Shawnee Municipal Authority
EPA ID: OK1020504 · 29,990 people served · 4 ZIP codes
ZipCheckup's reading of EPA SDWIS for Shawnee Municipal Authority (OK1020504): 4 past health-based violations, since resolved. In the five-year tracking period, Shawnee Municipal Authority filed 8 violations - each has been cleared, and the utility now meets all federal standards for its 29,990 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Shawnee Municipal Authority Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Shawnee Municipal Authority serves a community with a median household income of $60,359 and an estimated 66,403 residents across its service area. Approximately 59% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 100% 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?
Shawnee Municipal Authority'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.
Infrastructure Risk
Detected Contaminants
How Shawnee Municipal Authority compares to EPA limits
What This Means For You
Chlorite at 8 mg/L exceeds the EPA maximum of 1 mg/L. Anemia and nervous system effects in infants and children. Consider ferrous sulfate reduction filtration.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 7 detections recorded. 1 exceeds federal EPA limits (4 ppt for PFOA/PFOS).
Chlorite was detected in this water system. ferrous sulfate reduction 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
Shawnee Municipal Authority (EPA ID: OK1020504) is a community water system in Oklahoma that serves approximately 29,990 people from surface water sources.
This system provides water to 4 ZIP codes across 3 communities.
Violation History
Status breakdown for accepted records with record years 2021-2026: 2 resolved, 6 archived, 0 addressed, and 0 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 | Chlorite | Non-health-based | Archived |
| February 1, 2026 | Chlorite | Non-health-based | Archived |
| October 1, 2025 | Chlorite | Health-based | Archived |
| July 1, 2025 | Chlorite | Health-based | Archived |
| April 1, 2025 | Chlorite | Health-based | Archived |
| January 1, 2025 | Chlorite | Health-based | Archived |
| September 1, 2024 | Chlorite | Non-health-based | Resolved |
| September 1, 2024 | Chlorite | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Chlorite | Disinfection Byproducts | 8 | Yes |
Health Risk Details
Chlorite (EPA limit: 1 mg/L)
Anemia and nervous system effects in infants and children At-risk groups: infants, developing fetuses, people with G6PD deficiency.
Removal methods: ferrous sulfate reduction, activated carbon, reverse osmosis. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0028 mg/L | No | N/A |
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
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: 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 the full compliance record for Shawnee Municipal Authority (OK1020504) on EPA.gov.
Frequently Asked Questions
Is Shawnee Municipal Authority water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Shawnee Municipal Authority; its 8 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Shawnee Municipal Authority serve?
Shawnee Municipal Authority serves approximately 29,990 people across 4 ZIP codes in Oklahoma.
Where does Shawnee Municipal Authority 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 →
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.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Shawnee Municipal Authority (OK): 4 Health Violations. https://zipcheckup.com/water-system/ok1020504/
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title = {{Shawnee Municipal Authority (OK): 4 Health Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ok1020504/}
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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
Shawnee Municipal Authority (EPA ID: OK1020504) - request the latest Consumer Confidence Report or ask about specific contaminants.