Little Walnut Water Treatment Facility
EPA ID: OH2303212 · 1,428 people served · 1 ZIP code
Across every monitored period in the past five years, Little Walnut Water Treatment Facility reported no EPA violations for its service population of 1,428.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Little Walnut Water Treatment Facility Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Little Walnut Water Treatment Facility serves a community with a median household income of $68,242 and an estimated 62,450 residents across its service area. Approximately 71% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 32% 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?
Little Walnut Water Treatment Facility'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 Fairfield County, Ohio 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
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 6 detections recorded. 1 exceeds federal EPA limits (4 ppt for PFOA/PFOS).
Comparable Water Systems
Similar-sized systems in Ohio
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
Little Walnut Water Treatment Facility (EPA ID: OH2303212) is a community water system in Ohio that serves approximately 1,428 people from groundwater sources.
This system serves ZIP code 43130 in Lancaster.
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
- 43130 — Lancaster
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Little Walnut Water Treatment Facility (OH2303212) on EPA.gov.
Frequently Asked Questions
Is Little Walnut Water Treatment Facility water safe to drink?
Based on EPA records, Little Walnut Water Treatment Facility has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Little Walnut Water Treatment Facility serve?
Little Walnut Water Treatment Facility serves approximately 1,428 people across 1 ZIP code in Ohio.
Where does Little Walnut Water Treatment Facility 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:
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.