Complete Property Analysis

Environmental risk, tax analysis, and property details for 4031 Thistledown Dr, Pasadena, TX 77504

HCAD #1064270030009

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🌍Environmental Assessment

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.

🌊Flood Risk Analysis

FEMA Zone X

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

4031 Thistledown Dr, Pasadena, TX 77504

Building Size

3,549sqft

Total structure area from HCAD building records.

Elevation

35.78 ft

Height above sea level from USGS data.

FEMA Flood Zone

Moderate to Low Risk - Outside 500-year floodplain

Overall Risk

Very High

Property flooded at 9.84ft depth.

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 High

Flood Depth

9.84 ft±0.5 ft

Depth of water above ground level.

Water Surface Elevation (WSE)

45.62 ft

Water surface elevation relative to sea level (NAVD88 datum).

Area Inundated

273.8 acres

92.8% of 500m radius flooded.

Nearest Bayou Stage

N/A

No nearby bayou within monitoring range

Depth-Damage (HCAD Valuation)

$157,238

Based on HCAD building value of $241,905.

Depth-Damage (Neighborhood)

$184,755

Based on neighborhood replacement cost.

Analysis Method

COG Combined 5000 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.

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.

Minimal flood hazard area - property outside mapped high-risk zones

Flood insurance available at preferred rates - over 25% of claims occur in low-risk areas

Review official FEMA Flood Insurance Rate Map (FIRM) for detailed flood zone boundaries

Contact Harris County Flood Control District (HCFCD) for drainage projects and flood information

🏭Industrial Pollution Exposure

39.2th percentile

Property Pollution Ranking

Moderate

Higher pollution than 61% of Houston homes

Compares pollution within 2mi against 10,000 Houston properties. Lower percentiles = higher pollution.

Industrial Pollution Nearby (10 Years)

66 thousandlbs

High

10.1x more than typical Houston property

≈ 3 dump trucks of chemicals within 2 miles

Air Pollution (10 Years)

66 thousandlbs

High

13.6x more than typical Houston property

Includes fugitive emissions (leaks) and stack emissions (smokestacks).

Water Pollution (10 Years)

0lbs

None

Discharges to bayous, streams, and drainage systems.

Facilities Nearby

Industrial facilities within 2 miles

💡

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.

Period	Total	Air
Typical Houston Property (2014-2024)	6,524 lbs	4,822 lbs
This Property (2014-2024)	65,661 lbs	65,661 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs
This Property (2024 Only)	3,298 lbs	3,298 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

70-79th

5.8%

80-89th

4.3%

90-100thLowest Pollution

34.2%

Higher pollution than 61% of Houston homes

Each bar's width represents the percentage of Houston homes in that pollution range. This property ranks in the 40-49th percentile (slightly higher than average).

📋

Top chemicals released near this property (past 10 years):
Xylene (mixed isomers), Toluene, Cyclohexane, n-Hexane, Methanol
View the full list of 14 chemicals below.

Chemicals Released (2014-2024, 10-Year Total)(14 chemicals)

#	Chemical	CAS#	Air (lbs/10yr)	Total (lbs/10yr)
1	Xylene (mixed isomers)	1330-20-7	18,800 lbs	18,806 lbs
2	Toluene	108-88-3	15,578 lbs	15,578 lbs
3	Cyclohexane	110-82-7	14,355 lbs	14,355 lbs
4	n-Hexane	110-54-3	6,091 lbs	6,091 lbs
5	Methanol	67-56-1	4,436 lbs	4,436 lbs
6	Certain glycol ethers	N230	1,924 lbs	1,924 lbs
7	Ethylbenzene	100-41-4	1,396 lbs	1,396 lbs
8	n-Butyl alcohol	71-36-3	1,280 lbs	1,280 lbs
9	Methyl isobutyl ketone	108-10-1	1,015 lbs	1,015 lbs
10	1,2,4-Trimethylbenzene	95-63-6	521 lbs	521 lbs
11	Ethylene glycol	107-21-1	209 lbs	209 lbs
12	Styrene	100-42-5	37 lbs	37 lbs
13	Nonylphenol	N530	15 lbs	15 lbs
14	Nonylphenol Ethoxylates	N535	3 lbs	3 lbs

📋

Top chemicals released near this property (2024 only):
Cyclohexane, Xylene (mixed isomers), n-Hexane, Toluene, Certain glycol ethers
View the full list of 9 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only)(9 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Total (lbs/yr)
1	Cyclohexane	110-82-7	1,469 lbs	1,469 lbs
2	Xylene (mixed isomers)	1330-20-7	594 lbs	594 lbs
3	n-Hexane	110-54-3	482 lbs	482 lbs
4	Toluene	108-88-3	401 lbs	401 lbs
5	Certain glycol ethers	N230	163 lbs	163 lbs
6	Ethylbenzene	100-41-4	135 lbs	135 lbs
7	n-Butyl alcohol	71-36-3	26 lbs	26 lbs
8	Styrene	100-42-5	15 lbs	15 lbs
9	1,2,4-Trimethylbenzene	95-63-6	13 lbs	13 lbs