📊 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

4246 APPLEROCK DR BAYTOWN 77521

Building Size

2,597 sqft

Total structure area from HCAD building records.

Elevation

25.21 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: 15.21 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

Moderate

Higher pollution than 66% 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)

141 thousand lbs

High

21.6x more than typical Houston property
≈ 7 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)

141 thousand lbs

High

29.2x 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)

0 lbs

None

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
Typical Houston Property (2014-2024)	6,524 lbs	4,822 lbs
This Property (2014-2024)	140,762 lbs	140,762 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs
This Property (2024 Only)	34,530 lbs	18,730 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 66% of Houston homes

Each bar's width represents the percentage of Houston homes in that pollution range. This property ranks in the 30-39th percentile (higher than average pollution).

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

Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Cyclohexane, Propylene, Styrene, 1,3-Butadiene

View the full list of 13 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (13 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Total (lbs, 10yr)
1	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	71,365 lbs	71,365 lbs
2	Cyclohexane	110-82-7	22,367 lbs	22,367 lbs
3	Propylene	115-07-1	16,018 lbs	16,018 lbs
4	Styrene	100-42-5	11,892 lbs	11,892 lbs
5	1,3-Butadiene	106-99-0	6,901 lbs	6,901 lbs
6	Ammonia	7664-41-7	6,897 lbs	6,897 lbs
7	n-Hexane	110-54-3	2,180 lbs	2,180 lbs
8	Hydrogen sulfide	7783-06-4	1,665 lbs	1,665 lbs
9	Isoprene	78-79-5	1,217 lbs	1,217 lbs
10	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	140 lbs	140 lbs
11	Vanadium compounds	N770	102 lbs	102 lbs
12	Carbon disulfide	75-15-0	14 lbs	14 lbs
13	Lead	7439-92-1	1 lbs	1 lbs

Top chemicals released near this property (2024 only):

Vanadium compounds, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Cyclohexane, Isoprene, Styrene

View the full list of 10 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (10 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Total (lbs/yr)
1	Vanadium compounds	N770	1 lbs	15,801 lbs
2	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	12,133 lbs	12,133 lbs
3	Cyclohexane	110-82-7	2,974 lbs	2,974 lbs
4	Isoprene	78-79-5	1,197 lbs	1,197 lbs
5	Styrene	100-42-5	865 lbs	865 lbs
6	Propylene	115-07-1	464 lbs	464 lbs
7	Ammonia	7664-41-7	447 lbs	447 lbs
8	n-Hexane	110-54-3	328 lbs	328 lbs
9	Hydrogen sulfide	7783-06-4	296 lbs	296 lbs
10	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	25 lbs	25 lbs