Home > Analysis: 9731 Shell Rock Rd, 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

9731 SHELL ROCK RD LA PORTE 77571

Building Size

2,309 sqft

Total structure area from HCAD building records.

Elevation

24.64 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: 14.64 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 86% 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)

3.05 million lbs

Extremely High

466.7x more than typical Houston property
≈ 152 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)

3.02 million lbs

Extremely High

626.7x 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)

16 thousand lbs

Extremely 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)	3,045,072 lbs	3,022,050 lbs	16,336 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	1,383,799 lbs	296,667 lbs	1,275 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 86% 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, Ammonia, Nitric acid, Ethylene glycol

View the full list of 48 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (48 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	n-Hexane	110-54-3	1,020,298	0	1,020,298
2	Ethylene	74-85-1	723,170	0	723,170
3	Ammonia	7664-41-7	413,789	123	413,932
4	Nitric acid	7697-37-2	397,654	55	397,734
5	Ethylene glycol	107-21-1	104,863	0	104,863
6	Ethylene oxide	75-21-8	98,927	0	98,927
7	Certain glycol ethers	N230	46,549	0	46,550
8	Molybdenum trioxide	1313-27-5	37,655	3,227	40,897
9	Methanol	67-56-1	26,479	0	33,006
10	Hydrogen sulfide	7783-06-4	31,678	0	31,678
11	Acetaldehyde	75-07-0	25,328	0	25,328
12	Nickel compounds	N495	11,795	1,904	13,714
13	n-Butyl alcohol	71-36-3	12,669	0	12,669
14	2-Methoxyethanol	109-86-4	11,669	0	11,669
15	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	30	9,885	9,930
16	Toluene	108-88-3	9,589	0	9,589
17	Chloroethane	75-00-3	9,070	0	9,070
18	Cobalt compounds	N096	5,871	886	6,772
19	2-Ethoxyethanol	110-80-5	6,044	0	6,044
20	tert-Butyl alcohol	75-65-0	5,606	0	5,606
21	Nickel And Nickel Compounds	N495	4,878	62	4,940
22	Cobalt And Cobalt Compounds	N096	4,551	42	4,593
23	Xylene (mixed isomers)	1330-20-7	2,454	0	2,454
24	Propylene oxide	75-56-9	1,981	0	1,981
25	Dimethylamine	124-40-3	1,745	0	1,745
26	Allyl alcohol	107-18-6	1,569	0	1,569
27	Nonylphenol	N530	1,013	0	1,013
28	Nonylphenol Ethoxylates	N535	1,008	0	1,008
29	1,2,4-Trimethylbenzene	95-63-6	995	0	995
30	Cyclohexane	110-82-7	857	0	857
31	Maleic anhydride	108-31-6	612	0	612
32	Benzoyl chloride	98-88-4	469	0	469
33	Lead And Lead Compounds	N420	211	10	221
34	Barium compounds (except for barium sulfate (CAS No. 7727-43-7))	N040	145	30	175
35	Bifenthrin	82657-04-3	149	0	149
36	Formaldehyde	50-00-0	46	102	148
37	Lead compounds	N420	138	4	142
38	Copper compounds	N100	132	6	138
39	Ethylbenzene	100-41-4	94	0	94
40	Diphenylamine	122-39-4	87	0	87
41	Cumene	98-82-8	77	0	77
42	Cyanide compounds	N106	5	0	58
43	Chloromethane	74-87-3	51	0	51
44	Naphthalene	91-20-3	33	0	33
45	Oxyfluorfen	42874-03-3	10	0	10
46	Bis(2-chloroethyl) ether	111-44-4	3	0	3
47	Cumene hydroperoxide	80-15-9	2	0	2
48	Methyl methacrylate	80-62-6	2	0	2

Top chemicals released near this property (2024 only):

Methanol, Ethylene glycol, n-Hexane, tert-Butyl alcohol, Nonylphenol Ethoxylates

View the full list of 43 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (43 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Methanol	67-56-1	4,285	0	515,662
2	Ethylene glycol	107-21-1	3,267	0	147,087
3	n-Hexane	110-54-3	117,147	0	117,671
4	tert-Butyl alcohol	75-65-0	467	0	93,900
5	Nonylphenol Ethoxylates	N535	131	0	93,342
6	Ethylene	74-85-1	90,297	0	90,297
7	Molybdenum trioxide	1313-27-5	2,770	482	79,984
8	Ammonia	7664-41-7	45,360	5	46,960
9	1,2,4-Trimethylbenzene	95-63-6	74	0	44,010
10	Copper	7440-50-8	0	0	27,230
11	Ethylene oxide	75-21-8	7,605	0	16,153
12	Toluene	108-88-3	295	0	15,888
13	Xylene (mixed isomers)	1330-20-7	39	0	13,258
14	Certain glycol ethers	N230	3,460	0	13,228
15	Nickel And Nickel Compounds	N495	82	8	12,690
16	Chloroethane	75-00-3	3,424	0	9,649
17	Nitric acid	7697-37-2	9,488	5	9,498
18	Nickel compounds	N495	1,017	108	7,851
19	Naphthalene	91-20-3	0	0	4,065
20	Hydrogen sulfide	7783-06-4	3,596	0	3,596
21	n-Butyl alcohol	71-36-3	1,271	0	3,468
22	Cobalt compounds	N096	455	36	2,816
23	Cumene	98-82-8	4	0	2,713
24	Ethylbenzene	100-41-4	4	0	2,643
25	Styrene	100-42-5	0	0	1,734
26	Cumene hydroperoxide	80-15-9	0	0	1,560
27	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	622	1,122
28	2-Methoxyethanol	109-86-4	1,027	0	1,045
29	Acetaldehyde	75-07-0	375	0	1,034
30	Cobalt And Cobalt Compounds	N096	82	8	917
31	Formaldehyde	50-00-0	3	0	513
32	2-Ethoxyethanol	110-80-5	407	0	429
33	Maleic anhydride	108-31-6	8	0	414
34	Dimethyl phthalate	131-11-3	0	0	406
35	Cyclohexane	110-82-7	24	0	315
36	Nonylphenol	N530	1	0	224
37	Propylene oxide	75-56-9	39	0	203
38	Dimethylamine	124-40-3	113	0	113
39	Lead And Lead Compounds	N420	16	1	68
40	Benzoyl chloride	98-88-4	33	0	33
41	Methyl methacrylate	80-62-6	0	0	4
42	Acrylonitrile	107-13-1	0	0	4
43	Aniline	62-53-3	0	0	2