Home > Analysis: 1111 Johnson St, Pasadena, TX 77506 07/28/2025

📊 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

1111 JOHNSON ST PASADENA 77506

Building Size

1,716 sqft

Total structure area from HCAD building records.

Elevation

26.74 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: 16.74 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 78% 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)

625 thousand lbs

Very High

95.8x more than typical Houston property
≈ 31 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)

625 thousand lbs

Extremely High

129.6x 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)

463 lbs

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)	625,245 lbs	624,752 lbs	463 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	55,345 lbs	45,542 lbs	15 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 78% 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 25% most polluted).

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

Methanol, Ammonia, Vinyl acetate, Xylene (mixed isomers), Toluene

View the full list of 32 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (32 chemicals)

#	Chemical	CAS#	Air (lbs, 10yr)	Water (lbs, 10yr)	Total (lbs, 10yr)
1	Methanol	67-56-1	267,145	0	267,145
2	Ammonia	7664-41-7	107,863	0	107,863
3	Vinyl acetate	108-05-4	70,754	0	70,754
4	Xylene (mixed isomers)	1330-20-7	47,090	33	47,132
5	Toluene	108-88-3	35,176	27	35,212
6	n-Hexane	110-54-3	23,595	170	23,766
7	1,2,4-Trimethylbenzene	95-63-6	22,527	105	22,635
8	Benzene	71-43-2	13,609	24	13,635
9	Dimethylamine	124-40-3	6,912	0	6,912
10	Ethylbenzene	100-41-4	6,798	22	6,822
11	Acetaldehyde	75-07-0	6,116	0	6,116
12	Ethylene glycol	107-21-1	5,553	0	5,553
13	Formaldehyde	50-00-0	2,284	0	2,284
14	Acrylonitrile	107-13-1	2,224	0	2,224
15	Propylene oxide	75-56-9	1,829	0	1,829
16	Formic acid	64-18-6	1,406	0	1,406
17	Cyclohexane	110-82-7	995	0	995
18	Phenol	108-95-2	815	0	815
19	Naphthalene	91-20-3	596	21	618
20	Diethanolamine	111-42-2	600	0	600
21	Cumene	98-82-8	437	10	448
22	Nickel	7440-02-0	120	0	120
23	Certain glycol ethers	N230	92	0	92
24	Manganese	7439-96-5	70	0	70
25	Styrene	100-42-5	56	0	56
26	C.I. Food Red 15	81-88-9	40	0	40
27	Chromium	7440-47-3	40	0	40
28	Lead And Lead Compounds	N420	3	22	25
29	Lead compounds	N420	2	22	23
30	Methyl tert-butyl ether	1634-04-4	2	5	10
31	Polycyclic aromatic compounds	N590	3	2	4
32	Mercury And Mercury Compounds	N458	1	0	1

Top chemicals released near this property (2024 only):

Methanol, Ammonia, Vinyl acetate, Xylene (mixed isomers), Toluene

View the full list of 29 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (29 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Methanol	67-56-1	15,730	0	20,533
2	Ammonia	7664-41-7	6,678	0	7,432
3	Vinyl acetate	108-05-4	5,850	0	5,852
4	Xylene (mixed isomers)	1330-20-7	3,651	5	3,658
5	Toluene	108-88-3	3,558	3	3,562
6	n-Hexane	110-54-3	2,883	0	2,883
7	Formaldehyde	50-00-0	255	0	2,348
8	1,2,4-Trimethylbenzene	95-63-6	2,183	0	2,186
9	Formic acid	64-18-6	189	0	1,968
10	Benzene	71-43-2	1,415	2	1,417
11	Dimethylamine	124-40-3	864	0	884
12	Ethylene glycol	107-21-1	529	0	549
13	Ethylbenzene	100-41-4	496	3	499
14	Acrylonitrile	107-13-1	278	0	294
15	Phenol	108-95-2	255	0	276
16	Lead compounds	N420	0	0	269
17	Propylene oxide	75-56-9	255	0	255
18	Cyclohexane	110-82-7	232	0	232
19	Naphthalene	91-20-3	55	1	60
20	Acetaldehyde	75-07-0	45	0	45
21	Cumene	98-82-8	33	0	33
22	Manganese	7439-96-5	30	0	30
23	Chromium	7440-47-3	25	0	25
24	Nickel	7440-02-0	24	0	24
25	Certain glycol ethers	N230	11	0	11
26	Diethanolamine	111-42-2	10	0	10
27	Styrene	100-42-5	7	0	7
28	Lead And Lead Compounds	N420	1	1	1
29	Polycyclic aromatic compounds	N590	0	0	1