Data-driven insights for local properties

📊 Environmental Assessment Report

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.

🌊 Part 1: Flood Risk Analysis

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
117 SYLVIA ST DEER PARK 77536
Building Size
1,268 sqft
Total structure area from HCAD building records.
Elevation
30.28 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
N/A
Data not available
Nearest Bayou Stage
N/A
No nearby bayou within monitoring range
Depth-Damage Estimate (HCAD Valuation)
$0
Property not flooded at current water level. No damage to calculate.
Depth-Damage Estimate (Neighborhood Comparison)
$0
Property not flooded at current water level. No damage to calculate.
Analysis Method
COG Bathtub 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: 20.28 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.

  • FEMA Zone X (minimal hazard) - flood insurance available at preferred rates.
  • Review the interactive flood simulator to understand how different rainfall events could affect this property.
  • Contact Harris County Flood Control District (HCFCD) for drainage projects and flood information.

🏭 Part 2: Industrial Pollution Exposure

Property Pollution Ranking
Very High
Higher pollution than 92% of Houston homes
This ranking compares pollution levels within 2 miles of this property against 10,000 randomly sampled Houston metro properties. Lower percentiles indicate higher pollution exposure.
Industrial Pollution Nearby (Last 10 Years)
16.24 million lbs
Extremely High
2489.0x more than typical Houston property
≈ 812 dump trucks of chemicals within 2 miles
Total chemical releases from all industrial facilities within a 2-mile radius over the past decade (2014–2024). Data from EPA's Toxic Release Inventory tracking air, water, and land discharges.
💨 Air Pollution (Last 10 Years)
9.4 million lbs
Extremely High
1948.4x more than typical Houston property
Chemicals released into the air from nearby facilities over 10 years. Includes both fugitive emissions (leaks, evaporation) and stack emissions (smokestacks, vents). May affect local air quality.
💧 Water Pollution (Last 10 Years)
6.84 million lbs
Extremely High
Most Houston properties have none nearby
Chemical discharges to surface water (bayous, streams, drainage) from industrial facilities within 2 miles over the past decade. May impact local waterways and drainage systems.

❤️ 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)16,239,023 lbs9,396,037 lbs6,842,987 lbs
Typical Houston Property (2024 Only)2 lbs1 lbs0 lbs
This Property (2024 Only)1,564,247 lbs1,160,767 lbs257,856 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, 1,3-Butadiene, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Propylene

View the full list of 78 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (78 chemicals)

#ChemicalCAS#Air (lbs, 10yr)Water (lbs, 10yr)Total (lbs, 10yr)
1Nitrate compounds (water dissociable; reportable only when in aqueous solution)N5110 lbs6,472,333 lbs6,472,333 lbs
2Ethylene74-85-11,625,382 lbs0 lbs1,625,382 lbs
31,3-Butadiene106-99-01,021,400 lbs45 lbs1,021,445 lbs
4Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7664-93-91,016,215 lbs0 lbs1,016,215 lbs
5Propylene115-07-1987,510 lbs0 lbs987,510 lbs
6Cumene98-82-8851,544 lbs882 lbs852,426 lbs
7Phenol108-95-2634,156 lbs1,108 lbs635,264 lbs
8Toluene108-88-3505,020 lbs199 lbs505,219 lbs
9Ammonia7664-41-7453,129 lbs12,151 lbs465,280 lbs
10Benzene71-43-2434,310 lbs242 lbs434,552 lbs
11Methanol67-56-1266,482 lbs133,638 lbs400,120 lbs
12Xylene (mixed isomers)1330-20-7255,366 lbs179 lbs255,545 lbs
13Hydrogen sulfide7783-06-4211,383 lbs2,545 lbs213,928 lbs
14n-Hexane110-54-3173,420 lbs10 lbs173,430 lbs
15Hydrogen cyanide74-90-8126,501 lbs2,741 lbs129,242 lbs
164,4'-Isopropylidenediphenol80-05-7125,700 lbs0 lbs125,700 lbs
17Epichlorohydrin106-89-8121,011 lbs3,811 lbs124,822 lbs
18Sodium nitrite7632-00-00 lbs102,300 lbs102,300 lbs
19Acetonitrile75-05-883,752 lbs12,219 lbs95,971 lbs
20Ethylbenzene100-41-473,430 lbs222 lbs73,652 lbs
21Isoprene78-79-569,617 lbs137 lbs69,754 lbs
22Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7647-01-063,579 lbs0 lbs63,579 lbs
23Zinc compoundsN982952 lbs62,059 lbs63,011 lbs
24Propylene oxide75-56-953,747 lbs0 lbs53,747 lbs
25Ethylene glycol107-21-131,251 lbs9,387 lbs40,638 lbs
26Diethanolamine111-42-235,781 lbs0 lbs35,781 lbs
27Naphthalene91-20-321,426 lbs206 lbs21,632 lbs
28Dichloromethane75-09-219,581 lbs39 lbs19,620 lbs
29Butyl acrylate141-32-218,363 lbs0 lbs18,363 lbs
30Cyclohexane110-82-713,253 lbs284 lbs13,537 lbs
31Maleic anhydride108-31-612,243 lbs0 lbs12,243 lbs
32Cumene hydroperoxide80-15-911,006 lbs0 lbs11,006 lbs
33Trade SecretTRD SECRT9,705 lbs0 lbs9,705 lbs
341,2,4-Trimethylbenzene95-63-68,919 lbs0 lbs8,919 lbs
35Dicyclopentadiene77-73-68,670 lbs0 lbs8,670 lbs
36Acetophenone98-86-26,714 lbs1,462 lbs8,176 lbs
37Allyl alcohol107-18-67,427 lbs626 lbs8,053 lbs
38sec-Butyl alcohol78-92-21,946 lbs5,600 lbs7,546 lbs
39Chlorine7782-50-57,351 lbs0 lbs7,351 lbs
40Glycidol556-52-52,841 lbs4,410 lbs7,251 lbs
41Acetaldehyde75-07-06,320 lbs123 lbs6,443 lbs
42Manganese compoundsN450137 lbs5,037 lbs5,174 lbs
43Methyl isobutyl ketone108-10-14,714 lbs2 lbs4,716 lbs
44Tetrachloroethylene127-18-44,088 lbs176 lbs4,264 lbs
45Nickel compoundsN49580 lbs3,764 lbs3,844 lbs
46Styrene100-42-53,800 lbs16 lbs3,816 lbs
47Barium compounds (except for barium sulfate (CAS No. 7727-43-7))N0400 lbs1,936 lbs1,936 lbs
48Lead compoundsN420509 lbs1,376 lbs1,886 lbs
49Phenanthrene85-01-81,547 lbs159 lbs1,706 lbs
50Nonylphenol EthoxylatesN5351,381 lbs0 lbs1,381 lbs
51Polycyclic aromatic compoundsN590576 lbs130 lbs782 lbs
52Lead And Lead CompoundsN420267 lbs421 lbs689 lbs
53Anthracene120-12-7534 lbs70 lbs604 lbs
54Cresol (mixed isomers)1319-77-3430 lbs146 lbs576 lbs
55Certain glycol ethersN230557 lbs0 lbs557 lbs
56Acrylic acid79-10-7348 lbs0 lbs348 lbs
57Mercury compoundsN458105 lbs212 lbs317 lbs
58Mercury And Mercury CompoundsN45836 lbs195 lbs230 lbs
59Benzo[g,h,i]perylene191-24-296 lbs74 lbs170 lbs
60Cobalt compoundsN09633 lbs89 lbs122 lbs
61Barium And Barium CompoundsN0400 lbs99 lbs99 lbs
62Carbon disulfide75-15-084 lbs0 lbs84 lbs
63NonylphenolN53061 lbs0 lbs61 lbs
64Nitric acid7697-37-249 lbs0 lbs49 lbs
65Methyl acrylate96-33-347 lbs0 lbs47 lbs
66Cobalt And Cobalt CompoundsN09612 lbs24 lbs36 lbs
67Ethyl acrylate140-88-535 lbs0 lbs35 lbs
68Triethylamine121-44-834 lbs0 lbs34 lbs
69Chromium7440-47-30 lbs33 lbs33 lbs
70Nickel7440-02-00 lbs31 lbs31 lbs
71Dioxin and dioxin-like compoundsN1507 lbs23 lbs31 lbs
72Methyl methacrylate80-62-625 lbs0 lbs25 lbs
73Diphenylamine122-39-410 lbs14 lbs24 lbs
74Boron trifluoride7637-07-211 lbs0 lbs11 lbs
75Propionaldehyde123-38-68 lbs0 lbs8 lbs
76DiisocyanatesN1206 lbs0 lbs6 lbs
77N-Methyl-2-pyrrolidone872-50-43 lbs0 lbs3 lbs
78Acetamide60-35-52 lbs0 lbs2 lbs

Top chemicals released near this property (2024 only):

Ethylene, Nitrate compounds (water dissociable; reportable only when in aqueous solution), Propylene, 1,3-Butadiene, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)

View the full list of 60 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (60 chemicals)

#ChemicalCAS#Air (lbs/yr)Water (lbs/yr)Total (lbs/yr)
1Ethylene74-85-1438,120 lbs0 lbs438,120 lbs
2Nitrate compounds (water dissociable; reportable only when in aqueous solution)N5110 lbs204,942 lbs204,942 lbs
3Propylene115-07-1142,970 lbs0 lbs142,970 lbs
41,3-Butadiene106-99-0108,643 lbs9 lbs108,652 lbs
5Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7664-93-997,000 lbs0 lbs97,000 lbs
64,4'-Isopropylidenediphenol80-05-710,300 lbs0 lbs89,800 lbs
7Cumene98-82-852,712 lbs31 lbs52,743 lbs
8Toluene108-88-350,315 lbs10 lbs51,765 lbs
9Methanol67-56-114,597 lbs27,174 lbs47,222 lbs
10Phenol108-95-240,343 lbs254 lbs42,761 lbs
11Benzene71-43-239,600 lbs7 lbs41,769 lbs
12Hydrogen sulfide7783-06-438,758 lbs289 lbs39,047 lbs
13Ammonia7664-41-723,983 lbs1,580 lbs33,278 lbs
14Xylene (mixed isomers)1330-20-718,400 lbs10 lbs20,108 lbs
15Zinc compoundsN98217 lbs9,539 lbs15,325 lbs
16n-Hexane110-54-313,870 lbs10 lbs13,880 lbs
17Hydrogen cyanide74-90-813,000 lbs70 lbs13,070 lbs
18Diethanolamine111-42-23,059 lbs0 lbs12,859 lbs
19Lead compoundsN42093 lbs169 lbs12,855 lbs
20Epichlorohydrin106-89-812,291 lbs331 lbs12,622 lbs
21Nickel compoundsN4950 lbs218 lbs11,929 lbs
22Dichloromethane75-09-29,911 lbs10 lbs9,922 lbs
23Acetonitrile75-05-84,900 lbs3,100 lbs8,000 lbs
24Trade SecretTRD SECRT5,677 lbs0 lbs5,677 lbs
25Ethylbenzene100-41-44,620 lbs7 lbs5,262 lbs
26Sodium nitrite7632-00-00 lbs4,600 lbs4,600 lbs
27Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)7647-01-04,340 lbs0 lbs4,340 lbs
28Naphthalene91-20-32,290 lbs22 lbs4,044 lbs
29Glycidol556-52-51,002 lbs2,400 lbs3,402 lbs
30sec-Butyl alcohol78-92-2540 lbs2,100 lbs2,640 lbs
31Isoprene78-79-52,360 lbs16 lbs2,376 lbs
32Ethyl acrylate140-88-56 lbs0 lbs1,809 lbs
33Ethylene glycol107-21-11,527 lbs0 lbs1,527 lbs
34Styrene100-42-51,160 lbs2 lbs1,371 lbs
35Cyclohexane110-82-7858 lbs17 lbs875 lbs
36Maleic anhydride108-31-6701 lbs0 lbs701 lbs
37Acetophenone98-86-2188 lbs510 lbs698 lbs
38Butyl acrylate141-32-2597 lbs0 lbs597 lbs
391,2,4-Trimethylbenzene95-63-6546 lbs0 lbs546 lbs
40Dicyclopentadiene77-73-6493 lbs0 lbs503 lbs
41Polycyclic aromatic compoundsN59012 lbs14 lbs390 lbs
42Manganese compoundsN45037 lbs350 lbs387 lbs
43Cumene hydroperoxide80-15-9384 lbs0 lbs384 lbs
44NonylphenolN5302 lbs0 lbs374 lbs
45Benzo[g,h,i]perylene191-24-20 lbs1 lbs334 lbs
46Tetrachloroethylene127-18-4270 lbs4 lbs274 lbs
47Acrylic acid79-10-7127 lbs0 lbs127 lbs
48Chlorine7782-50-5101 lbs0 lbs101 lbs
49Mercury compoundsN4580 lbs53 lbs54 lbs
50Dioxin and dioxin-like compoundsN1501 lbs0 lbs53 lbs
51Methyl isobutyl ketone108-10-10 lbs0 lbs44 lbs
52Lead7439-92-10 lbs0 lbs38 lbs
53Mercury And Mercury CompoundsN45817 lbs0 lbs32 lbs
54Carbon disulfide75-15-012 lbs0 lbs12 lbs
55Nitric acid7697-37-211 lbs0 lbs11 lbs
56Chromium7440-47-30 lbs2 lbs8 lbs
57Phenanthrene85-01-86 lbs1 lbs7 lbs
58Nickel7440-02-00 lbs2 lbs6 lbs
59Anthracene120-12-71 lbs1 lbs2 lbs
60Propylene oxide75-56-91 lbs0 lbs1 lbs

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