Water Quality in Davis, OK: 28 Violations — Grade A
Grade A · Score 86/100 · 1 water system · Updated 2026-05-03
Davis's water meets all EPA standards with no health-based violations.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Water systems in Davis, OK have accumulated 28 EPA violations across the full compliance record — a dataset that captures reportable health-based exceedances, monitoring lapses, and enforcement actions filed with the federal Safe Drinking Water Information System.
Water Quality by ZIP Code in Davis
Water quality varies across Davis's 2 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 73030 | A | 85 | 14 | 7 | View report → |
| 73039 | A | 87 | 14 | 7 | View report → |
Violation Trend
EPA violations recorded for water systems serving Davis.
Water Quality Overview
Davis, Oklahoma receives a water quality grade of A with an overall score of 86 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Davis have accumulated 28 EPA violations, including 14 health-based violations. These violations are tracked across 2 ZIP codes serving approximately 2,610 people.
What Grade A Means
A grade of A indicates excellent compliance with EPA drinking water standards. Davis's water systems have maintained strong performance in both contaminant monitoring and regulatory compliance.
Lead Levels
The average 90th percentile lead level across Davis water systems is 0.0011 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 58% of homes built before 1986, Davis 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 Davis
Davis is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 2,610 people across 2 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 20 enforcement actions against water systems serving Davis. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Davis
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 Davis Water Systems
The following contaminants have been detected or caused violations across Davis's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| E. coli | Microbiological | N/A | 6 | 2 | Yes |
| Uranium | Radionuclides | 0.03 mg/L | 4 | 2 | No |
| Chlorite | Disinfection Byproducts | 1 mg/L | 4 | 2 | No |
| Fecal Coliform | Microbiological | N/A | 4 | 2 | Yes |
| Stage 2 DBP Rule | Treatment Technique | N/A | 4 | 2 | Yes |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 2 | 2 | Yes |
| Benzene | Organic | 0.005 mg/L | 2 | 2 | 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 Davis:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2023 | 2 | 2 |
| 2024 | 2 | 2 |
| 2025 | 10 | 10 |
Violations have increased from 2 in 2023 to 10 in 2025. This trend warrants monitoring.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Davis. Recent actions:
| Date | Action Type |
|---|---|
| 2025-09-17 | State Order Extension |
| 2025-08-29 | State Order Extension |
| 2025-08-13 | State Informal Action |
| 2025-08-13 | State Informal Enforcement |
| 2025-07-17 | State Informal Action |
| 2025-07-15 | State Order Extension |
| 2025-07-11 | State Informal Action |
| 2025-06-16 | State Filed Suit |
| 2025-06-16 | State Informal Enforcement |
| 2025-05-02 | State Order Extension |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-09-17.
Davis vs. Nearby Oklahoma Cities
How Davis's water quality compares to similar cities in Oklahoma:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Davis | A | 28 | 1 | 2,610 |
| Marietta | A | 0 | 1 | 2,626 |
| Wayne | A | 11 | 2 | 2,585 |
| Hominy | C | 186 | 1 | 2,584 |
Common Questions About Davis Water
These are the most common questions residents search for about water quality in Davis, Oklahoma:
Is Davis water hard or soft? Water hardness varies by source. Davis's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Davis tap water? Davis's water receives a grade of A (86/100). There are 14 health-based violations — consider filtration.
What is the best water filter for Davis? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Davis vs. Oklahoma Average
Understanding how Davis 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 Davis.
ZIP Codes in Davis
Davis spans 2 ZIP codes. The ZIP with the lowest water quality score is 73030. 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.