judgment |
| 2025-02-24 | State Informal Enforcement |
| 2025-01-09 | State Filed Judgment |
| 2025-01-09 | State Informal Enforcement |
| 2025-01-06 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-09-18.
Farmington vs. Nearby Missouri Cities
How Farmington's water quality compares to similar cities in Missouri:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Farmington | C | 13 | 5 | 23,504 |
| Rolla | B | 9 | 5 | 23,351 |
| Jackson | B | 5 | 5 | 24,247 |
| Grandview | C | 0 | 1 | 24,500 |
Common Questions About Farmington Water
These are the most common questions residents search for about water quality in Farmington, Missouri:
Is Farmington water hard or soft? Water hardness varies by source. Farmington's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Farmington tap water? Farmington's water receives a grade of C (68/100). There are 6 health-based violations — consider filtration.
What is the best water filter for Farmington? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Farmington vs. Missouri Average
Understanding how Farmington 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 Farmington.
ZIP Codes in Farmington
Farmington spans 1 ZIP code. The ZIP with the lowest water quality score is 63640. 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.