Great Oak Subdivision
EPA ID: MO6036386 · 30 people served · 1 ZIP code
Five years of EPA monitoring have produced no violations for Great Oak Subdivision — the supplier serving 30 residents has kept every contaminant level within federal limits, a result that places it among the top-performing utilities for systems with a service population of comparable size.
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 1 (2023) to 1 (2024). The pattern suggests growing compliance challenges.
Service Area Demographics
The Great Oak Subdivision serves a community with a median household income of $79,803 and an estimated 10,856 residents across its service area.
Environmental Justice Note: 60% 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?
Great Oak Subdivision'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 0% of homes in Warren County, Missouri rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Missouri
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
Great Oak Subdivision (EPA ID: MO6036386) is a community water system in Missouri that serves approximately 30 people from groundwater sources.
This system serves ZIP code 63390 in Wright City.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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
- 63390 — Wright City
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Great Oak Subdivision (MO6036386) on EPA.gov.
Frequently Asked Questions
Is Great Oak Subdivision water safe to drink?
Based on EPA records, Great Oak Subdivision has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Great Oak Subdivision serve?
Great Oak Subdivision serves approximately 30 people across 1 ZIP code in Missouri.
Where does Great Oak Subdivision get its water?
The primary water source is groundwater.