Jefferson
EPA ID: SD4600060 · 475 people served · 1 ZIP code
EPA monitoring data for Jefferson shows an unblemished five-year compliance history — no violations of any kind have been recorded for this utility, which supplies water to approximately 475 people, covering every reporting cycle without a single MCL exceedance or monitoring lapse.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Jefferson Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Jefferson serves a community with a median household income of $86,895 and an estimated 1,713 residents across its service area. Approximately 60% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Jefferson'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 Union County, South Dakota 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 South Dakota
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
Jefferson (EPA ID: SD4600060) is a community water system in South Dakota that serves approximately 475 people from groundwater sources.
This system serves ZIP code 57038 in Jefferson.
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
- 57038 — Jefferson
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Jefferson (SD4600060) on EPA.gov.
Frequently Asked Questions
Is Jefferson water safe to drink?
Based on EPA records, Jefferson has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Jefferson serve?
Jefferson serves approximately 475 people across 1 ZIP code in South Dakota.
Where does Jefferson 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.