Tonkawa
EPA ID: OK2003603 · 3,299 people served · 4 ZIP codes
ZipCheckup's reading of EPA records for Tonkawa (OK2003603): 1 violation recorded with unresolved status in the SDWIS data used. Open violations at Tonkawa number 1 in the EPA compliance data, for a system that serves about 3,299 people. An open status describes how each violation is logged in the federal record; it is not a measurement of what comes out of any individual tap.
Data: EPA SDWIS
Service Area Map
Coverage area for Tonkawa Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Tonkawa have a median household income of $62,216 and about 11,255 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 88% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: On average, 48% of census tracts in the counties mapped to this service area are designated disadvantaged by the federal Climate and Economic Justice Screening Tool (CEJST, 2022 version). 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?
Tonkawa's water is classified in EPA records as a groundwater source. 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.
Infrastructure Risk
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
Tonkawa (EPA ID: OK2003603) is a community water system in Oklahoma that serves approximately 3,299 people from groundwater sources.
This system provides water to 4 ZIP codes across 4 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 4 resolved, 2 archived, 0 addressed, and 1 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| February 1, 2026 | Chlorine | Non-health-based | Archived |
| February 1, 2026 | Revised Total Coliform Rule | Non-health-based | Archived |
| August 14, 2025 | E. COLI | Non-health-based | Unaddressed (current) |
| October 17, 2024 | LEAD AND COPPER RULE REVISIONS | Health-based | Resolved |
| October 17, 2024 | LEAD AND COPPER RULE REVISIONS | Non-health-based | Resolved |
| October 1, 2022 | TTHM | Non-health-based | Resolved |
| October 1, 2022 | Total Haloacetic Acids (HAA5) | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | Treatment Technique, Monitoring & Reporting | 2 | Yes |
| Total Haloacetic Acids (HAA5) | Monitoring & Reporting | 1 | No |
| TTHM | Monitoring & Reporting | 1 | No |
| E. COLI | Monitoring & Reporting | 1 | No |
| Chlorine | Monitoring & Reporting | 1 | No |
| Chlorine | Monitoring & Reporting | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0064 mg/L | No | 2025-12-31 |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
4 of 4 ZIP records with known zones are in EPA Radon Zone 3.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by OK or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Tonkawa (OK2003603) on EPA.gov.
Frequently Asked Questions
Is Tonkawa water safe to drink?
The accepted 2026Q2 ECHO snapshot shows 1 current noncompliance record and zero current records classified as health-based. That classification is not a property-specific water test or safety guarantee.
How many people does Tonkawa serve?
Tonkawa serves approximately 3,299 people across 4 ZIP codes in Oklahoma.
Where does Tonkawa get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Tonkawa (OK): 1 Health Violation. https://zipcheckup.com/water-system/ok2003603/
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title = {{Tonkawa (OK): 1 Health Violation}},
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url = {https://zipcheckup.com/water-system/ok2003603/}
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What You Can Do
Test your water
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Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Tonkawa (EPA ID: OK2003603) - request the latest Consumer Confidence Report or ask about specific contaminants.