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South Dakota · EPA ECHO (national)
Willow Lake, City of SSCS
Permit SDG821679
—
No waterway impact reported
Reported events
3
Total volume
2.2M gal
Reached waterways
0 (0%)
Reporting since
2025
What caused the overflows
Rainfall / Flooding
3
Reported overflow events (showing 3 of 3)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Apr 27, 2026 | 470K gal | Rainfall / Flooding | — | Mud Lake |
| Sep 18, 2025 | 1.7M gal | Rainfall / Flooding | — | Mud Lake |
| May 16, 2025 | — | Rainfall / Flooding | — | Mud Lake |
Source: EPA ECHO (national). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.