Home > Analysis: 3818 Roseway Ln, La Porte, TX 77571 06/18/2025

📊 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

3818 ROSEWAY LN LA PORTE 77571

Building Size

1,856 sqft

Total structure area from HCAD building records.

Elevation

19.11 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: 9.11 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 88% 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)

4.13 million lbs

Extremely High

633.7x more than typical Houston property
≈ 207 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)

4.11 million lbs

Extremely High

852.6x 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)

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)	4,134,568 lbs	4,111,546 lbs	16,336 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	2,031,780 lbs	354,577 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 88% 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, Toluene, Ammonia, Nitric acid

View the full list of 60 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (60 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	746,027	0	746,027
3	Toluene	108-88-3	434,759	0	434,759
4	Ammonia	7664-41-7	417,580	123	417,723
5	Nitric acid	7697-37-2	397,668	55	397,748
6	Methanol	67-56-1	259,441	0	265,968
7	Ethylene glycol	107-21-1	104,863	0	104,863
8	Ethylene oxide	75-21-8	98,927	0	98,927
9	Acrylonitrile	107-13-1	83,639	0	83,639
10	n-Butyl alcohol	71-36-3	67,098	0	67,098
11	Certain glycol ethers	N230	46,549	0	46,550
12	Hydroquinone	123-31-9	42,495	0	42,495
13	Molybdenum trioxide	1313-27-5	37,655	3,227	40,897
14	Acetaldehyde	75-07-0	37,584	0	37,584
15	Propylene	115-07-1	36,801	0	36,801
16	Methyl isobutyl ketone	108-10-1	36,313	0	36,313
17	Hydrogen sulfide	7783-06-4	31,678	0	31,678
18	Cumene	98-82-8	31,173	0	31,173
19	Phenol	108-95-2	30,497	0	30,497
20	Vinyl acetate	108-05-4	22,306	0	22,306
21	Xylene (mixed isomers)	1330-20-7	17,096	0	17,096
22	Nickel compounds	N495	11,795	1,904	13,714
23	Styrene	100-42-5	12,385	0	12,385
24	2-Methoxyethanol	109-86-4	11,669	0	11,669
25	Benzene	71-43-2	10,536	0	10,536
26	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	30	9,885	9,930
27	Chloroethane	75-00-3	9,070	0	9,070
28	Cobalt compounds	N096	5,871	886	6,772
29	2-Ethoxyethanol	110-80-5	6,044	0	6,044
30	Diphenylamine	122-39-4	5,938	0	5,938
31	tert-Butyl alcohol	75-65-0	5,606	0	5,606
32	Ethylbenzene	100-41-4	5,307	0	5,307
33	Nickel And Nickel Compounds	N495	4,878	62	4,940
34	Cobalt And Cobalt Compounds	N096	4,551	42	4,593
35	Dimethylamine	124-40-3	3,754	0	3,754
36	Formaldehyde	50-00-0	2,738	102	2,840
37	Propylene oxide	75-56-9	1,981	0	1,981
38	Maleic anhydride	108-31-6	1,577	0	1,577
39	Allyl alcohol	107-18-6	1,569	0	1,569
40	1,2,4-Trimethylbenzene	95-63-6	1,065	0	1,065
41	Nonylphenol	N530	1,013	0	1,013
42	Nonylphenol Ethoxylates	N535	1,008	0	1,008
43	Cyclohexane	110-82-7	857	0	857
44	Benzoyl chloride	98-88-4	469	0	469
45	Hydrazine	302-01-2	437	0	437
46	Lead And Lead Compounds	N420	211	10	221
47	Barium compounds (except for barium sulfate (CAS No. 7727-43-7))	N040	145	30	175
48	Bifenthrin	82657-04-3	149	0	149
49	Lead compounds	N420	138	4	142
50	Copper compounds	N100	132	6	138
51	Naphthalene	91-20-3	96	0	96
52	Cyanide compounds	N106	5	0	58
53	Chloromethane	74-87-3	51	0	51
54	Oxyfluorfen	42874-03-3	10	0	10
55	Zinc compounds	N982	5	0	5
56	Bis(2-chloroethyl) ether	111-44-4	3	0	3
57	Cumene hydroperoxide	80-15-9	2	0	2
58	Methyl methacrylate	80-62-6	2	0	2
59	Nickel	7440-02-0	2	0	2
60	Boron trifluoride	7637-07-2	1	0	1

Top chemicals released near this property (2024 only):

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

View the full list of 51 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (51 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Methanol	67-56-1	16,250	0	953,017
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	Dimethylamine	124-40-3	341	0	92,098
7	Ethylene	74-85-1	90,976	0	90,976
8	Molybdenum trioxide	1313-27-5	2,770	482	79,984
9	Diphenylamine	122-39-4	105	0	48,731
10	Ammonia	7664-41-7	46,286	5	47,885
11	1,2,4-Trimethylbenzene	95-63-6	99	0	44,035
12	Toluene	108-88-3	14,342	0	42,732
13	Copper	7440-50-8	0	0	27,230
14	Ethylene oxide	75-21-8	7,605	0	16,153
15	Xylene (mixed isomers)	1330-20-7	635	0	13,936
16	Certain glycol ethers	N230	3,460	0	13,228
17	Nickel And Nickel Compounds	N495	82	8	12,690
18	Propylene	115-07-1	10,035	0	10,035
19	Chloroethane	75-00-3	3,424	0	9,649
20	Nitric acid	7697-37-2	9,490	5	9,500
21	Nickel compounds	N495	1,017	108	7,851
22	Vinyl acetate	108-05-4	2,418	0	7,117
23	Phenol	108-95-2	1,875	0	6,506
24	n-Butyl alcohol	71-36-3	2,203	0	5,477
25	Cumene	98-82-8	2,616	0	5,324
26	Hydroquinone	123-31-9	4,862	0	4,862
27	Naphthalene	91-20-3	12	0	4,436
28	Methyl isobutyl ketone	108-10-1	3,997	0	3,997
29	Hydrogen sulfide	7783-06-4	3,596	0	3,596
30	Ethylbenzene	100-41-4	275	0	2,926
31	Cobalt compounds	N096	455	36	2,816
32	Acetaldehyde	75-07-0	869	0	2,167
33	Styrene	100-42-5	374	0	2,108
34	Cumene hydroperoxide	80-15-9	0	0	1,560
35	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	622	1,122
36	Benzene	71-43-2	1,090	0	1,090
37	2-Methoxyethanol	109-86-4	1,027	0	1,045
38	Cobalt And Cobalt Compounds	N096	82	8	917
39	Formaldehyde	50-00-0	154	0	667
40	Maleic anhydride	108-31-6	186	0	592
41	2-Ethoxyethanol	110-80-5	407	0	429
42	Dimethyl phthalate	131-11-3	0	0	406
43	Cyclohexane	110-82-7	24	0	315
44	Nonylphenol	N530	1	0	224
45	Propylene oxide	75-56-9	39	0	203
46	Lead And Lead Compounds	N420	16	1	68
47	Hydrazine	302-01-2	39	0	39
48	Benzoyl chloride	98-88-4	33	0	33
49	Acrylonitrile	107-13-1	0	0	4
50	Methyl methacrylate	80-62-6	0	0	4
51	Aniline	62-53-3	0	0	2