Water Quality in Marble City, OK: No Violations - Grade D
Grade D · Score 53/100 · 1 water system · Updated 2026-07-18
Marble City's water has significant violations. Water testing and filtration are recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-07-18
Check EPA compliance data for Marble City, OK and you find zero violations across 1 water system - no MCL exceedances, no monitoring schedule failures, no public health notices, no enforcement orders, and no outstanding compliance actions of any kind documented in the federal Safe Drinking Water Information System.
Water Quality by ZIP Code in Marble City
Marble City is covered by a single ZIP code, so one water-quality profile applies citywide. See the contaminant data below.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 74945 | D | 53 | 0 | 0 | View report → |
Violation Trend
EPA violations recorded for water systems serving Marble City.
Water Quality Overview
Marble City, Oklahoma receives a water quality grade of D with an overall score of 53 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 1 water system serving Marble City. This is a positive indicator, though it does not guarantee the absence of all contaminants - some substances (like PFAS) are not yet fully regulated.
What Grade D Means
A grade of D indicates significant compliance issues. Marble City's water systems have accumulated violations that suggest ongoing water quality challenges. Residents should check their specific ZIP code report and consider water testing or filtration.
Lead Levels
Lead testing data for Marble City is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
With 59% of homes built before 1986, Marble 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
Marble 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 Marble City
Marble City is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 161 people across 1 ZIP code.
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 Marble City. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Marble 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
Violation Trend Over Time
Year-by-year EPA violations recorded for water systems serving Marble City:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2021 | 1 | 1 |
| 2024 | 1 | 1 |
Violation counts have remained stable over the observed period.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Marble City. Recent actions:
| Date | Action Type |
|---|---|
| 2026-03-05 | EPA Formal Action |
| 2025-07-11 | State Informal Action |
| 2025-07-01 | State Order Extension |
| 2025-06-27 | State Informal Action |
| 2025-06-27 | State Informal Enforcement |
| 2023-07-31 | State Order Extension |
| 2023-07-28 | State Informal Action |
| 2023-03-14 | State Informal Action |
| 2023-03-14 | State Informal Enforcement |
| 2022-07-14 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2026-03-05.
Marble City vs. Nearby Oklahoma Cities
How Marble City's water quality compares to similar cities in Oklahoma:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Marble City | D | 0 | 1 | 161 |
| Connerville | C | 0 | 1 | 163 |
| Crawford | C | 0 | 1 | 159 |
| Blanco | B | 0 | 3 | 157 |
Common Questions About Marble City Water
These are the most common questions residents search for about water quality in Marble City, Oklahoma:
Is Marble City water hard or soft? Water hardness varies by source. Marble City's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Marble City tap water? Marble City's water receives a grade of D (53/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Marble City? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Marble City vs. Oklahoma Average
Understanding how Marble City compares to the broader Oklahoma 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 Marble City.
ZIP Codes in Marble City
Marble City spans 1 ZIP code. 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.