Water Quality in Ponca City, OK: 18 Violations — Grade A
Grade A · Score 87/100 · 5 water systems · Updated 2026-05-03
Ponca City's water meets all EPA standards with no health-based violations.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Reviewing EPA compliance files for Ponca City, OK surfaces 18 documented water violations — each categorized by violation type and linked to the utility that drew the federal citation.
Water Quality by ZIP Code in Ponca City
Water quality varies across Ponca City's 3 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 74601 | B | 81 | 6 | 1 | View report → |
| 74604 | A | 86 | 6 | 1 | View report → |
| 74602 | A | 94 | 6 | 1 | View report → |
Water Quality Overview
Ponca City, Oklahoma receives a water quality grade of A with an overall score of 87 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 5 water systems serving Ponca City have accumulated 18 EPA violations, including 3 health-based violations. These violations are tracked across 3 ZIP codes serving approximately 32,420 people.
What Grade A Means
A grade of A indicates excellent compliance with EPA drinking water standards. Ponca City's water systems have maintained strong performance in both contaminant monitoring and regulatory compliance.
Lead Levels
The average 90th percentile lead level across Ponca City water systems is 0.0020 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 79% of homes built before 1986, Ponca 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.
Water Systems Serving Ponca City
Ponca City is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 32,420 people across 3 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 30 enforcement actions against water systems serving Ponca City. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Ponca 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 Ponca City Water Systems
The following contaminants have been detected or caused violations across Ponca City's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Stage 2 DBP Rule | Treatment Technique | N/A | 6 | 3 | Yes |
| Chlorite | Disinfection Byproducts | 1 mg/L | 3 | 3 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 3 | 3 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 3 | 3 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 3 | 3 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 9 enforcement actions against water systems serving Ponca City. Recent actions:
| Date | Action Type |
|---|---|
| 2025-07-11 | State Informal Action |
| 2025-06-11 | State Informal Action |
| 2025-05-21 | State Order Extension |
| 2025-05-06 | State Informal Action |
| 2025-05-06 | State Informal Enforcement |
| 2024-11-22 | State Informal Action |
| 2024-11-22 | State Informal Enforcement |
| 2024-08-28 | State Formal Action |
| 2024-07-17 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-07-11.
Ponca City vs. Nearby Oklahoma Cities
How Ponca City's water quality compares to similar cities in Oklahoma:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Ponca City | A | 18 | 5 | 32,420 |
| Ada | A | 6 | 4 | 32,154 |
| Shawnee | C | 39 | 5 | 32,108 |
| Collinsville | B | 7 | 2 | 30,775 |
Water Quality by ZIP Code in Ponca City
Water quality varies across Ponca City's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
Common Questions About Ponca City Water
These are the most common questions residents search for about water quality in Ponca City, Oklahoma:
Is Ponca City water hard or soft? Water hardness varies by source. Ponca City's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Ponca City tap water? Ponca City's water receives a grade of A (87/100). There are 3 health-based violations — consider filtration.
What is the best water filter for Ponca City? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Ponca City vs. Oklahoma Average
Understanding how Ponca 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 Ponca City.
ZIP Codes in Ponca City
Ponca City spans 3 ZIP codes. The ZIP with the lowest water quality score is 74601. 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.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade A is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.