Home > Analysis: 317 S 11th St, La Porte, TX 77571

📊 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

317 S 11TH ST LA PORTE 77571

Building Size

1,671 sqft

Total structure area from HCAD building records.

Elevation

17.74 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: 7.74 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 84% 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)

2.07 million lbs

Extremely High

316.6x more than typical Houston property
≈ 103 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)

2.07 million lbs

Extremely High

428.4x 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)

1 lbs

Low

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)	2,065,825 lbs	2,065,825 lbs	1 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	1,348,507 lbs	245,878 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 84% 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, Ammonia, Hydroquinone

View the full list of 46 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (46 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	427,145	0	427,145
3	Methanol	67-56-1	179,178	0	179,178
4	Ammonia	7664-41-7	105,663	0	105,663
5	Hydroquinone	123-31-9	42,495	0	42,495
6	Propylene	115-07-1	41,301	0	41,301
7	Methyl isobutyl ketone	108-10-1	36,313	0	36,313
8	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
9	Cumene	98-82-8	31,096	0	31,096
10	Vinyl acetate	108-05-4	22,306	0	22,306
11	Propylene oxide	75-56-9	16,752	0	16,752
12	Xylene (mixed isomers)	1330-20-7	16,006	0	16,006
13	Acetaldehyde	75-07-0	12,256	0	12,256
14	Benzene	71-43-2	10,536	0	10,536
15	Chlorine	7782-50-5	10,430	0	10,430
16	Styrene	100-42-5	8,897	0	8,897
17	Toluene	108-88-3	4,300	0	4,300
18	Chloroacetic acid	79-11-8	4,175	0	4,175
19	Acrylic acid	79-10-7	3,532	0	3,532
20	Chlorobenzene	108-90-7	3,127	0	3,127
21	Methyl methacrylate	80-62-6	3,050	0	3,050
22	1,2-Butylene oxide	106-88-7	2,348	0	2,348
23	Phosgene	75-44-5	1,958	0	1,958
24	Allyl alcohol	107-18-6	1,820	0	1,820
25	Acetonitrile	75-05-8	1,765	0	1,765
26	Aluminum oxide (fibrous forms)	1344-28-1	1,750	0	1,750
27	Methyl tert-butyl ether	1634-04-4	1,591	0	1,591
28	Triethylamine	121-44-8	1,515	0	1,515
29	Ethyl chloroformate	541-41-3	1,467	0	1,467
30	Methyl chlorocarbonate	79-22-1	1,449	0	1,449
31	sec-Butyl alcohol	78-92-2	1,434	0	1,434
32	Ethylene oxide	75-21-8	1,431	0	1,431
33	tert-Butyl alcohol	75-65-0	1,254	0	1,254
34	n-Butyl alcohol	71-36-3	1,211	0	1,211
35	Dicyclopentadiene	77-73-6	1,178	0	1,178
36	Diphenylamine	122-39-4	997	0	997
37	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	597	0	597
38	N,N-Dimethylformamide	68-12-2	535	0	535
39	Manganese	7439-96-5	511	0	511
40	Dichloromethane	75-09-2	251	0	251
41	Ethylene glycol	107-21-1	54	0	54
42	Chromium	7440-47-3	45	0	45
43	Cyclohexane	110-82-7	41	0	41
44	Phthalic anhydride	85-44-9	13	0	13
45	Butyl acrylate	141-32-2	5	0	5
46	Nickel compounds	N495	0	1	1

Top chemicals released near this property (2024 only):

Aluminum oxide (fibrous forms), Methanol, Allyl alcohol, n-Hexane, Toluene

View the full list of 35 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (35 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	10,953	335,512
3	Allyl alcohol	107-18-6	96	233,588
4	n-Hexane	110-54-3	116,901	132,814
5	Toluene	108-88-3	196	75,795
6	Ethylene	74-85-1	72,650	72,650
7	Xylene (mixed isomers)	1330-20-7	88	25,339
8	Chloroacetic acid	79-11-8	476	20,694
9	Styrene	100-42-5	272	15,702
10	tert-Butyl alcohol	75-65-0	26	15,456
11	Propylene	115-07-1	10,535	10,535
12	Ammonia	7664-41-7	8,690	8,916
13	Dicyclopentadiene	77-73-6	97	7,551
14	Vinyl acetate	108-05-4	2,418	7,117
15	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	6,255	6,255
16	Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)	N090	0	5,055
17	Hydroquinone	123-31-9	4,862	4,862
18	Methyl isobutyl ketone	108-10-1	3,997	3,997
19	sec-Butyl alcohol	78-92-2	93	3,447
20	n-Butyl alcohol	71-36-3	85	2,624
21	Cumene	98-82-8	2,611	2,611
22	Acetaldehyde	75-07-0	494	1,132
23	Benzene	71-43-2	1,090	1,090
24	Chlorine	7782-50-5	961	961
25	Propylene oxide	75-56-9	430	430
26	Ethylene oxide	75-21-8	420	420
27	Methyl methacrylate	80-62-6	387	387
28	Acrylic acid	79-10-7	186	192
29	Ethyl chloroformate	541-41-3	120	120
30	Diphenylamine	122-39-4	103	103
31	1,2-Butylene oxide	106-88-7	52	52
32	Cyclohexane	110-82-7	41	41
33	Phosgene	75-44-5	27	27
34	Methyl chlorocarbonate	79-22-1	13	13
35	Ethylene glycol	107-21-1	3	9