Climate Resilience & Sustainability in St. Louis, Missouri

Climate Snapshot

St. Louis, Missouri sits at the confluence of the Mississippi and Missouri Rivers, with a city population of approximately 293,000 and a metro area of 2.8 million. The city's river-bottom geography, combined with its position at the boundary of humid subtropical and humid continental climate zones, exposes it to virtually every category of climate hazard—flooding, extreme heat, severe storms, and ice events. St. Louis experiences some of the most dramatic temperature swings of any major U.S. city, with summer highs regularly exceeding 100°F and winter lows dropping below 0°F.

The July 2022 flash flood event was historic. Over 9 inches of rain fell on the St. Louis metro in under 12 hours, making it the wettest day ever recorded in the city. The event killed 2 people, flooded 6,000 homes, and caused an estimated $250 million in damages. I-70, I-64, and I-44 were all impassable simultaneously. The event demonstrated that St. Louis's flood risk extends far beyond the Mississippi River floodplain—urban creeks, tributaries, and overwhelmed storm sewers create distributed flood risk across the entire metro.

St. Louis recorded its hottest summer on record in 2023, with 62 days above 90°F and 18 days above 100°F. The city's heat island is intense—a 2022 Washington University study documented temperature differentials of up to 16°F between north St. Louis neighborhoods and suburban areas with mature tree canopy. North St. Louis, the city's poorest and most predominantly Black area, consistently records the highest temperatures.

Top Climate Risks

Extreme Heat

St. Louis is one of the hottest major cities in the Midwest, and heat is its deadliest climate risk. The July 1995 heat wave killed 476 people in the metro area—a death toll rivaling Hurricane Katrina. St. Louis recorded 18 days above 100°F in 2023, and wet-bulb temperatures exceeded dangerous thresholds on 15 days. North St. Louis neighborhoods experience extreme heat exposure compounded by poverty, vacancy (30% of parcels are vacant), and the lowest tree canopy in the metro at 12%. Heat-related hospitalizations in the city increased 75% between 2015 and 2023.

Flash Flooding

The July 2022 event highlighted St. Louis's vulnerability to flash flooding beyond its major rivers. The city's topography—hills funneling into narrow creek valleys—concentrates runoff rapidly. The River Des Peres, Deer Creek, and Maline Creek flood repeatedly during heavy rain. The Metropolitan St. Louis Sewer District (MSD) estimates 15,000 structures in the metro area face repetitive flood risk. MSD's Project Clear, the city's EPA consent decree compliance program, requires $4.7 billion in sewer infrastructure improvements through 2039.

Severe Storms and Tornadoes

St. Louis sits at the intersection of warm Gulf air and cold northern systems, creating prolific severe weather. The May 2011 EF-4 Joplin tornado—160 miles away—drew attention to the region's tornado risk, and St. Louis itself was struck by an EF-2 tornado in April 2011 that damaged Lambert International Airport. The December 2021 tornado outbreak tracked an EF-3 tornado through the Defiance-Edwardsville corridor in the metro's Illinois suburbs, killing 6 people. Derecho and severe thunderstorm frequency has increased 20% in the 2014-2024 decade.

Local Climate Action

The City of St. Louis adopted its Climate Action & Adaptation Plan in 2017, updated in 2023, targeting a 50% reduction in community emissions by 2035 and carbon neutrality by 2050 from a 2005 baseline. The plan was developed through the St. Louis Climate Equity Initiative, which centered environmental justice in planning.

MSD's Project Clear is the dominant infrastructure program, investing $4.7 billion over 25 years to address combined sewer overflows and reduce flood risk. The program includes $500 million in green infrastructure commitments. MSD's Rainscaping Program provides incentives for residential rain gardens ($1,500 grants) and rain barrel installations.

St. Louis's Building Energy Improvement Board (BEIB), established in 2020, administers the city's commercial building benchmarking ordinance requiring energy disclosure for buildings over 50,000 square feet. The city achieved 100% renewable electricity for municipal operations in 2022 through an Ameren Missouri green tariff. Sustainability efforts are coordinated through the city's Office of Sustainability, which manages the $2 million annual Equitable Climate Fund directing resources to frontline communities.

Regulations & Incentives

Missouri has no statewide climate plan or clean energy standard, placing the burden on local governments. However, Ameren Missouri's Integrated Resource Plan (2023) calls for retiring all coal plants by 2035 and deploying 5,400 MW of renewables. Ameren offers net metering, a community solar program, and rebates for insulation, HVAC, and smart thermostats through its Pure Power program.

MSD's impervious surface fee credit provides up to 50% reduction for green infrastructure installations. St. Louis's PACE program enables commercial property owners to finance clean energy improvements through property assessments. The St. Louis Development Corporation provides tax increment financing (TIF) support for projects incorporating significant sustainability features.

Missouri's Property Tax Exemption for Solar and Wind Energy Systems exempts 100% of the added assessed value from property taxes for 25 years. The state's low-income weatherization program serves approximately 4,000 households annually.

Federal Funding Opportunities

Missouri's IRA Home Energy Rebate allocation totals $127 million. St. Louis residents can access up to $8,000 for heat pumps and $14,000 for income-qualified households. Federal 30% tax credits for solar, batteries, and efficiency improvements run through 2032.

FEMA BRIC awarded $18 million to the St. Louis metro in 2023 for flood mitigation, including $12 million specifically for River Des Peres corridor improvements. FEMA's Flood Mitigation Assistance program has funded $25 million in repetitive-loss property buyouts in the metro since 2020.

The EPA's consent decree with MSD leverages federal water infrastructure funding, including the Bipartisan Infrastructure Law's $55 billion allocation. Missouri has received $800 million in State Revolving Fund allocations since 2022. DOE Weatherization allocated $22 million to Missouri in 2023. HUD's CDBG program provides the City of St. Louis approximately $12 million annually, supporting flood recovery and resilient housing.

How Council Fire Can Help

Council Fire's expertise in water infrastructure, environmental justice, and community resilience directly addresses St. Louis's interconnected challenges. Our team can support MSD's Project Clear with green infrastructure design optimization, watershed-scale planning, and community engagement strategies that build neighborhood ownership of stormwater assets in the communities that need them most.

For St. Louis's extreme heat crisis, Council Fire provides urban heat island mitigation planning, cool corridor design, and tree canopy equity strategies focused on north St. Louis's highest-temperature neighborhoods. Our building decarbonization and energy efficiency work supports the BEIB's benchmarking program and helps building owners develop compliance pathways.

Council Fire's environmental justice expertise ensures that climate investments flow to the neighborhoods bearing the greatest burden—addressing the 16°F temperature disparity between north St. Louis and suburban areas while building community capacity and local economic opportunity.

Frequently Asked Questions

What are the biggest climate risks facing St. Louis?

St. Louis faces extreme heat (62 days above 90°F and 18 above 100°F in 2023, with the 1995 heat wave killing 476 people), flash flooding (the July 2022 event caused $250 million in damages with 9 inches of rain), and severe storms including tornadoes. North St. Louis experiences temperatures up to 16°F higher than suburban areas, making heat the city's deadliest climate risk.

Does St. Louis have a climate action plan?

Yes. St. Louis's Climate Action & Adaptation Plan (updated 2023) targets 50% emissions reduction by 2035 and carbon neutrality by 2050. Key programs include MSD's $4.7 billion Project Clear (sewer infrastructure and green infrastructure), commercial building energy benchmarking, 100% renewable electricity for city operations (achieved 2022), and the $2 million annual Equitable Climate Fund for frontline communities.

What federal funding is available for climate resilience in Missouri?

Missouri communities can access $127 million in IRA Home Energy Rebates, FEMA BRIC grants ($18 million to St. Louis metro in 2023), FEMA Flood Mitigation Assistance ($25 million for buyouts since 2020), Bipartisan Infrastructure Law water funding, DOE Weatherization ($22 million for Missouri in 2023), and HUD CDBG ($12 million annually for St. Louis). Federal 30% tax credits for solar and batteries run through 2032.

How does environmental justice relate to climate risk in St. Louis?

St. Louis's climate risks map directly onto racial and economic geography. North St. Louis—predominantly Black, with 30% vacant parcels and 12% tree canopy—records temperatures 16°F higher than suburban areas. The July 2022 flood disproportionately damaged low-income south city neighborhoods. The city's Climate Equity Initiative and $2 million Equitable Climate Fund direct resources to these frontline communities.