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
7751 GREENDOWNS ST HOUSTON 77087
Building Size
933 sqft
Total structure area from HCAD building records.
Elevation
33.28 ft
Height above sea level from USGS data.
FEMA Flood Zone
AE
High Risk - 1% annual chance with established base flood elevation
Overall Risk
Moderate
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
Moderate
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: 23.28 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.

  • This property is in a high-risk flood zone. Flood insurance is required for mortgages.
  • Consider flood mitigation measures like elevated utilities and flood vents.
  • 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
High
Higher pollution than 87% 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)
3.44 million lbs
Extremely High
527.9x more than typical Houston property
≈ 172 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)
3.34 million lbs
Extremely High
691.9x 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)
108 thousand lbs
Extremely High
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)3,444,442 lbs3,336,436 lbs108,006 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)305,925 lbs222,688 lbs15,281 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 87% of Houston homes
Each bar's width represents the percentage of Houston homes in that pollution range. This property ranks in the 10-19th percentile (top 15% most polluted).

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

Styrene, Ammonia, 1,3-Butadiene, Methyl tert-butyl ether, Methanol

View the full list of 24 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (24 chemicals)

#ChemicalCAS#Air (lbs, 10yr)Water (lbs, 10yr)Total (lbs, 10yr)
1Styrene100-42-51,723,650 lbs7,271 lbs1,730,921 lbs
2Ammonia7664-41-7764,243 lbs29,897 lbs794,140 lbs
31,3-Butadiene106-99-0431,070 lbs1 lbs431,071 lbs
4Methyl tert-butyl ether1634-04-4267,534 lbs0 lbs267,534 lbs
5Methanol67-56-155,467 lbs39,325 lbs94,793 lbs
6N-Methyl-2-pyrrolidone872-50-437,616 lbs0 lbs37,616 lbs
7N,N-Dimethylformamide68-12-222,161 lbs88 lbs22,249 lbs
8Nitrate compounds (water dissociable; reportable only when in aqueous solution)N5110 lbs21,954 lbs21,954 lbs
9tert-Butyl alcohol75-65-015,263 lbs0 lbs15,263 lbs
10Propylene115-07-114,205 lbs0 lbs14,205 lbs
11Sodium nitrite7632-00-00 lbs9,470 lbs9,470 lbs
12Ethylene74-85-12,621 lbs0 lbs2,621 lbs
13Certain glycol ethersN2301,884 lbs0 lbs1,884 lbs
14Chromium compounds (except for chromite ore mined in the Transvaal Region)N090323 lbs0 lbs323 lbs
15Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)N090165 lbs0 lbs165 lbs
16Chlorine7782-50-5120 lbs0 lbs120 lbs
17Zinc compoundsN98238 lbs0 lbs38 lbs
18Boron trifluoride7637-07-236 lbs0 lbs36 lbs
19Nitric acid7697-37-224 lbs0 lbs24 lbs
20Nickel compoundsN4958 lbs0 lbs8 lbs
21Cyanide compoundsN1064 lbs0 lbs4 lbs
22Copper compoundsN1002 lbs0 lbs2 lbs
23Nickel And Nickel CompoundsN4952 lbs0 lbs2 lbs
24Manganese And Manganese CompoundsN4501 lbs0 lbs1 lbs

Top chemicals released near this property (2024 only):

Styrene, Zinc compounds, Methyl tert-butyl ether, 1,3-Butadiene, Ammonia

View the full list of 18 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (18 chemicals)

#ChemicalCAS#Air (lbs/yr)Water (lbs/yr)Total (lbs/yr)
1Styrene100-42-5130,675 lbs291 lbs130,967 lbs
2Zinc compoundsN9823 lbs0 lbs37,856 lbs
3Methyl tert-butyl ether1634-04-418,336 lbs0 lbs31,624 lbs
41,3-Butadiene106-99-030,943 lbs0 lbs30,943 lbs
5Ammonia7664-41-729,650 lbs78 lbs29,727 lbs
6Methanol67-56-16,850 lbs14,541 lbs21,992 lbs
7Nitric acid7697-37-23 lbs0 lbs8,478 lbs
8Nickel compoundsN4951 lbs0 lbs3,119 lbs
9Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)N09027 lbs0 lbs2,249 lbs
10N-Methyl-2-pyrrolidone872-50-42,081 lbs0 lbs2,081 lbs
11N,N-Dimethylformamide68-12-21,641 lbs0 lbs1,842 lbs
12Cyanide compoundsN1061 lbs0 lbs1,233 lbs
13Propylene115-07-11,091 lbs0 lbs1,091 lbs
14tert-Butyl alcohol75-65-01,021 lbs0 lbs1,021 lbs
15Lead And Lead CompoundsN4200 lbs0 lbs964 lbs
16Sodium nitrite7632-00-00 lbs371 lbs371 lbs
17Ethylene74-85-1364 lbs0 lbs364 lbs
18Boron trifluoride7637-07-21 lbs0 lbs1 lbs

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