📊 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

11321 N H ST LA PORTE 77571

Building Size

3,760 sqft

Total structure area from HCAD building records.

Elevation

21.27 ft

Height above sea level from USGS data.

FEMA Flood Zone

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)

Property not flooded at current water level. No damage to calculate.

Depth-Damage Estimate (Neighborhood Comparison)

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: 11.27 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 81% 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)

1.07 million lbs

Extremely High

163.6x more than typical Houston property
≈ 53 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)

1.07 million lbs

Extremely High

221.3x 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)

0 lbs

Low

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.

Period	Total	Air
Typical Houston Property (2014-2024)	6,524 lbs	4,822 lbs
This Property (2014-2024)	1,067,245 lbs	1,067,245 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs
This Property (2024 Only)	1,777,983 lbs	77,070 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 81% 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):

Methanol, Ethylene, Vinyl acetate, Xylene (mixed isomers), Formaldehyde

View the full list of 25 chemicals below.

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

#	Chemical	CAS#	Air (lbs, 10yr)	Total (lbs, 10yr)
1	Methanol	67-56-1	458,073 lbs	458,073 lbs
2	Ethylene	74-85-1	312,775 lbs	312,775 lbs
3	Vinyl acetate	108-05-4	102,664 lbs	102,664 lbs
4	Xylene (mixed isomers)	1330-20-7	53,525 lbs	53,525 lbs
5	Formaldehyde	50-00-0	36,646 lbs	36,646 lbs
6	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	33,058 lbs	33,058 lbs
7	Ammonia	7664-41-7	17,995 lbs	17,995 lbs
8	Ethylene glycol	107-21-1	16,751 lbs	16,751 lbs
9	Chlorine	7782-50-5	11,230 lbs	11,230 lbs
10	Maleic anhydride	108-31-6	5,569 lbs	5,569 lbs
11	Propylene	115-07-1	4,500 lbs	4,500 lbs
12	Chloroacetic acid	79-11-8	4,175 lbs	4,175 lbs
13	Mercury	7439-97-6	0 lbs	2,200 lbs
14	Phosgene	75-44-5	1,958 lbs	1,958 lbs
15	Aluminum oxide (fibrous forms)	1344-28-1	1,750 lbs	1,750 lbs
16	Ethyl chloroformate	541-41-3	1,467 lbs	1,467 lbs
17	Methyl chlorocarbonate	79-22-1	1,449 lbs	1,449 lbs
18	sec-Butyl alcohol	78-92-2	1,434 lbs	1,434 lbs
19	n-Butyl alcohol	71-36-3	1,164 lbs	1,164 lbs
20	Manganese	7439-96-5	511 lbs	511 lbs
21	Naphthalene	91-20-3	245 lbs	245 lbs
22	Ethylbenzene	100-41-4	216 lbs	216 lbs
23	Chromium	7440-47-3	45 lbs	45 lbs
24	N,N-Dimethylformamide	68-12-2	34 lbs	34 lbs
25	Acetaldehyde	75-07-0	10 lbs	10 lbs

Top chemicals released near this property (2024 only):

Methanol, Aluminum oxide (fibrous forms), Maleic anhydride, Chloroacetic acid, Vinyl acetate

View the full list of 21 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (21 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Total (lbs/yr)
1	Methanol	67-56-1	44,110 lbs	1,217,174 lbs
2	Aluminum oxide (fibrous forms)	1344-28-1	250 lbs	353,010 lbs
3	Maleic anhydride	108-31-6	1,569 lbs	134,889 lbs
4	Chloroacetic acid	79-11-8	476 lbs	20,694 lbs
5	Vinyl acetate	108-05-4	6,880 lbs	20,379 lbs
6	Ethylene	74-85-1	9,510 lbs	9,510 lbs
7	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	6,255 lbs	6,255 lbs
8	Formaldehyde	50-00-0	3,559 lbs	5,799 lbs
9	sec-Butyl alcohol	78-92-2	93 lbs	3,447 lbs
10	n-Butyl alcohol	71-36-3	75 lbs	2,529 lbs
11	Xylene (mixed isomers)	1330-20-7	1,144 lbs	1,144 lbs
12	Chlorine	7782-50-5	1,121 lbs	1,121 lbs
13	Ammonia	7664-41-7	895 lbs	895 lbs
14	Propylene	115-07-1	500 lbs	500 lbs
15	Naphthalene	91-20-3	245 lbs	245 lbs
16	Ethylbenzene	100-41-4	216 lbs	216 lbs
17	Ethyl chloroformate	541-41-3	120 lbs	120 lbs
18	Phosgene	75-44-5	27 lbs	27 lbs
19	Acetaldehyde	75-07-0	10 lbs	15 lbs
20	Methyl chlorocarbonate	79-22-1	13 lbs	13 lbs
21	Ethylene glycol	107-21-1	1 lbs	1 lbs