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
451 SHOTWELL ST HOUSTON 77020
Building Size
912 sqft
Total structure area from HCAD building records.
Elevation
43.84 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: 33.84 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
High
Higher pollution than 76% 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)
513 thousand lbs
Very High
78.7x more than typical Houston property
≈ 26 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)
508 thousand lbs
Extremely High
105.3x 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)
6 thousand lbs
Very 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)513,464 lbs507,616 lbs5,848 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)135,892 lbs55,984 lbs995 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 76% 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):

Xylene (mixed isomers), n-Hexane, Styrene, n-Butyl alcohol, Zinc compounds

View the full list of 40 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (40 chemicals)

#ChemicalCAS#Air (lbs, 10yr)Water (lbs, 10yr)Total (lbs, 10yr)
1Xylene (mixed isomers)1330-20-7141,882 lbs0 lbs141,882 lbs
2n-Hexane110-54-3125,640 lbs0 lbs125,640 lbs
3Styrene100-42-578,090 lbs0 lbs78,090 lbs
4n-Butyl alcohol71-36-333,617 lbs0 lbs33,617 lbs
5Zinc compoundsN98222,813 lbs4,977 lbs27,790 lbs
6Toluene108-88-325,336 lbs0 lbs26,509 lbs
7Phenol108-95-224,642 lbs0 lbs24,642 lbs
8Ammonia7664-41-716,230 lbs0 lbs16,230 lbs
9Ethylbenzene100-41-416,163 lbs0 lbs16,163 lbs
101,2,4-Trimethylbenzene95-63-68,965 lbs0 lbs8,965 lbs
11Methyl isobutyl ketone108-10-13,355 lbs0 lbs3,355 lbs
12Cyclohexane110-82-72,389 lbs0 lbs2,389 lbs
13Formaldehyde50-00-01,893 lbs0 lbs1,893 lbs
14Methanol67-56-11,849 lbs0 lbs1,849 lbs
15Ethylene glycol107-21-11,461 lbs0 lbs1,461 lbs
16Methyl tert-butyl ether1634-04-41,021 lbs0 lbs1,021 lbs
17Propylene115-07-1810 lbs0 lbs810 lbs
18Manganese7439-96-5166 lbs336 lbs503 lbs
19Lead7439-92-1174 lbs66 lbs240 lbs
20Manganese compoundsN45018 lbs208 lbs226 lbs
21Benzene71-43-2218 lbs0 lbs218 lbs
22Zinc (fume or dust)7440-66-6201 lbs0 lbs201 lbs
23Naphthalene91-20-3194 lbs0 lbs194 lbs
24Chromium compounds (except for chromite ore mined in the Transvaal Region)N090141 lbs15 lbs156 lbs
25DiisocyanatesN120101 lbs4 lbs105 lbs
26Aluminum oxide (fibrous forms)1344-28-11 lbs98 lbs99 lbs
27Copper7440-50-867 lbs0 lbs67 lbs
28Barium compounds (except for barium sulfate (CAS No. 7727-43-7))N0400 lbs67 lbs67 lbs
29Nickel7440-02-023 lbs38 lbs61 lbs
30Lead compoundsN42038 lbs22 lbs60 lbs
31Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)N09032 lbs1 lbs33 lbs
32Polycyclic aromatic compoundsN59026 lbs0 lbs26 lbs
33Aluminum (fume or dust)7429-90-524 lbs0 lbs24 lbs
34Chromium7440-47-316 lbs0 lbs20 lbs
35Barium And Barium CompoundsN0400 lbs16 lbs16 lbs
36Nitrate compounds (water dissociable; reportable only when in aqueous solution)N51115 lbs0 lbs15 lbs
37Cobalt7440-48-40 lbs0 lbs4 lbs
38Lead And Lead CompoundsN4203 lbs1 lbs3 lbs
39Molybdenum trioxide1313-27-51 lbs0 lbs1 lbs
40Cumene98-82-81 lbs0 lbs1 lbs

Top chemicals released near this property (2024 only):

Zinc compounds, Manganese, Xylene (mixed isomers), n-Hexane, Toluene

View the full list of 19 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (19 chemicals)

#ChemicalCAS#Air (lbs/yr)Water (lbs/yr)Total (lbs/yr)
1Zinc compoundsN9823,361 lbs739 lbs60,903 lbs
2Manganese7439-96-50 lbs41 lbs19,987 lbs
3Xylene (mixed isomers)1330-20-717,453 lbs0 lbs17,453 lbs
4n-Hexane110-54-312,290 lbs0 lbs12,290 lbs
5Toluene108-88-311,886 lbs0 lbs11,886 lbs
6Styrene100-42-59,639 lbs0 lbs9,639 lbs
7Nickel7440-02-00 lbs31 lbs2,080 lbs
81,2,4-Trimethylbenzene95-63-61,210 lbs0 lbs1,210 lbs
9Methanol67-56-1125 lbs0 lbs125 lbs
10Manganese compoundsN4502 lbs116 lbs118 lbs
11Lead compoundsN4205 lbs3 lbs60 lbs
12Barium compounds (except for barium sulfate (CAS No. 7727-43-7))N0400 lbs19 lbs53 lbs
13Aluminum oxide (fibrous forms)1344-28-10 lbs42 lbs42 lbs
14Molybdenum trioxide1313-27-50 lbs0 lbs21 lbs
15Ethylene glycol107-21-110 lbs0 lbs10 lbs
16Lead7439-92-10 lbs5 lbs5 lbs
17Nickel And Nickel CompoundsN4950 lbs0 lbs5 lbs
18Polycyclic aromatic compoundsN5903 lbs0 lbs3 lbs
19Vanadium (except when contained in an alloy)7440-62-20 lbs0 lbs3 lbs

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