Home > Analysis: 3804 Washington St, Pasadena, TX 77503 03/14/2025

📊 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

3804 WASHINGTON ST PASADENA 77503

Building Size

1,510 sqft

Total structure area from HCAD building records.

Elevation

27.1 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: 17.1 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 86% 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)

3.03 million lbs

Extremely High

465.0x more than typical Houston property
≈ 152 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)

1.98 million lbs

Extremely High

409.9x 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)

1.06 million 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)	3,034,013 lbs	1,976,844 lbs	1,057,138 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	331,511 lbs	223,822 lbs	73,522 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 86% 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):

Nitrate compounds (water dissociable; reportable only when in aqueous solution), Cumene, Propylene, Acetophenone, Methanol

View the full list of 48 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (48 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	1,038,744	1,038,744
2	Cumene	98-82-8	518,059	11	518,071
3	Propylene	115-07-1	288,871	0	288,871
4	Acetophenone	98-86-2	206,492	3,645	210,136
5	Methanol	67-56-1	183,563	7,563	191,126
6	Benzene	71-43-2	171,685	27	171,714
7	Vinyl chloride	75-01-4	166,976	14	166,990
8	Acetaldehyde	75-07-0	92,740	3,956	96,696
9	Xylene (mixed isomers)	1330-20-7	48,626	33	48,668
10	Ethylene	74-85-1	40,872	0	40,872
11	1,2,4-Trimethylbenzene	95-63-6	40,441	105	40,549
12	Toluene	108-88-3	32,691	27	32,727
13	n-Hexane	110-54-3	30,503	170	30,674
14	Isobutyraldehyde	78-84-2	28,404	0	28,404
15	Ammonia	7664-41-7	20,960	2,681	23,641
16	Butyraldehyde	123-72-8	23,130	0	23,130
17	Boron trifluoride	7637-07-2	14,843	0	14,843
18	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	13,680	0	13,680
19	Phenol	108-95-2	12,719	4	12,723
20	Ethylbenzene	100-41-4	6,973	22	6,997
21	Chlorine	7782-50-5	6,477	0	6,477
22	Zinc compounds	N982	5,277	0	5,277
23	n-Butyl alcohol	71-36-3	4,032	0	4,032
24	Ethylene glycol	107-21-1	3,775	0	3,775
25	Phthalic anhydride	85-44-9	3,545	0	3,545
26	o-Cresol	95-48-7	1,985	0	1,985
27	Maleic anhydride	108-31-6	1,686	0	1,686
28	o-Xylene	95-47-6	1,330	0	1,330
29	Cyclohexane	110-82-7	1,073	0	1,073
30	Manganese compounds	N450	1,064	0	1,064
31	Formaldehyde	50-00-0	1,061	0	1,061
32	Naphthalene	91-20-3	1,012	21	1,034
33	1,3-Butadiene	106-99-0	938	0	938
34	Lead compounds	N420	288	22	309
35	Manganese And Manganese Compounds	N450	309	0	309
36	Diethanolamine	111-42-2	205	0	205
37	1,2-Dibromoethane	106-93-4	133	0	133
38	1,2-Dichloroethane	107-06-2	127	0	127
39	Diphenylamine	122-39-4	126	0	126
40	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	96	0	96
41	Lead And Lead Compounds	N420	55	22	78
42	Chromium	7440-47-3	0	33	33
43	Nickel	7440-02-0	0	31	31
44	Certain glycol ethers	N230	12	0	12
45	Methyl tert-butyl ether	1634-04-4	2	5	10
46	Polycyclic aromatic compounds	N590	2	2	4
47	Piperonyl butoxide	51-03-6	4	0	4
48	Mercury And Mercury Compounds	N458	1	0	1

Top chemicals released near this property (2024 only):

Nitrate compounds (water dissociable; reportable only when in aqueous solution), Propylene, Cumene, Ethylene, Methanol

View the full list of 38 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (38 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	72,435	72,435
2	Propylene	115-07-1	57,757	0	57,757
3	Cumene	98-82-8	35,001	0	35,140
4	Ethylene	74-85-1	31,339	0	31,339
5	Methanol	67-56-1	3,330	336	25,653
6	Benzene	71-43-2	19,530	2	19,533
7	Acetophenone	98-86-2	17,719	350	18,069
8	Ammonia	7664-41-7	6,269	0	13,983
9	Vinyl chloride	75-01-4	13,207	1	13,208
10	Acetaldehyde	75-07-0	8,300	380	8,680
11	Phenol	108-95-2	4,324	0	5,676
12	1,2,4-Trimethylbenzene	95-63-6	4,078	0	4,777
13	Isobutyraldehyde	78-84-2	4,431	0	4,431
14	n-Hexane	110-54-3	4,280	0	4,280
15	Xylene (mixed isomers)	1330-20-7	3,736	5	3,880
16	Toluene	108-88-3	2,900	3	2,903
17	Butyraldehyde	123-72-8	2,507	0	2,507
18	Boron trifluoride	7637-07-2	1,178	0	1,178
19	o-Cresol	95-48-7	88	0	1,122
20	Formaldehyde	50-00-0	99	0	978
21	n-Butyl alcohol	71-36-3	638	0	638
22	Ethylene glycol	107-21-1	559	0	559
23	Chlorine	7782-50-5	487	0	487
24	Ethylbenzene	100-41-4	427	3	430
25	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	395	0	395
26	Zinc compounds	N982	323	0	323
27	1,3-Butadiene	106-99-0	295	0	295
28	Maleic anhydride	108-31-6	132	0	281
29	Cyclohexane	110-82-7	232	0	232
30	Naphthalene	91-20-3	132	1	133
31	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	96	0	96
32	Lead And Lead Compounds	N420	8	1	70
33	Diphenylamine	122-39-4	23	0	23
34	Chromium	7440-47-3	0	2	8
35	Nickel	7440-02-0	0	2	6
36	1,2-Dibromoethane	106-93-4	4	0	4
37	Certain glycol ethers	N230	1	0	1
38	Polycyclic aromatic compounds	N590	0	0	1