States › Arizona › Maricopa County › Flood
Flood in Maricopa County, Arizona
661 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 661 flood events in Maricopa County, Arizona, between 1950 and 2026, spread over 28 years.
August is the busiest month, with 227 of the recorded events. The last 20 years account for 603 events against 58 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 17% of the 3,896 flood events recorded in Arizona; its 7.2 per 100 square miles compares with 3.4 statewide.
NCEI attributes 19 deaths in the county to floods and flash floods.
Compared with Arizona
| Measure | Maricopa County | Arizona | US |
|---|---|---|---|
| Flood events since 1950 | 661 | 3,896 | 183,559 |
| Per 100 square miles | 7.2 | 3.4 | 5.2 |
| Per 10,000 residents | 1.5 | 5.4 | 5.5 |
| Deaths recorded | 19 | 127 | 2,961 |
| Busiest month | August | August | June |
By year
Seasonality
10Feb
6Mar
40Apr
7May
4Jun
6Jul
129Aug
227Sep
103Oct
87Nov
38Dec
4
Recorded events
The 193 events kept for this page are the 120 most recent plus the 80 with the most damage, deaths or injuries out of 661. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 19 Nov 2025 | Flash Flood | — | $20K | — | — | — | County |
| 19 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 19 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 19 Nov 2025 | Flash Flood | — | $30K | — | — | — | County |
| 19 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | $20K | — | — | — | County |
| 18 Nov 2025 | Flood | — | — | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | $30K | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | $20K | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | — | — | — | — | County |
| 18 Nov 2025 | Flash Flood | — | $20K | — | — | — | County |
| 13 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 13 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 13 Oct 2025 | Flood | — | — | — | — | — | County |
| 13 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $20K | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $50K | — | 1 | — | County |
| 12 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $20K | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $20K | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $20K | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $20K | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $20K | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | — | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $500K | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $50K | — | — | — | County |
| 12 Oct 2025 | Flash Flood | — | $20K | — | — | — | County |
| 27 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 27 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 27 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 27 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 27 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 27 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $60K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | — | — | — | — | County |
| 26 Sep 2025 | Flash Flood | — | $200K | — | 1 | — | County |
| 19 Sep 2025 | Flash Flood | — | $20K | — | — | — | County |
| 4 Sep 2025 | Flood | — | — | — | — | — | County |
| 3 Sep 2025 | Flash Flood | — | $10K | — | — | — | County |
| 26 Aug 2025 | Flood | — | — | — | — | — | County |
| 25 Aug 2025 | Flood | — | — | — | — | — | County |
| 15 Aug 2025 | Flash Flood | — | — | — | — | — | County |
| 15 Aug 2025 | Flash Flood | — | — | — | — | — | County |
| 14 Aug 2025 | Flash Flood | — | — | — | — | — | County |
| 14 Aug 2025 | Flash Flood | — | — | — | — | — | County |
| 14 Aug 2025 | Flash Flood | — | — | — | — | — | County |
| 2 Jun 2025 | Flash Flood | — | $500 | — | — | — | County |
| 4 May 2025 | Flash Flood | — | — | — | — | — | County |
| 4 May 2025 | Flash Flood | — | — | — | — | — | County |
| 22 Aug 2024 | Flood | — | $5K | — | — | — | County |
| 7 Aug 2024 | Flash Flood | — | — | — | — | — | County |
| 3 Aug 2024 | Flash Flood | — | — | — | — | — | County |
| 25 Jul 2024 | Flash Flood | — | — | — | — | — | County |
| 25 Jul 2024 | Flash Flood | — | — | — | — | — | County |
| 25 Jul 2024 | Flash Flood | — | — | — | — | — | County |
| 16 Jul 2024 | Flash Flood | — | — | — | — | — | County |
| 1 Apr 2024 | Flood | — | — | — | — | — | County |
| 23 Jan 2024 | Flood | — | — | — | — | — | County |
| 13 Sep 2023 | Flash Flood | — | $1K | — | — | — | County |
| 31 Aug 2023 | Flash Flood | — | $30K | — | — | — | County |
| 31 Aug 2023 | Flash Flood | — | — | — | — | — | County |
| 31 Aug 2023 | Flash Flood | — | — | — | — | — | County |
| 31 Aug 2023 | Flash Flood | — | — | — | — | — | County |
| 31 Aug 2023 | Flash Flood | — | — | — | — | — | County |
| 19 May 2023 | Flash Flood | — | — | — | — | — | County |
| 1 May 2023 | Flood | — | — | — | — | — | County |
| 1 Apr 2023 | Flood | — | — | — | — | — | County |
| 1 Apr 2023 | Flood | — | — | — | — | — | County |
| 1 Apr 2023 | Flood | — | — | — | — | — | County |
| 1 Apr 2023 | Flood | — | — | — | 2 | — | County |
| 1 Apr 2023 | Flood | — | — | — | — | — | County |
| 1 Apr 2023 | Flood | — | $30K | — | — | — | County |
| 23 Mar 2023 | Flood | — | — | — | — | — | County |
| 22 Mar 2023 | Flood | — | — | — | — | — | County |
| 22 Mar 2023 | Flood | — | — | — | — | — | County |
| 22 Mar 2023 | Flood | — | — | — | — | — | County |
| 22 Mar 2023 | Flood | — | — | — | — | — | County |
| 22 Mar 2023 | Flood | — | — | — | — | — | County |
| 22 Mar 2023 | Flood | — | $40K | — | — | — | County |
| 16 Mar 2023 | Flood | — | — | — | — | — | County |
| 16 Mar 2023 | Flood | — | — | — | — | — | County |
| 16 Mar 2023 | Flood | — | — | — | — | — | County |
| 16 Mar 2023 | Flood | — | — | — | — | — | County |
| 15 Mar 2023 | Flash Flood | — | — | — | — | — | County |
| 15 Mar 2023 | Flash Flood | — | — | — | — | — | County |
| 15 Mar 2023 | Flash Flood | — | — | — | — | — | County |
| 11 Mar 2023 | Flash Flood | — | — | — | — | — | County |
| 4 Mar 2023 | Flood | — | — | — | — | — | County |
| 4 Mar 2023 | Flood | — | — | — | — | — | County |
| 4 Mar 2023 | Flood | — | — | — | 1 | — | County |
| 4 Mar 2023 | Flood | — | $50K | — | — | — | County |
| 4 Mar 2023 | Flood | — | — | — | — | — | County |
| 4 Mar 2023 | Flood | — | — | — | — | — | County |
| 4 Mar 2023 | Flood | — | — | — | — | — | County |
| 4 Mar 2023 | Flood | — | — | — | — | — | County |
| 30 Jul 2022 | Flash Flood | — | $100K | — | — | — | County |
| 30 Jul 2022 | Flash Flood | — | $90K | — | — | — | County |
| 18 Aug 2021 | Flash Flood | — | $20K | — | 2 | — | County |
| 14 Aug 2021 | Flash Flood | — | $25M | — | 2 | — | County |
| 13 Aug 2021 | Flash Flood | — | $70K | — | — | — | County |
| 13 Aug 2021 | Flash Flood | — | $35K | — | — | — | County |
| 25 Jul 2021 | Flash Flood | — | $60K | — | — | — | County |
| 25 Jul 2021 | Flash Flood | — | $50K | — | — | — | County |
| 25 Jul 2021 | Flash Flood | — | $50K | — | — | — | County |
| 25 Jul 2021 | Flash Flood | — | $40K | — | — | — | County |
| 23 Jul 2021 | Flash Flood | — | $100K | — | — | — | County |
| 23 Jul 2021 | Flash Flood | — | $40K | — | — | — | County |
| 30 Aug 2020 | Flash Flood | — | $30K | — | — | — | County |
| 29 Aug 2020 | Flash Flood | — | $40K | — | — | — | County |
| 22 Aug 2020 | Flash Flood | — | $10K | — | 2 | 3 | County |
| 13 Mar 2020 | Flash Flood | — | $30K | — | — | — | County |
| 29 Nov 2019 | Flash Flood | — | $30K | — | — | — | County |
| 20 Nov 2019 | Flash Flood | — | $30K | — | — | — | County |
| 26 Sep 2019 | Flash Flood | — | $30K | — | — | — | County |
| 23 Sep 2019 | Flash Flood | — | $40K | — | — | — | County |
| 23 Oct 2018 | Flash Flood | — | $40K | — | — | — | County |
| 13 Oct 2018 | Flash Flood | — | $50K | — | — | — | County |
| 2 Oct 2018 | Flash Flood | — | $50K | — | — | — | County |
| 2 Oct 2018 | Flash Flood | — | $40K | — | — | — | County |
| 11 Aug 2018 | Flash Flood | — | $50K | — | — | — | County |
| 2 Aug 2016 | Flash Flood | — | $50K | — | — | — | County |
| 30 Jul 2016 | Flood | — | $50K | — | — | — | County |
| 27 Sep 2014 | Flood | — | $50K | — | — | — | County |
| 8 Sep 2014 | Flood | — | $5.0M | — | — | — | County |
| 8 Sep 2014 | Flash Flood | — | $1.0M | — | — | — | County |
| 8 Sep 2014 | Flash Flood | — | $500K | — | — | — | County |
| 8 Sep 2014 | Flash Flood | — | $500K | — | — | — | County |
| 8 Sep 2014 | Flash Flood | — | $250K | — | — | — | County |
| 25 Aug 2014 | Flash Flood | — | $300K | — | — | — | County |
| 19 Aug 2014 | Flash Flood | — | $2.0M | — | — | — | County |
| 19 Aug 2014 | Flash Flood | — | $1.0M | — | — | — | County |
| 12 Aug 2014 | Flood | — | $2.0M | — | — | — | County |
| 12 Aug 2014 | Flash Flood | — | $100K | — | — | — | County |
| 21 Jul 2013 | Flash Flood | — | $100K | — | — | — | County |
| 8 Mar 2013 | Flood | — | — | — | 1 | — | County |
| 7 Sep 2012 | Flash Flood | — | $300K | — | — | — | County |
| 7 Sep 2012 | Flash Flood | — | $80K | — | — | — | County |
| 7 Sep 2012 | Flash Flood | — | $30K | — | — | — | County |
| 7 Sep 2012 | Flash Flood | — | $30K | — | — | — | County |
| 23 Aug 2012 | Flash Flood | — | $40K | — | — | — | County |
| 23 Aug 2012 | Flash Flood | — | $40K | — | — | — | County |
| 23 Aug 2012 | Flash Flood | — | $30K | — | — | — | County |
| 16 Aug 2012 | Flash Flood | — | $500K | — | — | — | County |
| 31 Jul 2012 | Flash Flood | — | $10M | — | — | 1 | County |
| 31 Jul 2012 | Flash Flood | — | $50K | — | — | — | County |
| 14 Jul 2012 | Flash Flood | — | — | — | 1 | — | County |
| 21 Jan 2010 | Flood | — | $2.0M | — | — | — | County |
| 21 Jan 2010 | Flood | — | $100K | — | — | — | County |
| 13 Jul 2008 | Flash Flood | — | $400K | — | — | — | County |
| 10 Jul 2008 | Flash Flood | — | $200K | — | — | — | County |
| 31 Jul 2007 | Flash Flood | — | $2.0M | — | — | — | County |
| 30 Jul 2007 | Flash Flood | — | $150K | — | — | — | County |
| 26 Jul 2007 | Flash Flood | — | $5K | — | — | 1 | County |
| 25 Jul 2007 | Flash Flood | — | $100K | — | — | — | County |
| 23 Jul 2007 | Flash Flood | — | $200K | — | — | — | County |
| 9 Sep 2006 | Flash Flood | — | $100K | — | — | — | County |
| 9 Aug 2005 | Flash Flood | — | $300K | — | 2 | — | County |
| 9 Aug 2005 | Flash Flood | — | $50K | — | — | — | County |
| 2 Aug 2005 | Flash Flood | — | $1.0M | — | — | — | County |
| 30 Jul 2005 | Flash Flood | — | $3.0M | — | — | — | County |
| 4 Sep 2003 | Flash Flood | — | — | — | — | 2 | County |
| 28 Aug 2003 | Flash Flood | — | $50K | — | — | — | County |
| 13 Aug 2003 | Flash Flood | — | — | — | 1 | — | County |
| 27 Oct 2000 | Flash Flood | — | $2.0M | $1.0M | — | — | County |
| 21 Oct 2000 | Flash Flood | — | $2.0M | $1.0M | — | — | County |
| 14 Jul 1999 | Flood | — | $80K | — | — | — | County |
| 28 Mar 1998 | Flash Flood | — | — | — | 3 | — | County |
Questions and answers
How many flood events has Maricopa County had?
661 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Maricopa County?
19 Nov 2025 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Maricopa County?
The flash flood of 14 Aug 2021, with property damage estimated by NCEI at $25M; 2 deaths recorded.
How does Maricopa County compare with Arizona for flood?
7.2 events per 100 square miles against 3.4 statewide; the county holds 661 of the state's 3,896 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.