Data-driven insights for local properties

Complete Property Analysis

Environmental risk, tax analysis, and property details for 727 Old Underwood Rd, La Porte, TX 77571

HCAD #0642220000055
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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
727 Old Underwood Rd, La Porte, TX 77571
Elevation
31.34 ft
Height above sea level from USGS data.
FEMA Flood Zone
X
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
38.5 acres
13.0% of 500m radius flooded.
Nearest Bayou Stage
N/A
No nearby bayou within monitoring range
Depth-Damage (HCAD Valuation)
$0
Vacant lot (no building data).
Depth-Damage (Neighborhood)
$0
Vacant lot (no building data).
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 Safe
Safety Margin: 0 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.

#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
7.6th percentile
Property Pollution Ranking
Very High
Higher pollution than 92% of Houston homes
Compares pollution within 2mi against 10,000 Houston properties. Lower percentiles = higher pollution.
Industrial Pollution Nearby (10 Years)
14.4 millionlbs
Extremely High
2207.0x more than typical Houston property
≈ 720 dump trucks of chemicals within 2 miles
Air Pollution (10 Years)
7.57 millionlbs
Extremely High
1570.3x more than typical Houston property
Includes fugitive emissions (leaks) and stack emissions (smokestacks).
Water Pollution (10 Years)
6.83 millionlbs
Extremely High
Discharges to bayous, streams, and drainage systems.
Facilities Nearby
19
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)14,398,937 lbs7,572,459 lbs6,826,478 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)1,769,949 lbs710,193 lbs672,634 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 92% of Houston homes
Each bar's width represents the percentage of Houston homes in that pollution range. This property ranks in the 0-9th percentile (top 10% most polluted).
📋
Top chemicals released near this property (past 10 years):
Nitrate compounds (water dissociable; reportable only when in aqueous solution), Ethylene, Propylene, Methanol, Vinyl acetate
View the full list of 42 chemicals below.
Chemicals Released (2014-2024, 10-Year Total)(42 chemicals)
#ChemicalCAS#Air (lbs/10yr)Water (lbs/10yr)Total (lbs/10yr)
1Nitrate compounds (water dissociable; reportable only when in aqueous solution)N5110 lbs6,134,896 lbs6,134,896 lbs
2Ethylene74-85-12,952,505 lbs0 lbs2,952,505 lbs
3Propylene115-07-11,745,107 lbs0 lbs1,745,107 lbs
4Methanol67-56-1480,229 lbs653,326 lbs1,133,555 lbs
5Vinyl acetate108-05-41,056,100 lbs5,684 lbs1,061,784 lbs
6Ammonia7664-41-7341,774 lbs9,444 lbs772,697 lbs
7n-Hexane110-54-3585,056 lbs0 lbs585,056 lbs
8Certain glycol ethersN23063,696 lbs0 lbs63,696 lbs
91,3-Butadiene106-99-050,362 lbs0 lbs50,362 lbs
10Xylene (mixed isomers)1330-20-743,144 lbs0 lbs43,144 lbs
11Methyl iodide74-88-437,993 lbs0 lbs37,993 lbs
12Chlorine7782-50-532,625 lbs3,421 lbs36,046 lbs
13Acetaldehyde75-07-026,651 lbs0 lbs26,651 lbs
14Zinc compoundsN9826,213 lbs19,557 lbs25,770 lbs
15Benzene71-43-219,821 lbs42 lbs19,863 lbs
16Ethylene glycol107-21-116,751 lbs0 lbs16,751 lbs
17Formaldehyde50-00-016,402 lbs0 lbs16,402 lbs
18Chlorobenzene108-90-716,036 lbs0 lbs16,036 lbs
19Cyclohexane110-82-714,194 lbs0 lbs14,194 lbs
20Boron trifluoride7637-07-214,190 lbs0 lbs14,190 lbs
21Chloroethane75-00-313,375 lbs0 lbs13,375 lbs
22Toluene108-88-39,250 lbs33 lbs9,282 lbs
23N,N-Dimethylformamide68-12-29,020 lbs0 lbs9,020 lbs
24Isoprene78-79-55,909 lbs0 lbs5,909 lbs
25Maleic anhydride108-31-65,569 lbs0 lbs5,569 lbs
26DiisocyanatesN1204,276 lbs0 lbs4,276 lbs
27Di(2-ethylhexyl) phthalate117-81-72,020 lbs0 lbs2,020 lbs
28Styrene100-42-51,209 lbs0 lbs1,209 lbs
29Hydrogen cyanide74-90-8596 lbs0 lbs596 lbs
30Naphthalene91-20-3493 lbs33 lbs526 lbs
31Aluminum (fume or dust)7429-90-5462 lbs0 lbs462 lbs
32Ethylbenzene100-41-4391 lbs32 lbs423 lbs
33Chloromethane74-87-3326 lbs0 lbs326 lbs
34Dicyclopentadiene77-73-6290 lbs0 lbs290 lbs
35Nitric acid7697-37-2260 lbs0 lbs260 lbs
36n-Butyl alcohol71-36-387 lbs0 lbs87 lbs
37sec-Butyl alcohol78-92-268 lbs0 lbs68 lbs
38Lead7439-92-10 lbs10 lbs10 lbs
39Polycyclic aromatic compoundsN5907 lbs0 lbs7 lbs
40Mercury compoundsN4582 lbs0 lbs2 lbs
41Benzo[g,h,i]perylene191-24-20 lbs1 lbs1 lbs
42Mercury And Mercury CompoundsN4581 lbs0 lbs1 lbs
📋
Top chemicals released near this property (2024 only):
Nitrate compounds (water dissociable; reportable only when in aqueous solution), Ammonia, Ethylene, Propylene, Methanol
View the full list of 36 chemicals reported within 2 miles for 2024.
Chemicals Released (2024 Only)(36 chemicals)
#ChemicalCAS#Air (lbs/yr)Water (lbs/yr)Total (lbs/yr)
1Nitrate compounds (water dissociable; reportable only when in aqueous solution)N5110 lbs607,579 lbs607,579 lbs
2Ammonia7664-41-749,914 lbs371 lbs437,407 lbs
3Ethylene74-85-1294,016 lbs0 lbs294,016 lbs
4Propylene115-07-1167,759 lbs0 lbs167,759 lbs
5Methanol67-56-125,400 lbs64,010 lbs89,410 lbs
6Vinyl acetate108-05-481,700 lbs410 lbs82,110 lbs
7n-Hexane110-54-361,453 lbs0 lbs61,453 lbs
8Chlorine7782-50-53,500 lbs0 lbs3,500 lbs
9Formaldehyde50-00-03,363 lbs0 lbs3,363 lbs
10Certain glycol ethersN2303,026 lbs0 lbs3,026 lbs
111,3-Butadiene106-99-02,958 lbs0 lbs2,958 lbs
12Toluene108-88-31,859 lbs3 lbs1,862 lbs
13DiisocyanatesN1201,843 lbs0 lbs1,843 lbs
14Benzene71-43-21,725 lbs3 lbs1,728 lbs
15Cyclohexane110-82-71,726 lbs0 lbs1,726 lbs
16Methyl iodide74-88-41,600 lbs0 lbs1,600 lbs
17Maleic anhydride108-31-61,569 lbs0 lbs1,569 lbs
18Chloroethane75-00-31,429 lbs0 lbs1,429 lbs
19Boron trifluoride7637-07-21,192 lbs0 lbs1,192 lbs
20Xylene (mixed isomers)1330-20-71,144 lbs0 lbs1,144 lbs
21Zinc compoundsN982426 lbs233 lbs659 lbs
22Acetaldehyde75-07-0580 lbs0 lbs580 lbs
23Isoprene78-79-5578 lbs0 lbs578 lbs
24N,N-Dimethylformamide68-12-2570 lbs0 lbs570 lbs
25Ethylbenzene100-41-4358 lbs2 lbs360 lbs
26Naphthalene91-20-3270 lbs18 lbs288 lbs
27Styrene100-42-5141 lbs0 lbs141 lbs
28Dicyclopentadiene77-73-630 lbs0 lbs30 lbs
29Aluminum (fume or dust)7429-90-526 lbs0 lbs26 lbs
30Nitric acid7697-37-220 lbs0 lbs20 lbs
31n-Butyl alcohol71-36-37 lbs0 lbs7 lbs
32Lead7439-92-10 lbs5 lbs5 lbs
33sec-Butyl alcohol78-92-25 lbs0 lbs5 lbs
34Polycyclic aromatic compoundsN5903 lbs0 lbs3 lbs
35Ethylene glycol107-21-11 lbs0 lbs1 lbs
36Mercury And Mercury CompoundsN4581 lbs0 lbs1 lbs
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