Potosi Waterworks
EPA ID: WI1220117 · 718 people served · 1 ZIP code
Unlike many utilities its size, Potosi Waterworks carries a violation-free five-year record — no EPA notices, no MCL exceedances, serving 718 people.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Potosi Waterworks Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Potosi Waterworks serves a community with a median household income of $73,750 and an estimated 2,472 residents across its service area. Approximately 67% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Potosi Waterworks'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 2% of homes in Grant County, Wisconsin 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 Wisconsin
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
Potosi Waterworks (EPA ID: WI1220117) is a community water system in Wisconsin that serves approximately 718 people from groundwater sources.
This system serves ZIP code 53820 in Potosi.
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
- 53820 — Potosi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Potosi Waterworks (WI1220117) on EPA.gov.
Frequently Asked Questions
Is Potosi Waterworks water safe to drink?
Based on EPA records, Potosi Waterworks has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Potosi Waterworks serve?
Potosi Waterworks serves approximately 718 people across 1 ZIP code in Wisconsin.
Where does Potosi Waterworks 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.