Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03

Oklahoma City, OK has 158 violations in the EPA compliance history — breakdown below.

Water Quality Map: Oklahoma City, OK

Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.

A B C D F

Water Quality by ZIP Code in Oklahoma City

Water quality varies across Oklahoma City's 79 ZIP codes. Check your specific ZIP for detailed contaminant data.

ZIP Code	Grade	Score	Violations	Health
73119	B	76	2	0	View report →
73109	B	81	2	0	View report →
73112	B	81	2	0	View report →
73115	B	81	2	0	View report →
73116	B	81	2	0	View report →
73118	B	81	2	0	View report →
73120	B	81	2	0	View report →
73127	B	81	2	0	View report →
73132	B	81	2	0	View report →
73139	B	81	2	0	View report →
73141	B	81	2	0	View report →
73159	B	81	2	0	View report →
73106	A	86	2	0	View report →
73108	A	86	2	0	View report →
73110	A	86	2	0	View report →

Water Quality Overview

Oklahoma City, Oklahoma receives a water quality grade of A with an overall score of 90 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).

The 5 water systems serving Oklahoma City have accumulated 158 EPA violations (all monitoring/reporting type). These violations are tracked across 79 ZIP codes serving approximately 676,545 people.

What Grade A Means

A grade of A indicates excellent compliance with EPA drinking water standards. Oklahoma City's water systems have maintained strong performance in both contaminant monitoring and regulatory compliance.

Lead Levels

The average 90th percentile lead level across Oklahoma City water systems is 0.0041 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.

With 61% of homes built before 1986, Oklahoma 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 Oklahoma City

Oklahoma City is served by 5 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 676,545 people across 79 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 790 enforcement actions against water systems serving Oklahoma City. Enforcement actions range from informal compliance assistance to formal orders and penalties.

How to Check Your Water in Oklahoma City

1. Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores

2. Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants

3. 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

4. Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics

5. Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts

Contaminants Detected in Oklahoma City Water Systems

The following contaminants have been detected or caused violations across Oklahoma City's water systems:

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 Oklahoma City. Recent actions:

Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-07-15.

Oklahoma City vs. Nearby Oklahoma Cities

How Oklahoma City's water quality compares to similar cities in Oklahoma:

Recommended Water Filters for Oklahoma City

Based on contaminants detected in Oklahoma City's water supply, these filter types are recommended:

Granular Activated Carbon (GAC, under-sink or whole-house)

• Removes: TOTAL HALOACETIC ACIDS (HAA5)
• Effectiveness: 60-80%
• Cost range: $100–$600
• Certification: NSF/ANSI 53
• Recommended products:
  • Aquasana AQ-5200
  • Aquasana EQ-1000 Rhino

Granular Activated Carbon (GAC, whole-house POE)

• Removes: TTHM
• Effectiveness: 80-99%
• Cost range: $400–$2000
• Certification: NSF/ANSI 53
• Recommended products:
  • Aquasana AQ-5200
  • Aquasana EQ-1000 Rhino

Ion Exchange Water Softener (POE)

• Removes: COMBINED RADIUM (-226 & -228)
• Effectiveness: 90-97%
• Cost range: $500–$2500
• Certification: NSF/ANSI 44
• Recommended products:
  • Waterdrop G3P800
  • Fleck 5600SXT Softener

Water Quality by ZIP Code in Oklahoma City

Water quality varies across Oklahoma City's ZIP codes. The table below shows the worst-scoring and best-scoring areas:

Common Questions About Oklahoma City Water

These are the most common questions residents search for about water quality in Oklahoma City, Oklahoma:

Is Oklahoma City water hard or soft? Water hardness varies by source. Oklahoma City's 5 water systems use multiple sources. Check your ZIP code report for specific hardness data.

Can I drink Oklahoma City tap water? Oklahoma City's water receives a grade of A (90/100). No health-based violations have been recorded, but home testing is always recommended.

What is the best water filter for Oklahoma City? Based on detected contaminants, a granular activated carbon (gac, under-sink or whole-house) filter is most recommended. See our Water Filter Matcher for personalized recommendations.

Oklahoma City vs. Oklahoma Average

Understanding how Oklahoma 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 Oklahoma City.

ZIP Codes in Oklahoma City

Oklahoma City spans 79 ZIP codes. The ZIP with the lowest water quality score is 73101. 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.

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.