Home > Analysis: 515 Main St, Pasadena, TX 77506

📊 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

515 MAIN ST PASADENA 77506

Building Size

1,102 sqft

Total structure area from HCAD building records.

Elevation

24.84 ft

Height above sea level from USGS data.

FEMA Flood Zone

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)

Property not flooded at current water level. No damage to calculate.

Depth-Damage Estimate (Neighborhood Comparison)

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: 14.84 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

High

Higher pollution than 88% 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)

5.12 million lbs

Extremely High

785.5x more than typical Houston property
≈ 256 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)

5.11 million lbs

Extremely High

1060.5x 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)

3 thousand lbs

Very High

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.

Period	Total	Air	Water
Typical Houston Property (2014-2024)	6,524 lbs	4,822 lbs	0 lbs
This Property (2014-2024)	5,124,818 lbs	5,113,968 lbs	2,813 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	390,341 lbs	283,589 lbs	71 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

70-79th

5.8%

80-89th

4.3%

90-100thLowest Pollution

34.2%

Higher pollution than 88% 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 15% most polluted).

Top chemicals released near this property (past 10 years):

Hydrogen cyanide, n-Hexane, Propylene, Xylene (mixed isomers), Toluene

View the full list of 43 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (43 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	Hydrogen cyanide	74-90-8	1,032,286	0	1,032,286
2	n-Hexane	110-54-3	1,031,342	170	1,031,932
3	Propylene	115-07-1	465,601	0	465,601
4	Xylene (mixed isomers)	1330-20-7	431,507	756	434,632
5	Toluene	108-88-3	304,674	218	305,782
6	Benzene	71-43-2	275,081	138	275,785
7	Methanol	67-56-1	269,438	0	269,438
8	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	250,113	0	250,113
9	Hydrogen sulfide	7783-06-4	244,215	0	244,216
10	Ethylene	74-85-1	206,072	0	206,072
11	Ammonia	7664-41-7	151,468	0	151,468
12	Diethanolamine	111-42-2	102,160	0	102,160
13	Vinyl acetate	108-05-4	70,754	0	70,754
14	Cyclohexane	110-82-7	67,572	0	68,340
15	Ethylbenzene	100-41-4	65,915	65	66,582
16	1,3-Butadiene	106-99-0	45,992	0	45,992
17	1,2,4-Trimethylbenzene	95-63-6	32,912	105	33,294
18	Naphthalene	91-20-3	20,385	24	21,740
19	Cumene	98-82-8	9,122	10	9,317
20	Dimethylamine	124-40-3	6,912	0	6,912
21	Acetaldehyde	75-07-0	6,116	0	6,116
22	Ethylene glycol	107-21-1	5,553	0	5,562
23	Biphenyl	92-52-4	5,161	0	5,502
24	Polycyclic aromatic compounds	N590	2,886	117	3,204
25	Formaldehyde	50-00-0	2,284	0	2,284
26	Acrylonitrile	107-13-1	2,224	0	2,224
27	Phenol	108-95-2	815	1,155	1,970
28	Propylene oxide	75-56-9	1,829	0	1,829
29	Formic acid	64-18-6	1,406	0	1,406
30	Styrene	100-42-5	1,198	0	1,198
31	Hydrogen fluoride	7664-39-3	229	0	299
32	Chlorine	7782-50-5	268	0	268
33	Nickel	7440-02-0	120	0	120
34	Mercury	7439-97-6	106	0	106
35	Certain glycol ethers	N230	92	0	92
36	Manganese	7439-96-5	70	0	70
37	C.I. Food Red 15	81-88-9	40	0	40
38	Chromium	7440-47-3	40	0	40
39	Lead And Lead Compounds	N420	3	22	25
40	Lead compounds	N420	2	22	23
41	Benzo[g,h,i]perylene	191-24-2	3	7	11
42	Methyl tert-butyl ether	1634-04-4	2	5	10
43	Mercury And Mercury Compounds	N458	1	0	1

Top chemicals released near this property (2024 only):

Diethanolamine, Hydrogen cyanide, n-Hexane, Xylene (mixed isomers), Toluene

View the full list of 41 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (41 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Diethanolamine	111-42-2	10,092	0	85,621
2	Hydrogen cyanide	74-90-8	73,728	0	73,728
3	n-Hexane	110-54-3	39,590	0	39,623
4	Xylene (mixed isomers)	1330-20-7	35,159	25	35,495
5	Toluene	108-88-3	22,119	5	22,194
6	Methanol	67-56-1	15,730	0	20,533
7	Benzene	71-43-2	18,923	4	19,039
8	Ammonia	7664-41-7	9,731	0	18,793
9	Hydrogen sulfide	7783-06-4	14,345	0	14,345
10	Propylene	115-07-1	10,544	0	10,544
11	Ethylene	74-85-1	9,396	0	9,396
12	Ethylene glycol	107-21-1	529	0	7,568
13	Vinyl acetate	108-05-4	5,850	0	5,852
14	Ethylbenzene	100-41-4	4,409	7	4,455
15	Cyclohexane	110-82-7	4,403	0	4,421
16	1,2,4-Trimethylbenzene	95-63-6	3,367	0	3,508
17	Phenol	108-95-2	255	8	3,101
18	Formaldehyde	50-00-0	255	0	2,348
19	Formic acid	64-18-6	189	0	1,968
20	Naphthalene	91-20-3	1,403	1	1,483
21	Certain glycol ethers	N230	11	0	1,122
22	1,3-Butadiene	106-99-0	956	0	956
23	Nickel And Nickel Compounds	N495	0	0	915
24	Dimethylamine	124-40-3	864	0	884
25	Cumene	98-82-8	555	0	556
26	Lead And Lead Compounds	N420	1	1	391
27	Polycyclic aromatic compounds	N590	353	15	369
28	Acrylonitrile	107-13-1	278	0	294
29	Lead compounds	N420	0	0	269
30	Propylene oxide	75-56-9	255	0	255
31	Styrene	100-42-5	110	0	110
32	Acetaldehyde	75-07-0	45	0	45
33	Biphenyl	92-52-4	33	0	33
34	Manganese	7439-96-5	30	0	30
35	Chlorine	7782-50-5	25	0	25
36	Chromium	7440-47-3	25	0	25
37	Nickel	7440-02-0	24	0	24
38	Lead	7439-92-1	0	0	8
39	Mercury	7439-97-6	7	0	7
40	Benzo[g,h,i]perylene	191-24-2	0	5	5
41	Vanadium (except when contained in an alloy)	7440-62-2	0	0	3