Data-driven insights for local properties

Complete Property Analysis

Environmental risk, tax analysis, and property details for 515 Gregg, Houston, TX 77020

HCAD #0351340000011
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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
515 Gregg, Houston, TX 77020
Elevation
43.22 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
103.6 acres
35.1% 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
26.4th percentile
Property Pollution Ranking
Moderate
Higher pollution than 74% of Houston homes
Compares pollution within 2mi against 10,000 Houston properties. Lower percentiles = higher pollution.
Industrial Pollution Nearby (10 Years)
391 thousandlbs
Very High
60.0x more than typical Houston property
≈ 20 dump trucks of chemicals within 2 miles
Air Pollution (10 Years)
391 thousandlbs
Very High
81.2x more than typical Houston property
Includes fugitive emissions (leaks) and stack emissions (smokestacks).
Water Pollution (10 Years)
61lbs
Above Typical
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)391,416 lbs391,355 lbs61 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)44,203 lbs44,203 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 74% 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):
n-Hexane, Zinc compounds, Styrene, Nitric acid, N-Methyl-2-pyrrolidone
View the full list of 25 chemicals below.
Chemicals Released (2014-2024, 10-Year Total)(25 chemicals)
#ChemicalCAS#Air (lbs/10yr)Water (lbs/10yr)Total (lbs/10yr)
1n-Hexane110-54-3125,432 lbs0 lbs125,432 lbs
2Zinc compoundsN98283,640 lbs0 lbs83,640 lbs
3Styrene100-42-572,717 lbs0 lbs72,717 lbs
4Nitric acid7697-37-235,459 lbs0 lbs35,459 lbs
5N-Methyl-2-pyrrolidone872-50-431,840 lbs0 lbs31,840 lbs
6Toluene108-88-323,715 lbs0 lbs23,715 lbs
71,2,4-Trimethylbenzene95-63-68,648 lbs0 lbs8,648 lbs
8Cyclohexane110-82-72,389 lbs0 lbs2,389 lbs
9Lead compoundsN4201,802 lbs54 lbs1,856 lbs
10Xylene (mixed isomers)1330-20-71,434 lbs0 lbs1,434 lbs
11Copper7440-50-81,277 lbs0 lbs1,277 lbs
12Copper compoundsN1001,020 lbs0 lbs1,020 lbs
13Ethylene glycol107-21-1856 lbs0 lbs856 lbs
14Lead And Lead CompoundsN420738 lbs0 lbs738 lbs
15Cadmium compoundsN078106 lbs0 lbs106 lbs
16Chromium compounds (except for chromite ore mined in the Transvaal Region)N09084 lbs0 lbs84 lbs
17Cadmium And Cadmium CompoundsN07870 lbs0 lbs70 lbs
18Cyanide compoundsN10650 lbs0 lbs50 lbs
19Chromium7440-47-316 lbs5 lbs25 lbs
20Nickel7440-02-020 lbs0 lbs20 lbs
21Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)N09019 lbs0 lbs19 lbs
22Nickel compoundsN49513 lbs0 lbs13 lbs
23Copper And Copper CompoundsN10010 lbs0 lbs10 lbs
24Cobalt7440-48-40 lbs0 lbs4 lbs
25Manganese7439-96-50 lbs2 lbs2 lbs
📋
Top chemicals released near this property (2024 only):
n-Hexane, Toluene, Zinc compounds, Styrene, Xylene (mixed isomers)
View the full list of 13 chemicals reported within 2 miles for 2024.
Chemicals Released (2024 Only)(13 chemicals)
#ChemicalCAS#Air (lbs/yr)Water (lbs/yr)Total (lbs/yr)
1n-Hexane110-54-312,290 lbs0 lbs12,290 lbs
2Toluene108-88-311,886 lbs0 lbs11,886 lbs
3Zinc compoundsN9829,028 lbs0 lbs9,028 lbs
4Styrene100-42-57,400 lbs0 lbs7,400 lbs
5Xylene (mixed isomers)1330-20-71,434 lbs0 lbs1,434 lbs
61,2,4-Trimethylbenzene95-63-61,210 lbs0 lbs1,210 lbs
7Nitric acid7697-37-2750 lbs0 lbs750 lbs
8Lead And Lead CompoundsN420161 lbs0 lbs161 lbs
9Copper7440-50-822 lbs0 lbs22 lbs
10Cadmium And Cadmium CompoundsN07810 lbs0 lbs10 lbs
11Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)N0906 lbs0 lbs6 lbs
12Cyanide compoundsN1065 lbs0 lbs5 lbs
13Chromium compounds (except for chromite ore mined in the Transvaal Region)N0901 lbs0 lbs1 lbs
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