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Water Supply — NPDES discharge permits in South Dakota

Of the 4 permits in EPA's SIC 4941 in SD, 1 went over a limit between 2025-10-01 and 2026-09-30 (Conductivity: 1). 1 is past the expiry date EPA's file holds; 1 has a renewal application overdue or due within 18 months. EPA's file of 2026-10-15.

FacilityLast 12 monthsPermit
Brandon WTP
SD0028654 · Water Supply
Over a limit 1×: Conductivity (1×)Expires Oct 31, 2029
Clay Rural Water System - Wynstone
SD0028011 · Water Supply
No value over a limitRenewal application overdue
Springfield WTP
SD0028647 · Water Supply
No value over a limit; 96 required values not reportedExpires Sep 30, 2029
Yankton, City of Water Purification Facility
SD0028628 · Water Supply
No value over a limitPermit past the expiry date EPA's file holds

The record is EPA's ICIS-NPDES file of 2026-10-15: values filed against each limit between Oct 1, 2025 and Sep 30, 2026. No reports on file may be EPA's gap, not the facility's.

For programs and AI agents: this screen as JSON at /api/v1/permits?state=SD&sic=4941, narrowed with &over_limit=true, &parameter=phosphorus or &renewal=due; or add https://passage-data.com/mcp as a remote MCP server (tool list_permits). Free, no key. llms.txt

From EPA's ECHO data, not the permit document itself: your permit is the final word. All states