Home > Analysis: 307 Spencer Lndg E, La Porte, TX 77571 08/07/2025

📊 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

307 SPENCER LNDG E LA PORTE 77571

Building Size

3,206 sqft

Total structure area from HCAD building records.

Elevation

20.74 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: 10.74 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 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)

2.89 million lbs

Extremely High

443.5x more than typical Houston property
≈ 145 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)

2.87 million lbs

Extremely High

596.2x 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)	2,893,605 lbs	2,874,963 lbs	16,336 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	1,311,851 lbs	303,244 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, Ammonia, Ethylene, Nitric acid, Methanol

View the full list of 56 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (56 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	Ammonia	7664-41-7	488,117	123	488,260
3	Ethylene	74-85-1	427,145	0	427,145
4	Nitric acid	7697-37-2	397,453	55	397,533
5	Methanol	67-56-1	166,394	0	166,394
6	Hydroquinone	123-31-9	42,495	0	42,495
7	Propylene	115-07-1	41,301	0	41,301
8	Molybdenum trioxide	1313-27-5	37,655	3,227	40,897
9	Methyl isobutyl ketone	108-10-1	36,313	0	36,313
10	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
11	Hydrogen sulfide	7783-06-4	31,678	0	31,678
12	Cumene	98-82-8	31,165	0	31,165
13	Vinyl acetate	108-05-4	22,306	0	22,306
14	Nickel compounds	N495	11,795	1,905	13,715
15	Acetaldehyde	75-07-0	12,256	0	12,256
16	Xylene (mixed isomers)	1330-20-7	11,256	0	11,256
17	Benzene	71-43-2	10,536	0	10,536
18	Chlorine	7782-50-5	10,430	0	10,430
19	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	30	9,885	9,930
20	Styrene	100-42-5	7,344	0	7,344
21	Cobalt compounds	N096	5,871	886	6,772
22	Nickel And Nickel Compounds	N495	4,878	62	4,940
23	Cobalt And Cobalt Compounds	N096	4,551	42	4,593
24	Chloroacetic acid	79-11-8	4,175	0	4,175
25	Acrylic acid	79-10-7	3,532	0	3,532
26	Methyl methacrylate	80-62-6	3,052	0	3,052
27	Ethylene oxide	75-21-8	2,222	0	2,222
28	Mercury	7439-97-6	0	0	2,200
29	Phosgene	75-44-5	1,958	0	1,958
30	Aluminum oxide (fibrous forms)	1344-28-1	1,750	0	1,750
31	Ethyl chloroformate	541-41-3	1,467	0	1,467
32	Methyl chlorocarbonate	79-22-1	1,449	0	1,449
33	sec-Butyl alcohol	78-92-2	1,434	0	1,434
34	n-Butyl alcohol	71-36-3	1,165	0	1,165
35	Diphenylamine	122-39-4	997	0	997
36	1,2,4-Trimethylbenzene	95-63-6	971	0	971
37	Toluene	108-88-3	807	0	807
38	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	597	0	597
39	Manganese	7439-96-5	511	0	511
40	Propylene oxide	75-56-9	385	0	385
41	Cyclohexane	110-82-7	377	0	377
42	Lead And Lead Compounds	N420	211	10	221
43	Barium compounds (except for barium sulfate (CAS No. 7727-43-7))	N040	145	30	175
44	Formaldehyde	50-00-0	46	102	148
45	Lead compounds	N420	138	4	142
46	Copper compounds	N100	132	6	138
47	Ethylbenzene	100-41-4	94	0	94
48	Chloromethane	74-87-3	51	0	51
49	Chromium	7440-47-3	45	0	45
50	N,N-Dimethylformamide	68-12-2	34	0	34
51	Naphthalene	91-20-3	33	0	33
52	Ethylene glycol	107-21-1	15	0	15
53	Butyl acrylate	141-32-2	5	0	5
54	Bis(2-chloroethyl) ether	111-44-4	3	0	3
55	Certain glycol ethers	N230	3	0	3
56	Maleic anhydride	108-31-6	1	0	1

Top chemicals released near this property (2024 only):

Methanol, Aluminum oxide (fibrous forms), n-Hexane, Molybdenum trioxide, Ethylene

View the full list of 46 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (46 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	Molybdenum trioxide	1313-27-5	2,770	482	79,984
5	Ethylene	74-85-1	72,650	0	72,650
6	Ammonia	7664-41-7	49,677	5	50,344
7	1,2,4-Trimethylbenzene	95-63-6	74	0	43,988
8	Chloroacetic acid	79-11-8	476	0	20,694
9	Toluene	108-88-3	16	0	13,930
10	Xylene (mixed isomers)	1330-20-7	39	0	13,258
11	Nickel And Nickel Compounds	N495	82	8	12,690
12	Nonylphenol Ethoxylates	N535	0	0	11,809
13	Propylene	115-07-1	10,535	0	10,535
14	Nitric acid	7697-37-2	9,488	5	9,498
15	Nickel compounds	N495	1,017	108	7,851
16	Vinyl acetate	108-05-4	2,418	0	7,117
17	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
18	Cumene	98-82-8	2,616	0	5,324
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	Naphthalene	91-20-3	0	0	4,040
22	Methyl isobutyl ketone	108-10-1	3,997	0	3,997
23	Hydrogen sulfide	7783-06-4	3,596	0	3,596
24	sec-Butyl alcohol	78-92-2	93	0	3,447
25	Ethylene oxide	75-21-8	483	0	3,183
26	Cobalt compounds	N096	455	36	2,816
27	Ethylbenzene	100-41-4	4	0	2,630
28	n-Butyl alcohol	71-36-3	75	0	2,529
29	Ethylene glycol	107-21-1	3	0	1,147
30	Acetaldehyde	75-07-0	494	0	1,132
31	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	622	1,122
32	Benzene	71-43-2	1,090	0	1,090
33	Chlorine	7782-50-5	961	0	961
34	Cobalt And Cobalt Compounds	N096	82	8	917
35	Formaldehyde	50-00-0	3	0	513
36	Maleic anhydride	108-31-6	0	0	400
37	Methyl methacrylate	80-62-6	387	0	387
38	Cyclohexane	110-82-7	24	0	315
39	Acrylic acid	79-10-7	186	0	192
40	Ethyl chloroformate	541-41-3	120	0	120
41	Styrene	100-42-5	116	0	116
42	Diphenylamine	122-39-4	103	0	103
43	Lead And Lead Compounds	N420	16	1	68
44	Propylene oxide	75-56-9	61	0	61
45	Phosgene	75-44-5	27	0	27
46	Methyl chlorocarbonate	79-22-1	13	0	13