Home > Analysis: 107 Alastair Dr, Pasadena, TX 77506 04/11/2025

📊 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

107 ALASTAIR DR PASADENA 77506

Building Size

1,304 sqft

Total structure area from HCAD building records.

Elevation

25.11 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: 15.11 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)

5.08 million lbs

Extremely High

778.6x more than typical Houston property
≈ 254 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)

5.03 million lbs

Extremely High

1043.3x 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)

41 thousand lbs

Extremely 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)	5,079,986 lbs	5,031,227 lbs	41,064 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	374,506 lbs	291,221 lbs	602 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):

Ethylene, n-Hexane, Ammonia, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Propylene

View the full list of 53 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (53 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	Ethylene	74-85-1	1,138,404	0	1,138,404
2	n-Hexane	110-54-3	1,048,788	170	1,049,371
3	Ammonia	7664-41-7	763,546	33,581	797,127
4	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	528,487	0	528,487
5	Propylene	115-07-1	271,630	0	271,630
6	Methanol	67-56-1	268,262	0	268,262
7	Hydrogen cyanide	74-90-8	213,734	0	213,734
8	Xylene (mixed isomers)	1330-20-7	208,704	129	211,171
9	Toluene	108-88-3	160,136	43	161,046
10	Benzene	71-43-2	86,351	44	86,950
11	Vinyl acetate	108-05-4	70,754	0	70,754
12	1,2,4-Trimethylbenzene	95-63-6	47,768	105	48,136
13	Ethylbenzene	100-41-4	38,993	61	39,648
14	Hydrogen sulfide	7783-06-4	37,772	0	37,773
15	1,3-Butadiene	106-99-0	29,382	0	29,383
16	Naphthalene	91-20-3	16,264	21	17,608
17	Cyclohexane	110-82-7	15,071	0	15,830
18	Boron trifluoride	7637-07-2	14,843	0	14,843
19	Zinc compounds	N982	7,485	6,851	14,336
20	Cumene	98-82-8	9,062	10	9,255
21	Dimethylamine	124-40-3	6,912	0	6,912
22	Chlorine	7782-50-5	6,750	0	6,750
23	Acetaldehyde	75-07-0	6,116	0	6,116
24	Ethylene glycol	107-21-1	5,554	0	5,554
25	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	5,281	0	5,281
26	Phenol	108-95-2	5,163	0	5,163
27	Biphenyl	92-52-4	4,816	0	5,138
28	Formaldehyde	50-00-0	3,345	0	3,345
29	Acrylonitrile	107-13-1	2,224	0	2,224
30	o-Cresol	95-48-7	1,985	0	1,985
31	Propylene oxide	75-56-9	1,829	0	1,829
32	Formic acid	64-18-6	1,406	0	1,406
33	Manganese compounds	N450	1,064	0	1,064
34	Maleic anhydride	108-31-6	1,046	0	1,046
35	Diethanolamine	111-42-2	600	0	600
36	Lead compounds	N420	288	22	309
37	Manganese And Manganese Compounds	N450	309	0	309
38	Hydrogen fluoride	7664-39-3	229	0	299
39	1,2-Dibromoethane	106-93-4	133	0	133
40	1,2-Dichloroethane	107-06-2	127	0	127
41	Diphenylamine	122-39-4	126	0	126
42	Nickel	7440-02-0	120	0	120
43	Certain glycol ethers	N230	92	0	92
44	Lead And Lead Compounds	N420	55	22	78
45	Manganese	7439-96-5	70	0	70
46	C.I. Food Red 15	81-88-9	40	0	40
47	Chromium	7440-47-3	40	0	40
48	Mercury	7439-97-6	30	0	30
49	Polycyclic aromatic compounds	N590	24	2	26
50	Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)	N090	11	0	11
51	Methyl tert-butyl ether	1634-04-4	2	5	10
52	Benzo[g,h,i]perylene	191-24-2	3	0	3
53	Mercury And Mercury Compounds	N458	1	0	1

Top chemicals released near this property (2024 only):

Ethylene, Ammonia, Methanol, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), n-Hexane

View the full list of 45 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (45 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Ethylene	74-85-1	115,179	0	115,179
2	Ammonia	7664-41-7	82,811	93	110,349
3	Methanol	67-56-1	15,808	0	42,599
4	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	17,341	0	17,341
5	n-Hexane	110-54-3	15,513	0	15,552
6	Zinc compounds	N982	678	476	9,871
7	Xylene (mixed isomers)	1330-20-7	8,835	15	9,294
8	Toluene	108-88-3	6,323	5	8,220
9	Vanadium compounds	N770	0	0	6,689
10	1,2,4-Trimethylbenzene	95-63-6	5,040	0	5,877
11	Vinyl acetate	108-05-4	5,850	0	5,852
12	Benzene	71-43-2	4,302	4	4,399
13	Phenol	108-95-2	2,206	0	3,579
14	Formaldehyde	50-00-0	354	0	3,326
15	Formic acid	64-18-6	189	0	1,968
16	Ethylbenzene	100-41-4	1,688	7	1,733
17	1,3-Butadiene	106-99-0	1,251	0	1,251
18	Boron trifluoride	7637-07-2	1,178	0	1,178
19	o-Cresol	95-48-7	88	0	1,122
20	Propylene	115-07-1	1,119	0	1,119
21	Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region)	N090	1	0	1,095
22	Hydrogen sulfide	7783-06-4	923	0	923
23	Dimethylamine	124-40-3	864	0	884
24	Naphthalene	91-20-3	728	1	747
25	Cumene	98-82-8	446	0	587
26	Ethylene glycol	107-21-1	530	0	550
27	Chlorine	7782-50-5	512	0	512
28	Lead And Lead Compounds	N420	8	1	460
29	Perfluorooctanoic acid	335-67-1	0	0	402
30	Cyclohexane	110-82-7	355	0	373
31	Acrylonitrile	107-13-1	278	0	294
32	Maleic anhydride	108-31-6	132	0	281
33	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	265	0	265
34	Propylene oxide	75-56-9	255	0	255
35	Lead compounds	N420	0	0	161
36	Mercury compounds	N458	0	0	46
37	Acetaldehyde	75-07-0	45	0	45
38	Manganese	7439-96-5	30	0	30
39	Chromium	7440-47-3	25	0	25
40	Nickel	7440-02-0	24	0	24
41	Diphenylamine	122-39-4	23	0	23
42	Certain glycol ethers	N230	11	0	11
43	Diethanolamine	111-42-2	10	0	10
44	1,2-Dibromoethane	106-93-4	4	0	4
45	Polycyclic aromatic compounds	N590	0	0	1