Grand Lake Pwa
EPA ID: OK1021691 · 2,800 people served · 1 ZIP code
ZipCheckup's reading of EPA SDWIS for Grand Lake Pwa (OK1021691): 3 past health-based violations, since resolved. Even though Grand Lake Pwa accumulated 13 violations over five years, all have been formally resolved - the provider currently meets EPA standards for 2,800 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Grand Lake Pwa Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Grand Lake Pwa serves a community with a median household income of $58,307 and an estimated 7,110 residents across its service area. Approximately 49% 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?
Grand Lake Pwa'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.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Detected Contaminants
How Grand Lake Pwa compares to EPA limits
What This Means For You
Gross Alpha at 2 pCi/L exceeds the EPA maximum of pCi/L. Increased cancer risk from radioactive particles. Consider reverse osmosis filtration.
Contaminant 4100 at 2 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Gross Alpha was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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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
Grand Lake Pwa (EPA ID: OK1021691) is a community water system in Oklahoma that serves approximately 2,800 people from groundwater sources.
This system serves ZIP code 74331 in Afton.
Violation History
Status breakdown for accepted records with record years 2021-2026: 11 resolved, 2 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 |
|---|---|---|---|
| July 1, 2025 | Gross Beta | Health-based | Archived |
| October 1, 2024 | Stage 1 DBP Rule | Non-health-based | Resolved |
| January 1, 2024 | Gross Beta | Health-based | Resolved |
| October 2, 2023 | Surface Water Treatment Rule | Non-health-based | Resolved |
| October 1, 2023 | Gross Beta | Health-based | Archived |
| April 1, 2022 | Gross Alpha | Non-health-based | Resolved |
| April 1, 2022 | Combined Radium | Non-health-based | Resolved |
| April 1, 2022 | Gross Beta | Non-health-based | Resolved |
| April 1, 2022 | Contaminant 4100 | Non-health-based | Resolved |
| January 1, 2022 | Gross Alpha | Non-health-based | Resolved |
| January 1, 2022 | Combined Radium | Non-health-based | Resolved |
| January 1, 2022 | Gross Beta | Non-health-based | Resolved |
| January 1, 2022 | Contaminant 4100 | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Gross Beta | Radionuclides | 5 | Yes |
| Gross Alpha | Radionuclides | 2 | No |
| Combined Radium | Radionuclides | 2 | No |
| Contaminant 4100 | Other Violation | 2 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
| Surface Water Treatment Rule | Treatment Failure | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0031 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.
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.
- 74331 - Afton
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Grand Lake Pwa (OK1021691) on EPA.gov.
Frequently Asked Questions
Is Grand Lake Pwa water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Grand Lake Pwa; its 13 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Grand Lake Pwa serve?
Grand Lake Pwa serves approximately 2,800 people across 1 ZIP code in Oklahoma.
Where does Grand Lake Pwa get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Grand Lake Pwa (OK): 3 Health Violations. https://zipcheckup.com/water-system/ok1021691/
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author = {{ZipCheckup}},
title = {{Grand Lake Pwa (OK): 3 Health Violations}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/ok1021691/}
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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
Grand Lake Pwa (EPA ID: OK1021691) - request the latest Consumer Confidence Report or ask about specific contaminants.