Data-driven insights for local properties

Complete Property Analysis

Environmental risk, tax analysis, and property details for 621 N 11th St, La Porte, TX 77571

HCAD #0240420380027
🧭Jump to Section
🌍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 AE
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
621 N 11th St, La Porte, TX 77571
Building Size
1,275sqft
Total structure area from HCAD building records.
Elevation
18.85 ft
Height above sea level from USGS data.
FEMA Flood Zone
AE
High Risk - 1% annual chance with established base flood elevation
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)
28.69 ft
Water surface elevation relative to sea level (NAVD88 datum).
Area Inundated
276.9 acres
93.9% of 500m radius flooded.
Nearest Bayou Stage
N/A
No nearby bayou within monitoring range
Depth-Damage (HCAD Valuation)
$69,175
Based on HCAD building value of $106,424.
Depth-Damage (Neighborhood)
$62,487
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
Special Flood Hazard Area (SFHA): Flood insurance required for federally backed mortgages
#2
Obtain an Elevation Certificate to determine accurate flood insurance premiums
#3
Property elevation currently above simulated flood level
#4
Maintain flood insurance coverage as required in Special Flood Hazard Areas
#5
Review official FEMA Flood Insurance Rate Map (FIRM) for detailed flood zone boundaries
#6
Contact Harris County Flood Control District (HCFCD) for drainage projects and flood information
🏭Industrial Pollution Exposure
15.5th percentile
Property Pollution Ranking
High
Higher pollution than 85% of Houston homes
Compares pollution within 2mi against 10,000 Houston properties. Lower percentiles = higher pollution.
Industrial Pollution Nearby (10 Years)
2.04 millionlbs
Extremely High
312.2x more than typical Houston property
≈ 102 dump trucks of chemicals within 2 miles
Air Pollution (10 Years)
1.1 millionlbs
Extremely High
227.1x more than typical Houston property
Includes fugitive emissions (leaks) and stack emissions (smokestacks).
Water Pollution (10 Years)
942 thousandlbs
Extremely High
Discharges to bayous, streams, and drainage systems.
Facilities Nearby
16
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)2,036,746 lbs1,095,088 lbs941,658 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)59,138 lbs59,138 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 85% 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 chemicals released near this property (past 10 years):
Nitrate compounds (water dissociable; reportable only when in aqueous solution), Methanol, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Vinyl acetate, Ammonia
View the full list of 48 chemicals below.
Chemicals Released (2014-2024, 10-Year Total)(48 chemicals)
#ChemicalCAS#Air (lbs/10yr)Water (lbs/10yr)Total (lbs/10yr)
1Nitrate compounds (water dissociable; reportable only when in aqueous solution)N5110 lbs911,682 lbs911,682 lbs
2Methanol67-56-1406,654 lbs0 lbs665,654 lbs
3Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7664-93-9216,585 lbs0 lbs216,585 lbs
4Vinyl acetate108-05-416,765 lbs0 lbs154,375 lbs
5Ammonia7664-41-7104,768 lbs3,199 lbs107,967 lbs
6Formaldehyde50-00-063,808 lbs0 lbs63,808 lbs
7n-Butyl alcohol71-36-349,206 lbs0 lbs49,206 lbs
8Toluene108-88-346,261 lbs0 lbs46,261 lbs
9Ethylene74-85-133,894 lbs0 lbs33,894 lbs
10Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7647-01-033,058 lbs0 lbs33,058 lbs
11Copper compoundsN1001 lbs84 lbs29,084 lbs
12Sodium nitrite7632-00-00 lbs26,012 lbs26,012 lbs
13Xylene (mixed isomers)1330-20-711,137 lbs0 lbs25,482 lbs
14Hydrogen fluoride7664-39-319,001 lbs0 lbs19,001 lbs
15n-Hexane110-54-316,824 lbs0 lbs16,824 lbs
16Hydroquinone123-31-90 lbs0 lbs14,940 lbs
17Propylene115-07-113,154 lbs0 lbs13,154 lbs
18Chlorine7782-50-511,961 lbs0 lbs11,961 lbs
19Acetaldehyde75-07-03,787 lbs0 lbs10,017 lbs
20Acetonitrile75-05-87,091 lbs0 lbs7,091 lbs
21Dimethylamine124-40-37,035 lbs0 lbs7,035 lbs
22Dichloromethane75-09-25,688 lbs0 lbs5,688 lbs
23Chloroacetic acid79-11-84,175 lbs0 lbs4,175 lbs
24Acrylic acid79-10-73,532 lbs0 lbs3,532 lbs
25Methyl methacrylate80-62-63,435 lbs0 lbs3,435 lbs
26Chlorobenzene108-90-73,127 lbs0 lbs3,127 lbs
27Mercury7439-97-60 lbs0 lbs2,200 lbs
28Phosgene75-44-51,958 lbs0 lbs1,958 lbs
29Aluminum oxide (fibrous forms)1344-28-11,750 lbs0 lbs1,750 lbs
30Methyl tert-butyl ether1634-04-41,591 lbs0 lbs1,591 lbs
31Triethylamine121-44-81,515 lbs0 lbs1,515 lbs
32Ethyl chloroformate541-41-31,467 lbs0 lbs1,467 lbs
33Methyl chlorocarbonate79-22-11,449 lbs0 lbs1,449 lbs
34sec-Butyl alcohol78-92-21,434 lbs0 lbs1,434 lbs
35Ethylene oxide75-21-81,431 lbs0 lbs1,431 lbs
36Manganese7439-96-5511 lbs282 lbs793 lbs
37N,N-Dimethylformamide68-12-2535 lbs0 lbs535 lbs
38Propylene oxide75-56-9371 lbs0 lbs371 lbs
39Hexazinone51235-04-20 lbs212 lbs212 lbs
40Nickel7440-02-00 lbs152 lbs152 lbs
41Chromium7440-47-345 lbs25 lbs70 lbs
42Methyl acrylate96-33-355 lbs0 lbs55 lbs
43Ethylene glycol107-21-114 lbs0 lbs14 lbs
44Nickel compoundsN4954 lbs3 lbs8 lbs
45Copper And Copper CompoundsN1000 lbs6 lbs6 lbs
46Butyl acrylate141-32-25 lbs0 lbs5 lbs
47Nickel And Nickel CompoundsN4952 lbs1 lbs3 lbs
48Methyl isocyanate624-83-91 lbs0 lbs1 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), Ammonia, Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Methanol, Formaldehyde
View the full list of 21 chemicals reported within 2 miles for 2024.
Chemicals Released (2024 Only)(21 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
2Ammonia7664-41-77,795 lbs0 lbs7,795 lbs
3Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7647-01-06,255 lbs0 lbs6,255 lbs
4Methanol67-56-15,864 lbs0 lbs5,864 lbs
5Formaldehyde50-00-03,559 lbs0 lbs3,559 lbs
6Hydrogen fluoride7664-39-31,738 lbs0 lbs1,738 lbs
7Chlorine7782-50-51,121 lbs0 lbs1,121 lbs
8Ethylene74-85-1650 lbs0 lbs650 lbs
9Propylene115-07-1500 lbs0 lbs500 lbs
10Chloroacetic acid79-11-8476 lbs0 lbs476 lbs
11Ethylene oxide75-21-8420 lbs0 lbs420 lbs
12Methyl methacrylate80-62-6387 lbs0 lbs387 lbs
13Aluminum oxide (fibrous forms)1344-28-1250 lbs0 lbs250 lbs
14Acrylic acid79-10-7186 lbs0 lbs186 lbs
15Ethyl chloroformate541-41-3120 lbs0 lbs120 lbs
16sec-Butyl alcohol78-92-293 lbs0 lbs93 lbs
17n-Butyl alcohol71-36-375 lbs0 lbs75 lbs
18Propylene oxide75-56-960 lbs0 lbs60 lbs
19Phosgene75-44-527 lbs0 lbs27 lbs
20Methyl chlorocarbonate79-22-113 lbs0 lbs13 lbs
21Ethylene glycol107-21-13 lbs0 lbs3 lbs
Loading property data...
🏘️Explore More Properties