Water Quality in Norman, OK: 150 Violations - Grade N/A
7 water systems · 6 directly mapped ZIP records
Available EPA records report 150 violations across 6 directly mapped ZIP records with known counts for Norman. This is compliance evidence, not a property-level tap-water verdict.
Data: EPA Safe Drinking Water Information System (SDWIS)
Water Quality by ZIP Code in Norman
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 73072 | 87 | 9 | View report → |
| 73026 | 66 | 4 | View report → |
| 73069 | 62 | 5 | View report → |
| 73071 | 62 | 5 | View report → |
| 73019 | 3 | 1 | View report → |
| 73070 | 3 | 1 | View report → |
Violation Trend
EPA violations recorded for water systems serving Norman.
| Year | Total violations | Health-based |
|---|---|---|
| 2022 | 4 | 4 |
| 2023 | 4 | 4 |
| 2024 | 15 | 15 |
Water Quality Overview
Norman, Oklahoma has directly mapped EPA water-system data for 6 ZIP codes. This page reports typed compliance facts and does not relabel the multi-source Home Safety Score as a drinking-water grade.
The available EPA records report 150 violations, including 12 health-based violations across 6 directly mapped ZIP records with reported counts.
Lead Levels
The average 90th percentile lead level across Norman water systems is 0.0042 mg/L - within EPA limits. 1 ZIP code exceed the EPA lead action level.
With 48% of homes built before 1986, Norman 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 Norman
Norman is served by 7 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 133,176 people across 6 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 52 enforcement actions against water systems serving Norman. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Norman
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels and violation history
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 Norman Water Systems
The following contaminants have been detected or caused violations across Norman's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Stage 2 DBP Rule | Treatment Technique | N/A | 24 | 6 | Yes |
| Atrazine | Organic | 0.003 mg/L | 10 | 6 | No |
| Barium | Inorganic | 2 mg/L | 9 | 3 | Yes |
| Revised Total Coliform Rule | Microbiological | N/A | 4 | 2 | No |
| Benzene | Organic | 0.005 mg/L | 4 | 4 | No |
| Gross Alpha | Radionuclides | 15 pCi/L | 4 | 4 | No |
| Combined Radium | Radionuclides | 5 pCi/L | 4 | 4 | No |
| Gross Beta | Radionuclides | 50 pCi/L | 4 | 4 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 4 | 1 | No |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 0.06 mg/L | 4 | 1 | No |
| Arsenic | Inorganic | 0.01 mg/L | 3 | 2 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 3 | 2 | No |
| PFOA | PFAS | 0.000004 mg/L | 3 | 3 | No |
| PFNA | PFAS | 0.00001 mg/L | 3 | 3 | No |
| Monochloroacetic Acid | Disinfection Byproducts | 0.06 mg/L | 3 | 3 | 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 Norman:
| Year | Total Violations | Health-Based |
|---|---|---|
| 2022 | 4 | 4 |
| 2023 | 4 | 4 |
| 2024 | 15 | 15 |
Violations have increased from 4 in 2022 to 15 in 2024. This trend warrants monitoring.
EPA Enforcement History
The EPA and state regulators have taken 24 enforcement actions against water systems serving Norman. Recent actions:
| Date | Action Type |
|---|---|
| 2026-03-25 | EPA Formal Action |
| 2026-03-05 | State Order Extension |
| 2026-02-19 | State Informal Action |
| 2026-02-19 | State Informal Enforcement |
| 2026-01-27 | State Informal Action |
| 2026-01-27 | State Informal Enforcement |
| 2025-12-08 | State Order Extension |
| 2025-11-21 | State Informal Action |
| 2025-11-21 | State Informal Enforcement |
| 2025-10-15 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2026-03-25.
Norman vs. Nearby Oklahoma Cities
How Norman's water quality compares to similar cities in Oklahoma:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| Norman | 6 | 150 | 7 | 133,176 |
| Broken Arrow | 3 | 118 | 7 | 140,162 |
| Lawton | 3 | 56 | 10 | 89,537 |
| Yukon | 1 | 124 | 5 | 86,749 |
Recommended Water Filters for Norman
Based on contaminants detected in Norman's water supply, these filter types are recommended:
Reverse Osmosis (under-sink)
- Removes: Gross Alpha
- Effectiveness: 85-99%
- Cost range: $150–$600
- Certification: NSF/ANSI 58
- Recommended products:
Water Quality by ZIP Code in Norman
EPA coverage and recorded violations can differ across Norman's ZIP codes. Missing counts are shown as unavailable, not zero:
Common Questions About Norman Water
These are the most common questions residents search for about water quality in Norman, Oklahoma:
Is Norman water hard or soft? Water hardness varies by source. Norman's 7 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Norman tap water? City-level EPA records cannot determine safety at a specific tap. The measured subset contains 12 health-based violations; check the affected utility record and consider certified testing.
What is the best water filter for Norman? Based on detected contaminants, a reverse osmosis (under-sink) filter is most recommended. See our Water Filter Matcher for personalized recommendations.
Norman vs. Oklahoma Average
Understanding how Norman 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 Norman.
ZIP Codes in Norman
Norman spans 6 ZIP codes. EPA water-system coverage is available for 6 directly mapped ZIP codes. 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
Source reporting periods vary. See each cited source for its publication schedule.