Home > Analysis: 803 Garden Walk Dr, La Porte, TX 77571 08/13/2025

📊 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

803 GARDEN WALK DR LA PORTE 77571

Building Size

1,576 sqft

Total structure area from HCAD building records.

Elevation

13.54 ft

Height above sea level from USGS data.

FEMA Flood Zone

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)

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: 3.54 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)

3.6 million lbs

Extremely High

552.0x more than typical Houston property
≈ 180 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)

3.6 million lbs

Extremely High

746.7x 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)

479 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)	3,601,185 lbs	3,600,707 lbs	479 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	1,912,042 lbs	330,930 lbs	5 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 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):

n-Hexane, Ethylene, Methanol, Toluene, Ammonia

View the full list of 59 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (59 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	n-Hexane	110-54-3	1,028,988	0	1,028,988
2	Ethylene	74-85-1	743,892	0	743,892
3	Methanol	67-56-1	442,608	55	442,663
4	Toluene	108-88-3	429,470	0	429,470
5	Ammonia	7664-41-7	310,361	0	310,361
6	Vinyl acetate	108-05-4	139,491	0	139,491
7	Acrylonitrile	107-13-1	83,639	0	83,639
8	n-Butyl alcohol	71-36-3	55,640	0	55,640
9	Hydroquinone	123-31-9	42,495	0	42,495
10	Propylene	115-07-1	36,801	0	36,801
11	Methyl isobutyl ketone	108-10-1	36,313	0	36,313
12	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	35,668	0	35,668
13	Cumene	98-82-8	31,096	0	31,096
14	Xylene (mixed isomers)	1330-20-7	30,648	0	30,648
15	Phenol	108-95-2	30,497	0	30,497
16	Propylene oxide	75-56-9	16,752	0	16,752
17	Acetaldehyde	75-07-0	14,843	0	14,843
18	Styrene	100-42-5	13,938	0	13,938
19	Chlorine	7782-50-5	12,676	0	12,676
20	Benzene	71-43-2	10,536	0	10,536
21	Diphenylamine	122-39-4	5,851	0	5,851
22	Ethylbenzene	100-41-4	5,213	0	5,213
23	Chloroacetic acid	79-11-8	4,175	0	4,175
24	Acrylic acid	79-10-7	3,532	0	3,532
25	Chlorobenzene	108-90-7	3,127	0	3,127
26	Methyl methacrylate	80-62-6	3,050	0	3,050
27	Formaldehyde	50-00-0	2,692	0	2,692
28	1,2-Butylene oxide	106-88-7	2,348	0	2,348
29	Dimethylamine	124-40-3	2,009	0	2,009
30	Phosgene	75-44-5	1,958	0	1,958
31	Allyl alcohol	107-18-6	1,820	0	1,820
32	Acetonitrile	75-05-8	1,765	0	1,765
33	Methyl tert-butyl ether	1634-04-4	1,591	0	1,591
34	Triethylamine	121-44-8	1,515	0	1,515
35	Ethyl chloroformate	541-41-3	1,467	0	1,467
36	Methyl chlorocarbonate	79-22-1	1,449	0	1,449
37	sec-Butyl alcohol	78-92-2	1,434	0	1,434
38	Ethylene oxide	75-21-8	1,431	0	1,431
39	Nitric acid	7697-37-2	1,419	0	1,419
40	tert-Butyl alcohol	75-65-0	1,254	0	1,254
41	Dicyclopentadiene	77-73-6	1,178	0	1,178
42	Maleic anhydride	108-31-6	965	0	965
43	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	597	0	597
44	N,N-Dimethylformamide	68-12-2	535	0	535
45	Ethylene glycol	107-21-1	527	0	527
46	Manganese	7439-96-5	511	0	511
47	Hydrazine	302-01-2	437	0	437
48	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	370	370
49	Dichloromethane	75-09-2	251	0	251
50	1,2,4-Trimethylbenzene	95-63-6	70	0	70
51	Zinc compounds	N982	35	33	68
52	Naphthalene	91-20-3	63	0	63
53	Cyclohexane	110-82-7	41	0	41
54	Antimony compounds	N010	20	15	35
55	Phthalic anhydride	85-44-9	13	0	13
56	Antimony And Antimony Compounds	N010	5	5	10
57	Butyl acrylate	141-32-2	5	0	5
58	Boron trifluoride	7637-07-2	1	0	1
59	Nickel compounds	N495	0	1	1

Top chemicals released near this property (2024 only):

Methanol, Allyl alcohol, n-Hexane, Vinyl acetate, Toluene

View the full list of 45 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (45 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Methanol	67-56-1	26,140	5	890,211
2	Allyl alcohol	107-18-6	96	0	233,588
3	n-Hexane	110-54-3	116,901	0	132,814
4	Vinyl acetate	108-05-4	14,116	0	128,626
5	Toluene	108-88-3	14,243	0	102,639
6	Ethylene	74-85-1	96,034	0	96,034
7	Dimethylamine	124-40-3	228	0	91,985
8	Diphenylamine	122-39-4	105	0	48,731
9	Xylene (mixed isomers)	1330-20-7	684	0	26,017
10	Ammonia	7664-41-7	25,258	0	25,484
11	Acetaldehyde	75-07-0	496	0	23,127
12	Chloroacetic acid	79-11-8	476	0	20,694
13	Styrene	100-42-5	530	0	15,960
14	tert-Butyl alcohol	75-65-0	26	0	15,456
15	Propylene	115-07-1	10,035	0	10,035
16	Dicyclopentadiene	77-73-6	97	0	7,551
17	Phenol	108-95-2	1,875	0	6,506
18	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	6,374	0	6,374
19	Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)	N090	0	0	5,055
20	Hydroquinone	123-31-9	4,862	0	4,862
21	n-Butyl alcohol	71-36-3	1,017	0	4,633
22	Methyl isobutyl ketone	108-10-1	3,997	0	3,997
23	sec-Butyl alcohol	78-92-2	93	0	3,447
24	Cumene	98-82-8	2,611	0	2,611
25	Benzene	71-43-2	1,090	0	1,090
26	Chlorine	7782-50-5	961	0	961
27	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	0	551
28	Propylene oxide	75-56-9	430	0	430
29	Ethylene oxide	75-21-8	420	0	420
30	Methyl methacrylate	80-62-6	387	0	387
31	Naphthalene	91-20-3	12	0	371
32	Ethylbenzene	100-41-4	271	0	283
33	Nitric acid	7697-37-2	219	0	219
34	Acrylic acid	79-10-7	186	0	192
35	Maleic anhydride	108-31-6	178	0	178
36	Formaldehyde	50-00-0	151	0	154
37	Ethyl chloroformate	541-41-3	120	0	120
38	1,2-Butylene oxide	106-88-7	52	0	52
39	Cyclohexane	110-82-7	41	0	41
40	Hydrazine	302-01-2	39	0	39
41	Antimony And Antimony Compounds	N010	0	0	33
42	Phosgene	75-44-5	27	0	27
43	1,2,4-Trimethylbenzene	95-63-6	25	0	25
44	Ethylene glycol	107-21-1	15	0	21
45	Methyl chlorocarbonate	79-22-1	13	0	13