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California · California (CIWQS)
Claremont City
F
Usually reaches water
Reported events
37
Total volume
57K gal
Reached waterways
23 (62%)
Reporting since
2008
What caused the overflows
Equipment Failure
28
Root Intrusion
6
Other / Unknown
2
Grease / FOG
1
Reported overflow events (showing 37 of 37)
| Date | Volume | Cause | Reached water | Receiving water |
|---|---|---|---|---|
| Jan 21, 2026 | 2K gal | Equipment Failure | — | — |
| Jul 22, 2025 | 945 gal | Grease / FOG | — | — |
| May 9, 2024 | 800 gal | Root Intrusion | Yes | Chino Creek (460) |
| Jan 12, 2024 | 3K gal | Root Intrusion | — | — |
| Oct 19, 2023 | 1K gal | Equipment Failure | — | — |
| Feb 19, 2023 | 5K gal | Equipment Failure | Yes | Paved Surface;Separate Storm Drain |
| Nov 24, 2022 | 3 gal | Equipment Failure | — | Paved Surface;Unpaved surface |
| Mar 30, 2022 | 225 gal | Equipment Failure | Yes | Paved Surface;Separate Storm Drain |
| Jan 4, 2022 | 470 gal | Equipment Failure | Yes | Building or Structure;Street/Curb and Gutter |
| Aug 4, 2021 | 250 gal | Equipment Failure | — | Paved Surface |
| Aug 3, 2021 | 9K gal | Equipment Failure | — | Building or Structure;Paved Surface |
| Apr 1, 2021 | 625 gal | Equipment Failure | Yes | Paved Surface;Separate Storm Drain;Street/Curb and Gutter;Unpaved surface |
| Jan 4, 2021 | 2K gal | Root Intrusion | Yes | Paved Surface;Separate Storm Drain;Street/Curb and Gutter |
| Dec 20, 2020 | 750 gal | Equipment Failure | Yes | Paved Surface;Separate Storm Drain |
| Mar 17, 2020 | 25 gal | Equipment Failure | — | Building or Structure;Unpaved surface |
| Feb 20, 2020 | 750 gal | Equipment Failure | Yes | Building or Structure;Separate Storm Drain;Street/Curb and Gutter |
| Jan 16, 2019 | 3K gal | Equipment Failure | Yes | Separate Storm Drain |
| Aug 4, 2017 | 825 gal | Equipment Failure | Yes | Separate Storm Drain |
| Jun 6, 2017 | 25 gal | Equipment Failure | Yes | Combined Storm Drain (Combined CS only) |
| Apr 4, 2017 | 2K gal | Equipment Failure | — | Street/Curb and Gutter |
| Feb 24, 2017 | 50 gal | Equipment Failure | — | Paved Surface |
| Feb 8, 2017 | 450 gal | Equipment Failure | — | Paved Surface;Street/Curb and Gutter |
| Jan 24, 2017 | 2K gal | Equipment Failure | Yes | Separate Storm Drain |
| Jan 13, 2017 | 2K gal | Equipment Failure | Yes | Separate Storm Drain |
| Aug 11, 2016 | 2K gal | Equipment Failure | Yes | Separate Storm Drain |
| Jul 25, 2016 | 13K gal | Equipment Failure | Yes | Separate Storm Drain |
| Jun 28, 2016 | 3 gal | Equipment Failure | — | Paved Surface |
| Feb 1, 2016 | 600 gal | Equipment Failure | Yes | Other (specify below) |
| Jan 13, 2016 | 300 gal | Root Intrusion | — | Unpaved surface |
| Dec 24, 2015 | 225 gal | Equipment Failure | Yes | Other (specify below) |
| Dec 13, 2015 | 300 gal | Equipment Failure | Yes | Other (specify below) |
| Oct 9, 2015 | 240 gal | Equipment Failure | Yes | Other (specify below) |
| Sep 11, 2015 | 10 gal | Equipment Failure | Yes | Separate Storm Drain |
| Mar 14, 2015 | 1K gal | Other / Unknown | — | Building or Structure |
| Jan 15, 2015 | 240 gal | Other / Unknown | Yes | Surface Water |
| Jan 15, 2015 | 225 gal | Root Intrusion | Yes | Other (specify below) |
| Dec 13, 2008 | 2K gal | Root Intrusion | Yes | Storm drain |
Source: California (CIWQS). Volumes are utility-reported estimates. Some events lack precise coordinates or volumes.