Home > Analysis: 405 Spencer Lndg W, La Porte, TX 77571 08/14/2025

📊 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

405 SPENCER LNDG W LA PORTE 77571

Building Size

2,984 sqft

Total structure area from HCAD building records.

Elevation

22.55 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: 12.55 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)

2.06 million lbs

Extremely High

316.4x 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)

2.06 million lbs

Extremely High

426.6x 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)

5 thousand lbs

Very 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)	2,064,577 lbs	2,056,996 lbs	5,381 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	1,199,848 lbs	252,433 lbs	618 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 50 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (50 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	n-Hexane	110-54-3	1,013,131	0	1,013,131
2	Ethylene	74-85-1	427,145	0	427,145
3	Methanol	67-56-1	151,151	0	151,151
4	Ammonia	7664-41-7	106,624	68	106,692
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	Hydrogen sulfide	7783-06-4	31,678	0	31,678
10	Cumene	98-82-8	31,165	0	31,165
11	Molybdenum trioxide	1313-27-5	27,245	3,165	30,410
12	Vinyl acetate	108-05-4	22,306	0	22,306
13	Acetaldehyde	75-07-0	12,256	0	12,256
14	Xylene (mixed isomers)	1330-20-7	11,256	0	11,256
15	Nickel compounds	N495	9,885	1,148	11,033
16	Benzene	71-43-2	10,536	0	10,536
17	Chlorine	7782-50-5	10,430	0	10,430
18	Styrene	100-42-5	7,344	0	7,344
19	Cobalt compounds	N096	3,961	866	4,827
20	Chloroacetic acid	79-11-8	4,175	0	4,175
21	Acrylic acid	79-10-7	3,532	0	3,532
22	Methyl methacrylate	80-62-6	3,052	0	3,052
23	Ethylene oxide	75-21-8	2,222	0	2,222
24	Mercury	7439-97-6	0	0	2,200
25	Phosgene	75-44-5	1,958	0	1,958
26	Aluminum oxide (fibrous forms)	1344-28-1	1,750	0	1,750
27	Ethyl chloroformate	541-41-3	1,467	0	1,467
28	Methyl chlorocarbonate	79-22-1	1,449	0	1,449
29	sec-Butyl alcohol	78-92-2	1,434	0	1,434
30	n-Butyl alcohol	71-36-3	1,165	0	1,165
31	Diphenylamine	122-39-4	997	0	997
32	1,2,4-Trimethylbenzene	95-63-6	971	0	971
33	Toluene	108-88-3	807	0	807
34	Nickel And Nickel Compounds	N495	702	21	723
35	Manganese	7439-96-5	511	0	511
36	Propylene oxide	75-56-9	385	0	385
37	Cyclohexane	110-82-7	377	0	377
38	Cobalt And Cobalt Compounds	N096	300	5	305
39	Formaldehyde	50-00-0	46	102	148
40	Copper compounds	N100	132	6	138
41	Ethylbenzene	100-41-4	94	0	94
42	Chloromethane	74-87-3	51	0	51
43	Chromium	7440-47-3	45	0	45
44	N,N-Dimethylformamide	68-12-2	34	0	34
45	Naphthalene	91-20-3	33	0	33
46	Ethylene glycol	107-21-1	15	0	15
47	Butyl acrylate	141-32-2	5	0	5
48	Bis(2-chloroethyl) ether	111-44-4	3	0	3
49	Certain glycol ethers	N230	3	0	3
50	Maleic anhydride	108-31-6	1	0	1

Top chemicals released near this property (2024 only):

Methanol, Aluminum oxide (fibrous forms), n-Hexane, Ethylene, 1,2,4-Trimethylbenzene

View the full list of 41 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (41 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Methanol	67-56-1	11,092	0	431,034
2	Aluminum oxide (fibrous forms)	1344-28-1	250	0	353,010
3	n-Hexane	110-54-3	116,540	0	117,040
4	Ethylene	74-85-1	72,650	0	72,650
5	1,2,4-Trimethylbenzene	95-63-6	74	0	43,988
6	Molybdenum trioxide	1313-27-5	2,612	474	33,276
7	Chloroacetic acid	79-11-8	476	0	20,694
8	Toluene	108-88-3	16	0	13,930
9	Xylene (mixed isomers)	1330-20-7	39	0	13,258
10	Nonylphenol Ethoxylates	N535	0	0	11,809
11	Propylene	115-07-1	10,535	0	10,535
12	Ammonia	7664-41-7	8,692	0	9,344
13	Nickel compounds	N495	1,017	108	7,851
14	Vinyl acetate	108-05-4	2,418	0	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	0	6,255
16	Cumene	98-82-8	2,616	0	5,324
17	Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)	N090	0	0	5,055
18	Hydroquinone	123-31-9	4,862	0	4,862
19	Naphthalene	91-20-3	0	0	4,040
20	Methyl isobutyl ketone	108-10-1	3,997	0	3,997
21	Hydrogen sulfide	7783-06-4	3,596	0	3,596
22	sec-Butyl alcohol	78-92-2	93	0	3,447
23	Ethylene oxide	75-21-8	483	0	3,183
24	Cobalt compounds	N096	455	36	2,816
25	Ethylbenzene	100-41-4	4	0	2,630
26	n-Butyl alcohol	71-36-3	75	0	2,529
27	Ethylene glycol	107-21-1	3	0	1,147
28	Acetaldehyde	75-07-0	494	0	1,132
29	Benzene	71-43-2	1,090	0	1,090
30	Chlorine	7782-50-5	961	0	961
31	Formaldehyde	50-00-0	3	0	513
32	Maleic anhydride	108-31-6	0	0	400
33	Methyl methacrylate	80-62-6	387	0	387
34	Cyclohexane	110-82-7	24	0	315
35	Acrylic acid	79-10-7	186	0	192
36	Ethyl chloroformate	541-41-3	120	0	120
37	Styrene	100-42-5	116	0	116
38	Diphenylamine	122-39-4	103	0	103
39	Propylene oxide	75-56-9	61	0	61
40	Phosgene	75-44-5	27	0	27
41	Methyl chlorocarbonate	79-22-1	13	0	13