Data-driven insights for local properties

📊 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
4714 HERSCHELL ST HOUSTON 77028
Building Size
1,076 sqft
Total structure area from HCAD building records.
Elevation
39.94 ft
Height above sea level from USGS data.
FEMA Flood Zone
AE
High Risk - 1% annual chance with established base flood elevation
Overall Risk
Moderate
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
Moderate
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)
$0
Property not flooded at current water level. No damage to calculate.
Depth-Damage Estimate (Neighborhood Comparison)
$0
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: 29.94 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.

  • This property is in a high-risk flood zone. Flood insurance is required for mortgages.
  • Consider flood mitigation measures like elevated utilities and flood vents.
  • 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 71% 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)
278 thousand lbs
High
42.6x more than typical Houston property
≈ 14 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)
272 thousand lbs
Very High
56.4x 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)
6 thousand lbs
Very High
Most Houston properties have none nearby
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.

PeriodTotalAirWater
Typical Houston Property (2014-2024)6,524 lbs4,822 lbs0 lbs
This Property (2014-2024)277,650 lbs271,804 lbs5,846 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)101,669 lbs21,761 lbs995 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
6%
70-79th
5.8%
80-89th
4.3%
90-100thLowest Pollution
34.2%
Higher pollution than 71% 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):

Xylene (mixed isomers), n-Butyl alcohol, Zinc compounds, Phenol, Ammonia

View the full list of 35 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (35 chemicals)

#ChemicalCAS#Air (lbs, 10yr)Water (lbs, 10yr)Total (lbs, 10yr)
1Xylene (mixed isomers)1330-20-7140,448 lbs0 lbs140,448 lbs
2n-Butyl alcohol71-36-333,617 lbs0 lbs33,617 lbs
3Zinc compoundsN98222,813 lbs4,977 lbs27,790 lbs
4Phenol108-95-224,642 lbs0 lbs24,642 lbs
5Ammonia7664-41-716,230 lbs0 lbs16,230 lbs
6Ethylbenzene100-41-416,163 lbs0 lbs16,163 lbs
7Styrene100-42-55,373 lbs0 lbs5,373 lbs
8Methyl isobutyl ketone108-10-13,355 lbs0 lbs3,355 lbs
9Toluene108-88-31,871 lbs0 lbs3,044 lbs
10Formaldehyde50-00-01,893 lbs0 lbs1,893 lbs
11Methanol67-56-11,849 lbs0 lbs1,849 lbs
12Methyl tert-butyl ether1634-04-41,021 lbs0 lbs1,021 lbs
13Ethylene glycol107-21-1605 lbs0 lbs605 lbs
14Manganese7439-96-5166 lbs334 lbs501 lbs
151,2,4-Trimethylbenzene95-63-6318 lbs0 lbs318 lbs
16Lead7439-92-1174 lbs66 lbs240 lbs
17Manganese compoundsN45018 lbs208 lbs226 lbs
18Benzene71-43-2218 lbs0 lbs218 lbs
19n-Hexane110-54-3208 lbs0 lbs208 lbs
20Zinc (fume or dust)7440-66-6201 lbs0 lbs201 lbs
21Naphthalene91-20-3194 lbs0 lbs194 lbs
22Chromium compounds (except for chromite ore mined in the Transvaal Region)N090141 lbs15 lbs156 lbs
23DiisocyanatesN120101 lbs4 lbs105 lbs
24Aluminum oxide (fibrous forms)1344-28-11 lbs98 lbs99 lbs
25Barium compounds (except for barium sulfate (CAS No. 7727-43-7))N0400 lbs67 lbs67 lbs
26Copper7440-50-867 lbs0 lbs67 lbs
27Lead compoundsN42038 lbs22 lbs60 lbs
28Nickel7440-02-03 lbs38 lbs41 lbs
29Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)N09032 lbs1 lbs33 lbs
30Aluminum (fume or dust)7429-90-524 lbs0 lbs24 lbs
31Barium And Barium CompoundsN0400 lbs16 lbs16 lbs
32Nitrate compounds (water dissociable; reportable only when in aqueous solution)N51115 lbs0 lbs15 lbs
33Lead And Lead CompoundsN4203 lbs1 lbs3 lbs
34Molybdenum trioxide1313-27-51 lbs0 lbs1 lbs
35Cumene98-82-81 lbs0 lbs1 lbs

Top chemicals released near this property (2024 only):

Zinc compounds, Manganese, Xylene (mixed isomers), Styrene, Nickel

View the full list of 15 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (15 chemicals)

#ChemicalCAS#Air (lbs/yr)Water (lbs/yr)Total (lbs/yr)
1Zinc compoundsN9823,361 lbs739 lbs60,903 lbs
2Manganese7439-96-50 lbs41 lbs19,987 lbs
3Xylene (mixed isomers)1330-20-716,019 lbs0 lbs16,019 lbs
4Styrene100-42-52,239 lbs0 lbs2,239 lbs
5Nickel7440-02-00 lbs31 lbs2,080 lbs
6Methanol67-56-1125 lbs0 lbs125 lbs
7Manganese compoundsN4502 lbs116 lbs118 lbs
8Lead compoundsN4205 lbs3 lbs60 lbs
9Barium compounds (except for barium sulfate (CAS No. 7727-43-7))N0400 lbs19 lbs53 lbs
10Aluminum oxide (fibrous forms)1344-28-10 lbs42 lbs42 lbs
11Molybdenum trioxide1313-27-50 lbs0 lbs21 lbs
12Ethylene glycol107-21-110 lbs0 lbs10 lbs
13Lead7439-92-10 lbs5 lbs5 lbs
14Nickel And Nickel CompoundsN4950 lbs0 lbs5 lbs
15Vanadium (except when contained in an alloy)7440-62-20 lbs0 lbs3 lbs

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