Data-driven insights for local properties

Complete Property Analysis

Environmental risk, tax analysis, and property details for 421 N 4th St, La Porte, TX 77571

HCAD #0232080890027
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🌍Environmental Assessment

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.

🌊Flood Risk Analysis
FEMA Zone X
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
421 N 4th St, La Porte, TX 77571
Building Size
1,378sqft
Total structure area from HCAD building records.
Elevation
20.02 ft
Height above sea level from USGS data.
FEMA Flood Zone
X
Moderate to Low Risk - Outside 500-year floodplain
Overall Risk
Very High
Property flooded at 9.84ft depth.
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 High
Flood Depth
9.84 ft±0.5 ft
Depth of water above ground level.
Water Surface Elevation (WSE)
29.86 ft
Water surface elevation relative to sea level (NAVD88 datum).
Area Inundated
285.3 acres
96.8% of 500m radius flooded.
Nearest Bayou Stage
N/A
No nearby bayou within monitoring range
Depth-Damage (HCAD Valuation)
$93,230
Based on HCAD building value of $143,431.
Depth-Damage (Neighborhood)
$80,451
Based on neighborhood replacement cost.
Analysis Method
COG Combined 5000 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 Flooded
Flood Depth: 9.84 feet
Severity
Severe
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.

#1
Minimal flood hazard area - property outside mapped high-risk zones
#2
Flood insurance available at preferred rates - over 25% of claims occur in low-risk areas
#3
Review official FEMA Flood Insurance Rate Map (FIRM) for detailed flood zone boundaries
#4
Contact Harris County Flood Control District (HCFCD) for drainage projects and flood information
🏭Industrial Pollution Exposure
21.0th percentile
Property Pollution Ranking
High
Higher pollution than 79% of Houston homes
Compares pollution within 2mi against 10,000 Houston properties. Lower percentiles = higher pollution.
Industrial Pollution Nearby (10 Years)
737 thousandlbs
Extremely High
113.0x more than typical Houston property
≈ 37 dump trucks of chemicals within 2 miles
Air Pollution (10 Years)
737 thousandlbs
Extremely High
152.9x more than typical Houston property
Includes fugitive emissions (leaks) and stack emissions (smokestacks).
Water Pollution (10 Years)
94lbs
Above Typical
Discharges to bayous, streams, and drainage systems.
Facilities Nearby
12
Industrial facilities within 2 miles
💡
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)737,477 lbs737,383 lbs94 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)49,513 lbs49,513 lbs0 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 79% 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 chemicals released near this property (past 10 years):
Methanol, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Formaldehyde, n-Butyl alcohol, Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)
View the full list of 29 chemicals below.
Chemicals Released (2014-2024, 10-Year Total)(29 chemicals)
#ChemicalCAS#Air (lbs/10yr)Water (lbs/10yr)Total (lbs/10yr)
1Methanol67-56-1292,178 lbs0 lbs292,178 lbs
2Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7664-93-9216,585 lbs0 lbs216,585 lbs
3Formaldehyde50-00-063,808 lbs0 lbs63,808 lbs
4n-Butyl alcohol71-36-349,206 lbs0 lbs49,206 lbs
5Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7647-01-033,058 lbs0 lbs33,058 lbs
6Copper compoundsN1001 lbs84 lbs29,084 lbs
7Hydrogen fluoride7664-39-317,939 lbs0 lbs17,939 lbs
8Propylene115-07-113,154 lbs0 lbs13,154 lbs
9Chlorine7782-50-511,230 lbs0 lbs11,230 lbs
10Xylene (mixed isomers)1330-20-710,381 lbs0 lbs10,381 lbs
11Ethylene74-85-17,000 lbs0 lbs7,000 lbs
12Chloroacetic acid79-11-84,175 lbs0 lbs4,175 lbs
13Chlorobenzene108-90-73,127 lbs0 lbs3,127 lbs
14Phosgene75-44-51,958 lbs0 lbs1,958 lbs
15Acetonitrile75-05-81,765 lbs0 lbs1,765 lbs
16Aluminum oxide (fibrous forms)1344-28-11,750 lbs0 lbs1,750 lbs
17Methyl tert-butyl ether1634-04-41,591 lbs0 lbs1,591 lbs
18Triethylamine121-44-81,515 lbs0 lbs1,515 lbs
19Ethyl chloroformate541-41-31,467 lbs0 lbs1,467 lbs
20Methyl chlorocarbonate79-22-11,449 lbs0 lbs1,449 lbs
21sec-Butyl alcohol78-92-21,434 lbs0 lbs1,434 lbs
22Toluene108-88-31,261 lbs0 lbs1,261 lbs
23N,N-Dimethylformamide68-12-2535 lbs0 lbs535 lbs
24Manganese7439-96-5511 lbs0 lbs511 lbs
25Dichloromethane75-09-2251 lbs0 lbs251 lbs
26Chromium7440-47-345 lbs0 lbs45 lbs
27Nickel compoundsN4954 lbs3 lbs8 lbs
28Copper And Copper CompoundsN1000 lbs6 lbs6 lbs
29Nickel And Nickel CompoundsN4952 lbs1 lbs3 lbs
📋
Top chemicals released near this property (2024 only):
Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Methanol, Formaldehyde, Hydrogen fluoride
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)
1Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7664-93-929,545 lbs0 lbs29,545 lbs
2Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7647-01-06,255 lbs0 lbs6,255 lbs
3Methanol67-56-15,090 lbs0 lbs5,090 lbs
4Formaldehyde50-00-03,559 lbs0 lbs3,559 lbs
5Hydrogen fluoride7664-39-31,738 lbs0 lbs1,738 lbs
6Chlorine7782-50-51,121 lbs0 lbs1,121 lbs
7Ethylene74-85-1650 lbs0 lbs650 lbs
8Propylene115-07-1500 lbs0 lbs500 lbs
9Chloroacetic acid79-11-8476 lbs0 lbs476 lbs
10Aluminum oxide (fibrous forms)1344-28-1250 lbs0 lbs250 lbs
11Ethyl chloroformate541-41-3120 lbs0 lbs120 lbs
12sec-Butyl alcohol78-92-293 lbs0 lbs93 lbs
13n-Butyl alcohol71-36-375 lbs0 lbs75 lbs
14Phosgene75-44-527 lbs0 lbs27 lbs
15Methyl chlorocarbonate79-22-113 lbs0 lbs13 lbs
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