Sentinel Public Water System
EPA ID: OK3007505 · 859 people served · 1 ZIP code
Water monitoring for Sentinel Public Water System: clean, five years, 859 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Sentinel Public Water System Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Sentinel Public Water System serves a community with a median household income of $95,500 and an estimated 1,115 residents across its service area. Approximately 94% 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?
Sentinel Public Water System'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 1% of homes in Washita 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
Comparable Water Systems
Similar-sized systems in Oklahoma
System Overview
Sentinel Public Water System (EPA ID: OK3007505) is a community water system in Oklahoma that serves approximately 859 people from groundwater sources.
This system serves ZIP code 73664 in Sentinel.
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
- 73664 — Sentinel
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Sentinel Public Water System (OK3007505) on EPA.gov.
Frequently Asked Questions
Is Sentinel Public Water System water safe to drink?
Based on EPA records, Sentinel Public Water System has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Sentinel Public Water System serve?
Sentinel Public Water System serves approximately 859 people across 1 ZIP code in Oklahoma.
Where does Sentinel Public Water System get its water?
The primary water source is groundwater.
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.