Home > Analysis: 505 N 11th St, La Porte, TX 77571 03/03/2025

📊 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

505 N 11TH ST LA PORTE 77571

Building Size

1,667 sqft

Total structure area from HCAD building records.

Elevation

18.5 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: 8.5 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.

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 82% 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)

1.25 million lbs

Extremely High

192.0x more than typical Houston property
≈ 63 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)

1.22 million lbs

Extremely High

253.3x 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)

94 lbs

Above Typical

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)	1,252,770 lbs	1,221,476 lbs	94 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	812,835 lbs	96,607 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 82% 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):

Methanol, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Ammonia, Formaldehyde, Propylene

View the full list of 45 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (45 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	Methanol	67-56-1	439,205	0	439,205
2	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	216,585	0	216,585
3	Ammonia	7664-41-7	105,663	0	105,663
4	Formaldehyde	50-00-0	63,808	0	63,808
5	Propylene	115-07-1	49,954	0	49,954
6	n-Butyl alcohol	71-36-3	49,206	0	49,206
7	Hydroquinone	123-31-9	42,495	0	42,495
8	Methyl isobutyl ketone	108-10-1	36,313	0	36,313
9	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	33,058	0	33,058
10	Cumene	98-82-8	31,096	0	31,096
11	Ethylene	74-85-1	29,857	0	29,857
12	Copper compounds	N100	1	84	29,084
13	Vinyl acetate	108-05-4	22,306	0	22,306
14	Hydrogen fluoride	7664-39-3	17,939	0	17,939
15	Acetaldehyde	75-07-0	12,256	0	12,256
16	Chlorine	7782-50-5	11,230	0	11,230
17	Benzene	71-43-2	10,536	0	10,536
18	Xylene (mixed isomers)	1330-20-7	10,381	0	10,381
19	Styrene	100-42-5	7,344	0	7,344
20	Chloroacetic acid	79-11-8	4,175	0	4,175
21	Acrylic acid	79-10-7	3,532	0	3,532
22	Chlorobenzene	108-90-7	3,127	0	3,127
23	Methyl methacrylate	80-62-6	3,050	0	3,050
24	Mercury	7439-97-6	0	0	2,200
25	Phosgene	75-44-5	1,958	0	1,958
26	Acetonitrile	75-05-8	1,765	0	1,765
27	Aluminum oxide (fibrous forms)	1344-28-1	1,750	0	1,750
28	Methyl tert-butyl ether	1634-04-4	1,591	0	1,591
29	Triethylamine	121-44-8	1,515	0	1,515
30	Ethyl chloroformate	541-41-3	1,467	0	1,467
31	Methyl chlorocarbonate	79-22-1	1,449	0	1,449
32	sec-Butyl alcohol	78-92-2	1,434	0	1,434
33	Ethylene oxide	75-21-8	1,431	0	1,431
34	Toluene	108-88-3	1,261	0	1,261
35	Diphenylamine	122-39-4	997	0	997
36	N,N-Dimethylformamide	68-12-2	535	0	535
37	Manganese	7439-96-5	511	0	511
38	Propylene oxide	75-56-9	371	0	371
39	Dichloromethane	75-09-2	251	0	251
40	Chromium	7440-47-3	45	0	45
41	Ethylene glycol	107-21-1	14	0	14
42	Nickel compounds	N495	4	3	8
43	Copper And Copper Compounds	N100	0	6	6
44	Butyl acrylate	141-32-2	5	0	5
45	Nickel And Nickel Compounds	N495	2	1	3

Top chemicals released near this property (2024 only):

Aluminum oxide (fibrous forms), Methanol, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Chloroacetic acid, Propylene

View the full list of 30 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (30 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Total (lbs/yr)
1	Aluminum oxide (fibrous forms)	1344-28-1	250	353,010
2	Methanol	67-56-1	16,034	340,606
3	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	29,545	29,545
4	Chloroacetic acid	79-11-8	476	20,694
5	Propylene	115-07-1	10,535	10,535
6	Ammonia	7664-41-7	8,690	8,916
7	Vinyl acetate	108-05-4	2,418	7,117
8	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	6,255	6,255
9	Formaldehyde	50-00-0	3,559	5,799
10	Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)	N090	0	5,055
11	Hydroquinone	123-31-9	4,862	4,862
12	Methyl isobutyl ketone	108-10-1	3,997	3,997
13	sec-Butyl alcohol	78-92-2	93	3,447
14	Cumene	98-82-8	2,611	2,611
15	n-Butyl alcohol	71-36-3	75	2,529
16	Hydrogen fluoride	7664-39-3	1,738	1,738
17	Ethylene	74-85-1	1,329	1,329
18	Acetaldehyde	75-07-0	494	1,132
19	Chlorine	7782-50-5	1,121	1,121
20	Benzene	71-43-2	1,090	1,090
21	Ethylene oxide	75-21-8	420	420
22	Methyl methacrylate	80-62-6	387	387
23	Acrylic acid	79-10-7	186	192
24	Ethyl chloroformate	541-41-3	120	120
25	Styrene	100-42-5	116	116
26	Diphenylamine	122-39-4	103	103
27	Propylene oxide	75-56-9	60	60
28	Phosgene	75-44-5	27	27
29	Methyl chlorocarbonate	79-22-1	13	13
30	Ethylene glycol	107-21-1	3	9