Data-driven insights for local properties

📊 Environmental Assessment Report

This comprehensive report analyzes both flood risk and industrial pollution exposure for this property. The assessment combines multiple data sources including USGS elevation, FEMA flood zones, historical storm modeling, and EPA Toxic Release Inventory records.

🌊 Part 1: Flood Risk Analysis

Property Overview

This section shows the fundamental characteristics of the property, including its elevation above sea level, FEMA flood zone designation, and our calculated overall flood risk rating based on historical data and topographic analysis.

Address
3218 GILLESPIE ST HOUSTON 77020
Building Size
2,364 sqft
Total structure area from HCAD building records.
Elevation
43.69 ft
Height above sea level from USGS data.
FEMA Flood Zone
X
Moderate to Low Risk - Outside 500-year floodplain
Overall Risk
Very Low
Risk based on FEMA zone and simulation.

Risk Assessment Outputs

These detailed metrics show the technical outputs from our flood risk model. They include predicted water depths at the property during a 5000-year flood event and estimated flood damage based on USACE methodology.

Risk Rating
Very Low
Flood Depth
0 ft ±0.5 ft
No flooding at current water level.
Water Surface Elevation (WSE)
N/A
Water surface elevation data not available.
Area Inundated
N/A
Data not available
Nearest Bayou Stage
N/A
No nearby bayou within monitoring range
Depth-Damage Estimate (HCAD Valuation)
$0
Property not flooded at current water level. No damage to calculate.
Depth-Damage Estimate (Neighborhood Comparison)
$0
Property not flooded at current water level. No damage to calculate.
Analysis Method
COG Bathtub Model
Raster-based flood inundation query

Flood Simulation

This simulation shows whether the property would flood based on a 5000-year flood event with 3m (9.84ft) water level. Use the interactive tool to explore different scenarios.

✅ Property Would Be Safe
Safety Margin: 33.69 feet
Severity: Safe

Adjust Flood Simulation

The analysis above uses default settings (5000-year flood, 3m/9.84ft water level). To explore different flood scenarios with interactive maps, return to the main tool:

Open Interactive Analysis Tool

Flood Risk Recommendations

Based on the property's flood risk profile, here are specific action items to consider.

  • FEMA Zone X (minimal hazard) - flood insurance available at preferred rates.
  • Review the interactive flood simulator to understand how different rainfall events could affect this property.
  • Contact Harris County Flood Control District (HCFCD) for drainage projects and flood information.

🏭 Part 2: Industrial Pollution Exposure

Property Pollution Ranking
Moderate
Higher pollution than 73% of Houston homes
This ranking compares pollution levels within 2 miles of this property against 10,000 randomly sampled Houston metro properties. Lower percentiles indicate higher pollution exposure.
Industrial Pollution Nearby (Last 10 Years)
330 thousand lbs
Very High
50.5x more than typical Houston property
≈ 16 dump trucks of chemicals within 2 miles
Total chemical releases from all industrial facilities within a 2-mile radius over the past decade (2014–2024). Data from EPA's Toxic Release Inventory tracking air, water, and land discharges.
💨 Air Pollution (Last 10 Years)
329 thousand lbs
Very High
68.3x more than typical Houston property
Chemicals released into the air from nearby facilities over 10 years. Includes both fugitive emissions (leaks, evaporation) and stack emissions (smokestacks, vents). May affect local air quality.
💧 Water Pollution (Last 10 Years)
56 lbs
Above Typical
Most Houston properties have none nearby
Chemical discharges to surface water (bayous, streams, drainage) from industrial facilities within 2 miles over the past decade. May impact local waterways and drainage systems.

❤️ Why It Matters

High chemical activity nearby can indicate industrial zones, truck traffic, or potential odor and noise issues. These factors may affect air quality, long-term property desirability, and neighborhood character. This data helps you understand the industrial footprint around your property.

🏙️ Houston Metro Benchmarks

Comparison with typical Houston properties (based on 10,000 randomly sampled homes). All measurements are for chemicals released within a 2-mile radius.

PeriodTotalAirWater
Typical Houston Property (2014-2024)6,524 lbs4,822 lbs0 lbs
This Property (2014-2024)329,527 lbs329,471 lbs56 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)58,823 lbs35,038 lbs0 lbs

📊 How This Property Compares to Houston Metro

Based on a random sample of 10,000 Houston properties, this chart shows the distribution of pollution levels across the metro area. The highlighted bar indicates where this property falls compared to other homes. Lower percentiles mean higher pollution exposure.

0-9thMost Polluted
9.9%
10-19th
10.1%
20-29th
9.9%
30-39th
10.1%
40-49th
9.7%
50-59th
10.2%
60-69th
6%
70-79th
5.8%
80-89th
4.3%
90-100thLowest Pollution
34.2%
Higher pollution than 73% of Houston homes
Each bar's width represents the percentage of Houston homes in that pollution range. This property ranks in the 20-29th percentile (top 25% most polluted).

Top chemicals released near this property (past 10 years):

n-Hexane, Styrene, Nitric acid, N-Methyl-2-pyrrolidone, Ammonia

View the full list of 25 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (25 chemicals)

#ChemicalCAS#Air (lbs, 10yr)Water (lbs, 10yr)Total (lbs, 10yr)
1n-Hexane110-54-3125,432 lbs0 lbs125,432 lbs
2Styrene100-42-572,717 lbs0 lbs72,717 lbs
3Nitric acid7697-37-235,509 lbs0 lbs35,509 lbs
4N-Methyl-2-pyrrolidone872-50-431,840 lbs0 lbs31,840 lbs
5Ammonia7664-41-725,000 lbs0 lbs25,000 lbs
6Toluene108-88-323,715 lbs0 lbs23,715 lbs
71,2,4-Trimethylbenzene95-63-68,648 lbs0 lbs8,648 lbs
8Cyclohexane110-82-72,389 lbs0 lbs2,389 lbs
9Xylene (mixed isomers)1330-20-71,434 lbs0 lbs1,434 lbs
10Copper7440-50-81,277 lbs0 lbs1,277 lbs
11Ethylene glycol107-21-1856 lbs0 lbs856 lbs
12Zinc compoundsN982154 lbs0 lbs154 lbs
13Lead compoundsN42096 lbs54 lbs150 lbs
14Cadmium compoundsN078106 lbs0 lbs106 lbs
15Chromium compounds (except for chromite ore mined in the Transvaal Region)N09084 lbs0 lbs84 lbs
16Cadmium And Cadmium CompoundsN07870 lbs0 lbs70 lbs
17Cyanide compoundsN10650 lbs0 lbs50 lbs
18Nitrate compounds (water dissociable; reportable only when in aqueous solution)N51125 lbs0 lbs25 lbs
19Chromium7440-47-316 lbs0 lbs20 lbs
20Nickel7440-02-020 lbs0 lbs20 lbs
21Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)N09019 lbs0 lbs19 lbs
22Nickel compoundsN49513 lbs0 lbs13 lbs
23Cobalt7440-48-40 lbs0 lbs4 lbs
24Manganese7439-96-50 lbs2 lbs2 lbs
25Lead And Lead CompoundsN4201 lbs0 lbs1 lbs

Top chemicals released near this property (2024 only):

n-Hexane, Toluene, Nitric acid, Styrene, Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)

View the full list of 16 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (16 chemicals)

#ChemicalCAS#Air (lbs/yr)Water (lbs/yr)Total (lbs/yr)
1n-Hexane110-54-312,290 lbs0 lbs12,290 lbs
2Toluene108-88-311,886 lbs0 lbs11,886 lbs
3Nitric acid7697-37-2755 lbs0 lbs9,446 lbs
4Styrene100-42-57,400 lbs0 lbs7,400 lbs
5Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)N0906 lbs0 lbs6,071 lbs
6Nitrate compounds (water dissociable; reportable only when in aqueous solution)N5115 lbs0 lbs3,795 lbs
7Cadmium And Cadmium CompoundsN07810 lbs0 lbs1,927 lbs
8Xylene (mixed isomers)1330-20-71,434 lbs0 lbs1,434 lbs
9Zinc compoundsN98214 lbs0 lbs1,335 lbs
101,2,4-Trimethylbenzene95-63-61,210 lbs0 lbs1,210 lbs
11Lead And Lead CompoundsN4200 lbs0 lbs990 lbs
12Chromium compounds (except for chromite ore mined in the Transvaal Region)N0901 lbs0 lbs902 lbs
13Cyanide compoundsN1065 lbs0 lbs46 lbs
14Lead7439-92-10 lbs0 lbs45 lbs
15Copper7440-50-822 lbs0 lbs44 lbs
16Lead compoundsN4200 lbs0 lbs1 lbs

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