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South Dakota · EPA ECHO (national)
Sioux Falls, City of SSCS
Permit SD0022128
—
No waterway impact reported
Reported events
16
Total volume
3.0M gal
Reached waterways
0 (0%)
Reporting since
2023
What caused the overflows
Other / Unknown
9
Equipment Failure
6
Rainfall / Flooding
1
Reported overflow events (showing 16 of 16)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| May 30, 2026 | 2.7M gal | Equipment Failure | — | Big Sioux River |
| Aug 12, 2025 | 120K gal | Other / Unknown | — | Big Sioux River |
| Jun 25, 2025 | 100 gal | Other / Unknown | — | — |
| Feb 27, 2025 | 6K gal | Other / Unknown | — | — |
| Oct 14, 2024 | 5K gal | Other / Unknown | — | — |
| Aug 30, 2024 | 17 gal | Equipment Failure | — | Big Sioux River |
| Aug 28, 2024 | 10 gal | Other / Unknown | — | — |
| Aug 25, 2024 | 20K gal | Equipment Failure | — | — |
| Jul 31, 2024 | 1K gal | Equipment Failure | — | — |
| Jun 22, 2024 | — | Rainfall / Flooding | — | Big Sioux River |
| Apr 4, 2024 | 500 gal | Other / Unknown | — | — |
| Mar 26, 2024 | 5K gal | Other / Unknown | — | — |
| Feb 28, 2024 | 500 gal | Equipment Failure | — | — |
| Jul 26, 2023 | 54K gal | Equipment Failure | — | — |
| Jul 17, 2023 | 50 gal | Other / Unknown | — | — |
| Jul 5, 2023 | 3K gal | Other / Unknown | — | — |
Source: EPA ECHO (national). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.