Enid
EPA ID: OK2002412 · 49,347 people served · 15 ZIP codes
Per EPA records, Enid: 13 unresolved violations, 49,347 people in 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 5 (2021) to 5 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Enid Source: EPA SDWIS service area boundaries.
Service area boundary — Grade B
Service Area Demographics
The Enid serves a community with a median household income of $74,868 and an estimated 63,206 residents across its service area. Approximately 74% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 35% 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?
Enid's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 2% of homes in Garfield 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 Enid compares to EPA limits
What This Means For You
Arsenic at 10 mg/L exceeds the EPA maximum of 0.01 mg/L.
Uranium at 3 mg/L exceeds the EPA maximum of 0.03 mg/L. Kidney toxicity, increased cancer risk. Consider reverse osmosis filtration.
Total Trihalomethanes (TTHM) at 3 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Barium at 8 mg/L exceeds the EPA maximum of 2 mg/L.
Contaminant 2959 at 4 mg/L exceeds the EPA maximum of mg/L.
Uranium was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Oklahoma
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
Enid (EPA ID: OK2002412) is a community water system in Oklahoma that serves approximately 49,347 people from groundwater sources.
This system provides water to 15 ZIP codes across 11 communities.
Average Home Safety Score: B (82/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 1, 2025 | Barium | Health-based | Unresolved |
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Resolved |
| April 1, 2025 | Arsenic | Health-based | Unresolved |
| April 1, 2025 | Contaminant 2105 | Monitoring | Unresolved |
| April 1, 2025 | Barium | Health-based | Unresolved |
| April 1, 2025 | Contaminant 2959 | Monitoring | Unresolved |
| January 1, 2025 | Barium | Health-based | Resolved |
| January 1, 2025 | Contaminant 2959 | Monitoring | Unresolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Resolved |
| October 1, 2024 | Barium | Health-based | Resolved |
| October 1, 2024 | Stage 1 DBP Rule | Monitoring | Resolved |
| October 1, 2024 | Contaminant 2959 | Monitoring | Unresolved |
| July 1, 2024 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2024 | Barium | Health-based | Unresolved |
| July 1, 2024 | Contaminant 2051 | Monitoring | Resolved |
| July 1, 2024 | Contaminant 2959 | Monitoring | Unresolved |
| April 1, 2024 | Arsenic | Monitoring | Resolved |
| April 1, 2024 | Barium | Health-based | Unresolved |
| January 1, 2024 | Total Trihalomethanes (TTHM) | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Arsenic | Inorganic | 10 | Yes |
| Barium | Inorganic | 8 | Yes |
| Contaminant 2959 | Other Violation | 4 | No |
| Stage 2 DBP Rule | Treatment Failure | 4 | Yes |
| Uranium | Radionuclides | 3 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 3 | No |
| Total Organic Carbon | Disinfection Byproducts | 3 | No |
| Contaminant 2040 | Other Violation | 1 | No |
| Contaminant 2051 | Other Violation | 1 | No |
| Contaminant 2105 | Other Violation | 1 | No |
| Total Coliform | Microbiological | 1 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
| Revised Total Coliform Rule | Microbiological | 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 |
|---|---|---|---|
| 73735 | 0.0112 mg/L | No | N/A |
| 73773 | 0.0068 mg/L | No | N/A |
| 73701 | 0.0051 mg/L | No | N/A |
| 73702 | 0.0051 mg/L | No | N/A |
| 73703 | 0.0051 mg/L | No | N/A |
| 73705 | 0.0051 mg/L | No | N/A |
| 73706 | 0.0051 mg/L | No | N/A |
| 73760 | 0.0033 mg/L | No | N/A |
| 73729 | 0.0026 mg/L | No | N/A |
| 73718 | 0.0013 mg/L | No | N/A |
| 73768 | 0.0007 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: 12 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 3 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.
- 73701 — Enid
- 73702 — Enid
- 73703 — Enid
- 73705 — Enid
- 73706 — Enid
- 73716 — Aline
- 73718 — Ames
- 73727 — Carrier
- 73729 — Cleo Springs
- 73735 — Drummond
- 73738 — Garber
- 73754 — Lahoma
- 73760 — Meno
- 73768 — Ringwood
- 73773 — Waukomis
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Enid (OK2002412) on EPA.gov.
Frequently Asked Questions
Is Enid water safe to drink?
Enid has recorded 10 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Enid serve?
Enid serves approximately 49,347 people across 15 ZIP codes in Oklahoma.
Where does Enid get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
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.
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
- #34 / 50 Highest Exposure Burden (Oklahoma)
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
Enid (EPA ID: OK2002412) — request the latest Consumer Confidence Report or ask about specific contaminants.