Home > Analysis: 501 Valley Brook Dr, La Porte, TX 77571 01/04/2025

📊 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

501 VALLEY BROOK DR LA PORTE 77571

Building Size

2,646 sqft

Total structure area from HCAD building records.

Elevation

19.28 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: 9.28 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 80% 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)

855 thousand lbs

Extremely High

131.0x more than typical Houston property
≈ 43 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)

843 thousand lbs

Extremely High

174.9x 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)

11 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)	854,612 lbs	843,381 lbs	11,125 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	340,319 lbs	55,553 lbs	657 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 80% of Houston homes

Each bar's width represents the percentage of Houston homes in that pollution range. This property ranks in the 20-29th percentile (top 25% most polluted).

Top chemicals released near this property (past 10 years):

Ammonia, Nitric acid, Molybdenum trioxide, Nitrate compounds (water dissociable; reportable only when in aqueous solution), Cobalt And Cobalt Compounds

View the full list of 29 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (29 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	Ammonia	7664-41-7	413,789	123	413,932
2	Nitric acid	7697-37-2	397,602	55	397,682
3	Molybdenum trioxide	1313-27-5	10,410	62	10,487
4	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	30	9,885	9,930
5	Cobalt And Cobalt Compounds	N096	4,251	37	4,288
6	Nickel And Nickel Compounds	N495	4,176	41	4,217
7	Methanol	67-56-1	3,226	0	3,226
8	Nickel compounds	N495	1,910	756	2,681
9	Cobalt compounds	N096	1,910	20	1,945
10	Certain glycol ethers	N230	1,449	0	1,450
11	1,2,4-Trimethylbenzene	95-63-6	971	0	971
12	Xylene (mixed isomers)	1330-20-7	874	0	874
13	Toluene	108-88-3	807	0	807
14	Ethylene oxide	75-21-8	791	0	791
15	Cyclohexane	110-82-7	377	0	377
16	Lead And Lead Compounds	N420	211	10	221
17	Barium compounds (except for barium sulfate (CAS No. 7727-43-7))	N040	145	30	175
18	Formaldehyde	50-00-0	46	102	148
19	Lead compounds	N420	138	4	142
20	Ethylbenzene	100-41-4	94	0	94
21	Cumene	98-82-8	68	0	68
22	Chloromethane	74-87-3	51	0	51
23	Naphthalene	91-20-3	33	0	33
24	Propylene oxide	75-56-9	14	0	14
25	Bis(2-chloroethyl) ether	111-44-4	3	0	3
26	Methyl methacrylate	80-62-6	2	0	2
27	Maleic anhydride	108-31-6	1	0	1
28	Ethylene glycol	107-21-1	1	0	1
29	n-Butyl alcohol	71-36-3	1	0	1

Top chemicals released near this property (2024 only):

Methanol, Ammonia, Molybdenum trioxide, 1,2,4-Trimethylbenzene, Copper

View the full list of 26 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (26 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Methanol	67-56-1	139	0	95,716
2	Ammonia	7664-41-7	45,360	5	46,960
3	Molybdenum trioxide	1313-27-5	158	8	46,708
4	1,2,4-Trimethylbenzene	95-63-6	74	0	44,010
5	Copper	7440-50-8	0	0	27,230
6	Toluene	108-88-3	16	0	14,037
7	Xylene (mixed isomers)	1330-20-7	39	0	13,258
8	Nickel And Nickel Compounds	N495	82	8	12,690
9	Nonylphenol Ethoxylates	N535	0	0	11,809
10	Nitric acid	7697-37-2	9,488	5	9,498
11	Naphthalene	91-20-3	0	0	4,065
12	Ethylene oxide	75-21-8	63	0	2,763
13	Cumene	98-82-8	4	0	2,713
14	Ethylbenzene	100-41-4	4	0	2,643
15	Styrene	100-42-5	0	0	1,734
16	Ethylene glycol	107-21-1	0	0	1,138
17	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	622	1,122
18	Cobalt And Cobalt Compounds	N096	82	8	917
19	Formaldehyde	50-00-0	3	0	513
20	Maleic anhydride	108-31-6	0	0	400
21	Cyclohexane	110-82-7	24	0	315
22	Lead And Lead Compounds	N420	16	1	68
23	Methyl methacrylate	80-62-6	0	0	4
24	Acrylonitrile	107-13-1	0	0	4
25	Aniline	62-53-3	0	0	2
26	Propylene oxide	75-56-9	1	0	1