St. Louis County, Missouri — Property Hazard, Flood Zone, Soil, Water & EPA Guide
What Are the Flood, Soil Foundation & EPA Risks in St. Louis County, MO?
In St. Louis County, Missouri, public U.S. EPA records track 1,635 regulated facilities (#7 of 190 in Missouri), including 15 (0.9%) High-Risk sites and $318,096 in federal penalties. Countywide due diligence also covers 101 Safe Drinking Water (SDWIS) facilities, 1,651 Clean Water NPDES permits, 3 FEMA Federal Disaster Declarations (3 flood/storm), USDA Soil Foundation Shrink-Swell (MODERATE signal), and EPA Zone 1 — High Potential (> 4.0 pCi/L).
St. Louis County, MO 6-in-1 Flood, Soil Foundation, Tap Water & Radon Signals
🔒 Parcel-Level Soil LEP %, Water Table Depth & Flood Zone Require Street Address Scan📊 St. Louis County, MO Statistical Risk Graphs & Multi-Hazard Telemetry
SOURCE: EPA ECHO • USDA SSURGO • FEMA NRI • USGS (November 05, 2026)Municipalities in St. Louis County
ZIP Codes in St. Louis County
Top EPA Regulated Facilities in St. Louis County, MO
100% of High-Risk & penalized facilities have facility names, street names, and dockets redacted (3 Low-Risk compliant records shown as Free Previews).
| Facility Name / Hazard Type | Sector Location (Street Redacted) | Risk Tier & Score | Compliance Status | Enforcement / Unlock |
|---|---|---|---|---|
| 🔒 Locked High-Risk EPA Enforcement Record #1 | 🔒 Exact Street & Parcel Redacted • MARYLAND HEIGHTS, MO (ZIP 63043 Sector) | HIGH (70/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #2 | 🔒 Exact Street & Parcel Redacted • LADUE, MO (ZIP 63124 Sector) | HIGH (67/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #3 | 🔒 Exact Street & Parcel Redacted • EARTH CITY, MO (ZIP 63045 Sector) | HIGH (64/100) | Significant Violation (6 qtrs NC) | 🔒 6 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #4 | 🔒 Exact Street & Parcel Redacted • ST. LOUIS, MO (ZIP 63129 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #5 | 🔒 Exact Street & Parcel Redacted • WILDWOOD, MO (ZIP 63038 Sector) | HIGH (64/100) | Significant Violation (11 qtrs NC) | 🔒 11 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #6 | 🔒 Exact Street & Parcel Redacted • FLORISSANT, MO (ZIP 63033 Sector) | HIGH (64/100) | Significant Violation (12 qtrs NC) | 🔒 12 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #7 | 🔒 Exact Street & Parcel Redacted • WILDWOOD, MO (ZIP 63038 Sector) | HIGH (64/100) | Significant Violation (9 qtrs NC) | 🔒 9 Qtrs Non-Compliance • Unlock → |
| 🔒 Locked High-Risk EPA Enforcement Record #8 | 🔒 Exact Street & Parcel Redacted • BALLWIN, MO (ZIP 63021 Sector) | HIGH (64/100) | Significant Violation (10 qtrs NC) | 🔒 10 Qtrs Non-Compliance • Unlock → |
| LAMBERT SAINT LOUIS AIRPORT AUTHORITY FREE PREVIEW (LOW RISK) | 10701 LAMBERT INTERNATIONAL BLVD, ST. LOUIS, MO 63145 | LOW (20/100) | No Violation Identified (0 qtrs NC) | $0 |
Frequently Asked Questions — St. Louis County, Missouri Environmental Due Diligence
How many EPA-regulated environmental sites are in St. Louis County, Missouri?
Public U.S. EPA records track 1,635 regulated facilities in St. Louis County, Missouri (ranking #7 of 190 jurisdictions in MO). Of those, 15 (0.9%) are classified in the High-Risk tier due to significant enforcement or chemical release history, and 37 (2.3%) have active non-compliance quarters.
Which ZIP codes and cities in St. Louis County have the highest regulated facility density?
Within St. Louis County, the highest concentrations of EPA-tracked facilities are located in ZIP 63043 (Maryland Heights, 329 sites), ZIP 63017 (Chesterfield, 235 sites), ZIP 63119 (Webster Groves, 174 sites), spanning municipal corridors including Maryland Heights (330 sites), Eureka (167 sites), Creve Coeur (88 sites).
How many hazardous waste (RCRA) and toxic release (TRI) handlers operate in St. Louis County?
Across St. Louis County, 253 facilities (15.5% of regulated sites) are registered Resource Conservation and Recovery Act (RCRA) hazardous waste generators or handlers, and 0 industrial sites report toxic chemical releases to the EPA Toxics Release Inventory (TRI).
What is the EPA Radon Zone classification for St. Louis County, MO?
Geologic indoor air screening places St. Louis County in EPA Zone 1 — High Potential (> 4.0 pCi/L). Counties in EPA Radon Zone 1 have a predicted average indoor radon screening level greater than 4.0 pCi/L (the EPA action threshold). Short-term or continuous indoor radon testing is strongly recommended prior to closing.
How many drinking water systems (SDWIS), impaired water bodies, and FEMA flood disasters are recorded in St. Louis County, MO?
Federal records track 101 Safe Drinking Water (SDWIS) facilities, 1,651 Clean Water Act NPDES permits, and 380 impaired water dischargers in St. Louis County, alongside 3 historical FEMA federal disaster declarations (3 flood/storm events).
Does St. Louis County, MO have expansive clay soil or foundation risk?
USDA regional soil engineering screening for St. Louis County indicates a MODERATE shrink-swell risk signal and steel pipe corrosivity rated High. Run a street address scan to unlock the exact parcel soil series, LEP %, and water table depth.