Oklahoma City
EPA ID: OK1020902 · 644,000 people served · 95 ZIP codes
Federal data shows 2 unresolved violations at Oklahoma City — roughly 644,000 residents in the service area.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 6 (2022) to 9 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Oklahoma City Source: EPA SDWIS service area boundaries.
Service area boundary — Grade A
Service Area Demographics
The Oklahoma City serves a community with a median household income of $68,432 and an estimated 1,134,119 residents across its service area. Approximately 57% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 43% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
🌊 Where Does Your Water Come From?
Oklahoma City's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in Oklahoma County, Oklahoma rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Oklahoma City compares to EPA limits
What This Means For You
Total Trihalomethanes (TTHM) at 1 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Contaminant 4100 at 1 mg/L exceeds the EPA maximum of mg/L.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 88 detections recorded. 3 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Total Trihalomethanes (TTHM) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
OKLAHOMA CITY (EPA ID: OK1020902) is a community water system in Oklahoma that serves approximately 644,000 people from surface water sources.
This system provides water to 95 ZIP codes across 13 communities.
Average Home Safety Score: A (90/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 1 | No |
| Contaminant 4100 | Other Violation | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 73101 | 0.0041 mg/L | No | N/A |
| 73102 | 0.0041 mg/L | No | N/A |
| 73103 | 0.0041 mg/L | No | N/A |
| 73104 | 0.0041 mg/L | No | N/A |
| 73105 | 0.0041 mg/L | No | N/A |
| 73106 | 0.0041 mg/L | No | N/A |
| 73107 | 0.0041 mg/L | No | N/A |
| 73108 | 0.0041 mg/L | No | N/A |
| 73109 | 0.0041 mg/L | No | N/A |
| 73111 | 0.0041 mg/L | No | N/A |
| 73112 | 0.0041 mg/L | No | N/A |
| 73113 | 0.0041 mg/L | No | N/A |
| 73114 | 0.0041 mg/L | No | N/A |
| 73115 | 0.0041 mg/L | No | N/A |
| 73116 | 0.0041 mg/L | No | N/A |
| 73117 | 0.0041 mg/L | No | N/A |
| 73118 | 0.0041 mg/L | No | N/A |
| 73119 | 0.0041 mg/L | No | N/A |
| 73120 | 0.0041 mg/L | No | N/A |
| 73121 | 0.0041 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 56 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 39 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 95 ZIP codes:
73003 · 73007 · 73008 · 73012 · 73013 73020 · 73026 · 73034 · 73036 · 73049 73064 · 73071 · 73078 · 73084 · 73097 73099 · 73101 · 73102 · 73103 · 73104 73105 · 73106 · 73107 · 73108 · 73109 73110 · 73111 · 73112 · 73113 · 73114 73115 · 73116 · 73117 · 73118 · 73119 73120 · 73121 · 73122 · 73123 · 73124 73125 · 73126 · 73127 · 73128 · 73129 73130 · 73131 · 73132 · 73134 · 73135 73136 · 73137 · 73139 · 73140 · 73141 73142 · 73143 · 73144 · 73145 · 73146 73147 · 73148 · 73149 · 73150 · 73151 73152 · 73153 · 73154 · 73155 · 73156 73157 · 73159 · 73160 · 73162 · 73163 73164 · 73165 · 73167 · 73169 · 73170 73172 · 73173 · 73178 · 73179 · 73184 73185 · 73189 · 73190 · 73193 · 73194 73195 · 73196 · 73197 · 73198 · 73199
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Oklahoma City (OK1020902) on EPA.gov.
Frequently Asked Questions
Is Oklahoma City water safe to drink?
Oklahoma City has only monitoring/reporting violations, which are procedural in nature. The system meets federal health-based standards.
How many people does Oklahoma City serve?
Oklahoma City serves approximately 644,000 people across 95 ZIP codes in Oklahoma.
Where does Oklahoma City get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Oklahoma City (EPA ID: OK1020902) — request the latest Consumer Confidence Report or ask about specific contaminants.