Data-driven insights for local properties

Complete Property Analysis

Environmental risk, tax analysis, and property details for 704 Old Underwood Rd, La Porte, TX 77571

HCAD #0231440000629
🧭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 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
704 Old Underwood Rd, La Porte, TX 77571
Elevation
33.91 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
118.3 acres
40.1% 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
7.8th 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)
13.88 millionlbs
Extremely High
2127.8x more than typical Houston property
≈ 694 dump trucks of chemicals within 2 miles
Air Pollution (10 Years)
7.29 millionlbs
Extremely High
1510.8x more than typical Houston property
Includes fugitive emissions (leaks) and stack emissions (smokestacks).
Water Pollution (10 Years)
6.6 millionlbs
Extremely High
Discharges to bayous, streams, and drainage systems.
Facilities Nearby
18
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)13,882,401 lbs7,285,391 lbs6,597,010 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)1,770,081 lbs710,325 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, Vinyl acetate, Ammonia
View the full list of 53 chemicals below.
Chemicals Released (2014-2024, 10-Year Total)(53 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
2Ethylene74-85-12,951,185 lbs0 lbs2,951,185 lbs
3Propylene115-07-11,717,563 lbs0 lbs1,717,563 lbs
4Vinyl acetate108-05-41,056,100 lbs5,684 lbs1,061,784 lbs
5Ammonia7664-41-7338,634 lbs9,444 lbs769,557 lbs
6Methanol67-56-1235,706 lbs424,618 lbs660,324 lbs
7n-Hexane110-54-3581,056 lbs0 lbs581,056 lbs
8Certain glycol ethersN23064,069 lbs0 lbs64,069 lbs
91,3-Butadiene106-99-050,145 lbs0 lbs50,145 lbs
10Xylene (mixed isomers)1330-20-743,150 lbs0 lbs43,150 lbs
11Methyl iodide74-88-437,993 lbs0 lbs37,993 lbs
12Chlorine7782-50-525,003 lbs2,816 lbs27,819 lbs
13Acetaldehyde75-07-026,651 lbs0 lbs26,651 lbs
14Zinc compoundsN9826,608 lbs19,402 lbs26,010 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
26DiisocyanatesN1204,282 lbs0 lbs4,282 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
33Acrylic acid79-10-7348 lbs0 lbs348 lbs
34Chloromethane74-87-3326 lbs0 lbs326 lbs
35Dicyclopentadiene77-73-6290 lbs0 lbs290 lbs
36Nitric acid7697-37-2260 lbs0 lbs260 lbs
37Diethanolamine111-42-257 lbs0 lbs57 lbs
38Methyl acrylate96-33-347 lbs0 lbs47 lbs
39Ethyl acrylate140-88-535 lbs0 lbs35 lbs
40Triethylamine121-44-834 lbs0 lbs34 lbs
41n-Butyl alcohol71-36-328 lbs0 lbs28 lbs
42Butyl acrylate141-32-228 lbs0 lbs28 lbs
43Manganese compoundsN45026 lbs0 lbs26 lbs
44Methyl methacrylate80-62-625 lbs0 lbs25 lbs
45sec-Butyl alcohol78-92-221 lbs0 lbs21 lbs
46Diphenylamine122-39-410 lbs0 lbs10 lbs
471,2,4-Trimethylbenzene95-63-610 lbs0 lbs10 lbs
48Lead7439-92-10 lbs10 lbs10 lbs
49Polycyclic aromatic compoundsN5907 lbs0 lbs7 lbs
50N-Methyl-2-pyrrolidone872-50-43 lbs0 lbs3 lbs
51Mercury compoundsN4582 lbs0 lbs2 lbs
52Benzo[g,h,i]perylene191-24-20 lbs1 lbs1 lbs
53Mercury 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 38 chemicals reported within 2 miles for 2024.
Chemicals Released (2024 Only)(38 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
28Acrylic acid79-10-7127 lbs0 lbs127 lbs
29Dicyclopentadiene77-73-630 lbs0 lbs30 lbs
30Aluminum (fume or dust)7429-90-526 lbs0 lbs26 lbs
31Nitric acid7697-37-220 lbs0 lbs20 lbs
32n-Butyl alcohol71-36-37 lbs0 lbs7 lbs
33Ethyl acrylate140-88-56 lbs0 lbs6 lbs
34Lead7439-92-10 lbs5 lbs5 lbs
35sec-Butyl alcohol78-92-25 lbs0 lbs5 lbs
36Polycyclic aromatic compoundsN5903 lbs0 lbs3 lbs
37Ethylene glycol107-21-11 lbs0 lbs1 lbs
38Mercury And Mercury CompoundsN4581 lbs0 lbs1 lbs
Loading property data...
🏘️Explore More Properties