Grandfield
EPA ID: OK2007103 · 1,110 people served · 1 ZIP code
Federal monitoring records confirm Grandfield has operated without any EPA violations for the full five-year window — covering every contaminant category and reporting cycle across a service area of approximately 1,110 residents, with no gaps in the compliance record.
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 3 (2023) to 6 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Grandfield Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Grandfield serves a community with a median household income of $37,813 and an estimated 1,159 residents across its service area. Approximately 72% 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?
Grandfield'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.
About 5% of homes in Tillman 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
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
Grandfield (EPA ID: OK2007103) is a community water system in Oklahoma that serves approximately 1,110 people from surface water sources.
This system serves ZIP code 73546 in Grandfield.
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
- 73546 — Grandfield
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Grandfield (OK2007103) on EPA.gov.
Frequently Asked Questions
Is Grandfield water safe to drink?
Based on EPA records, Grandfield has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Grandfield serve?
Grandfield serves approximately 1,110 people across 1 ZIP code in Oklahoma.
Where does Grandfield get its water?
The primary water source is surface water.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
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.