Home > Analysis: 9401 Montgomery Ln, La Porte, TX 77571 09/19/2025

📊 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

9401 MONTGOMERY LN LA PORTE 77571

Building Size

1,620 sqft

Total structure area from HCAD building records.

Elevation

23.5 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: 13.5 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 58% 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)

33 thousand lbs

Above Typical

5.1x more than typical Houston property
≈ 2 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)

26 thousand lbs

Above Typical

5.5x 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)

170 lbs

High

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	Water
Typical Houston Property (2014-2024)	6,524 lbs	4,822 lbs	0 lbs
This Property (2014-2024)	33,250 lbs	26,498 lbs	170 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	608,941 lbs	2,944 lbs	0 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 58% 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):

Methanol, n-Hexane, Dimethylamine, Certain glycol ethers, Ammonia

View the full list of 27 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (27 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	Methanol	67-56-1	9,356	0	15,883
2	n-Hexane	110-54-3	7,167	0	7,167
3	Dimethylamine	124-40-3	1,745	0	1,745
4	Certain glycol ethers	N230	1,449	0	1,450
5	Ammonia	7664-41-7	961	68	1,029
6	1,2,4-Trimethylbenzene	95-63-6	971	0	971
7	Xylene (mixed isomers)	1330-20-7	874	0	874
8	Cyclohexane	110-82-7	857	0	857
9	Toluene	108-88-3	809	0	809
10	Ethylene oxide	75-21-8	791	0	791
11	Maleic anhydride	108-31-6	612	0	612
12	Nitric acid	7697-37-2	201	0	201
13	Bifenthrin	82657-04-3	149	0	149
14	Formaldehyde	50-00-0	46	102	148
15	Propylene oxide	75-56-9	132	0	132
16	Ethylbenzene	100-41-4	94	0	94
17	Diphenylamine	122-39-4	87	0	87
18	Cumene	98-82-8	68	0	68
19	Cyanide compounds	N106	5	0	58
20	Chloromethane	74-87-3	51	0	51
21	Naphthalene	91-20-3	33	0	33
22	tert-Butyl alcohol	75-65-0	23	0	23
23	Oxyfluorfen	42874-03-3	10	0	10
24	Bis(2-chloroethyl) ether	111-44-4	3	0	3
25	Methyl methacrylate	80-62-6	2	0	2
26	Ethylene glycol	107-21-1	1	0	1
27	n-Butyl alcohol	71-36-3	1	0	1

Top chemicals released near this property (2024 only):

Methanol, 1,2,4-Trimethylbenzene, Toluene, Xylene (mixed isomers), Nonylphenol Ethoxylates

View the full list of 17 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (17 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Total (lbs/yr)
1	Methanol	67-56-1	1,986	510,256
2	1,2,4-Trimethylbenzene	95-63-6	74	43,988
3	Toluene	108-88-3	16	13,930
4	Xylene (mixed isomers)	1330-20-7	39	13,258
5	Nonylphenol Ethoxylates	N535	0	11,809
6	Naphthalene	91-20-3	0	4,040
7	Ethylene oxide	75-21-8	63	2,763
8	Cumene	98-82-8	4	2,713
9	Ethylbenzene	100-41-4	4	2,630
10	Ethylene glycol	107-21-1	0	1,138
11	n-Hexane	110-54-3	607	631
12	Formaldehyde	50-00-0	3	513
13	Ammonia	7664-41-7	2	428
14	Maleic anhydride	108-31-6	8	414
15	Cyclohexane	110-82-7	24	315
16	Dimethylamine	124-40-3	113	113
17	Propylene oxide	75-56-9	1	1