Home > Analysis: 221 Helen Dr, Deer Park, TX 77536 09/26/2025

📊 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

221 HELEN DR DEER PARK 77536

Building Size

2,067 sqft

Total structure area from HCAD building records.

Elevation

26.27 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: 16.27 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)

16.65 million lbs

Extremely High

2551.9x more than typical Houston property
≈ 832 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)

9.8 million lbs

Extremely High

2033.2x 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

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)	16,649,329 lbs	9,804,946 lbs	6,844,307 lbs
Typical Houston Property (2024 Only)	2 lbs	1 lbs	0 lbs
This Property (2024 Only)	1,603,512 lbs	1,195,780 lbs	258,020 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 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 79 chemicals below.

Chemicals Released (2014-2024, 10-Year Total) (79 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	6,472,333	6,472,333
2	Ethylene	74-85-1	1,625,382	0	1,625,382
3	1,3-Butadiene	106-99-0	1,021,400	45	1,021,445
4	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	1,016,215	0	1,016,215
5	Propylene	115-07-1	987,510	0	987,510
6	Cumene	98-82-8	851,544	882	852,426
7	Ammonia	7664-41-7	663,258	12,151	675,409
8	Phenol	108-95-2	634,156	1,108	635,264
9	Toluene	108-88-3	505,020	199	505,219
10	Benzene	71-43-2	434,310	242	434,552
11	Methanol	67-56-1	266,482	133,638	400,120
12	Xylene (mixed isomers)	1330-20-7	255,366	179	255,545
13	Hydrogen sulfide	7783-06-4	211,383	2,545	213,928
14	n-Hexane	110-54-3	173,420	10	173,430
15	Hydrogen cyanide	74-90-8	126,501	2,741	129,242
16	4,4'-Isopropylidenediphenol	80-05-7	125,700	0	125,700
17	Epichlorohydrin	106-89-8	121,011	3,811	124,822
18	Vinyl chloride	75-01-4	122,061	46	122,106
19	Sodium nitrite	7632-00-0	0	102,300	102,300
20	Acetonitrile	75-05-8	83,752	12,219	95,971
21	Ethylbenzene	100-41-4	73,430	222	73,652
22	Acetaldehyde	75-07-0	70,863	1,398	72,261
23	Isoprene	78-79-5	69,617	137	69,754
24	Zinc compounds	N982	5,641	62,059	67,700
25	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	67,065	0	67,065
26	Propylene oxide	75-56-9	53,747	0	53,747
27	Ethylene glycol	107-21-1	31,251	9,387	40,638
28	Diethanolamine	111-42-2	35,781	0	35,781
29	Naphthalene	91-20-3	21,426	206	21,632
30	Dichloromethane	75-09-2	19,581	39	19,620
31	Butyl acrylate	141-32-2	18,363	0	18,363
32	Cyclohexane	110-82-7	13,253	284	13,537
33	Maleic anhydride	108-31-6	12,243	0	12,243
34	Cumene hydroperoxide	80-15-9	11,006	0	11,006
35	Trade Secret	TRD SECRT	9,705	0	9,705
36	1,2,4-Trimethylbenzene	95-63-6	8,919	0	8,919
37	Dicyclopentadiene	77-73-6	8,670	0	8,670
38	Acetophenone	98-86-2	6,714	1,462	8,176
39	Allyl alcohol	107-18-6	7,427	626	8,053
40	sec-Butyl alcohol	78-92-2	1,946	5,600	7,546
41	Chlorine	7782-50-5	7,352	0	7,352
42	Glycidol	556-52-5	2,841	4,410	7,251
43	Manganese compounds	N450	137	5,037	5,174
44	Methyl isobutyl ketone	108-10-1	4,714	2	4,716
45	Tetrachloroethylene	127-18-4	4,088	176	4,264
46	Diisocyanates	N120	4,007	0	4,007
47	Nickel compounds	N495	80	3,764	3,844
48	Styrene	100-42-5	3,800	16	3,816
49	Barium compounds (except for barium sulfate (CAS No. 7727-43-7))	N040	0	1,936	1,936
50	Lead compounds	N420	509	1,376	1,886
51	Phenanthrene	85-01-8	1,547	159	1,706
52	Nonylphenol Ethoxylates	N535	1,381	0	1,381
53	Polycyclic aromatic compounds	N590	576	130	782
54	Lead And Lead Compounds	N420	267	421	689
55	Anthracene	120-12-7	534	70	604
56	Cresol (mixed isomers)	1319-77-3	430	146	576
57	Certain glycol ethers	N230	557	0	557
58	Acrylic acid	79-10-7	348	0	348
59	Mercury compounds	N458	105	212	317
60	Mercury And Mercury Compounds	N458	36	195	230
61	Benzo[g,h,i]perylene	191-24-2	96	74	170
62	Cobalt compounds	N096	33	89	122
63	Barium And Barium Compounds	N040	0	99	99
64	Carbon disulfide	75-15-0	84	0	84
65	Nonylphenol	N530	61	0	61
66	Nitric acid	7697-37-2	49	0	49
67	Methyl acrylate	96-33-3	47	0	47
68	Cobalt And Cobalt Compounds	N096	12	24	36
69	Ethyl acrylate	140-88-5	35	0	35
70	Triethylamine	121-44-8	34	0	34
71	Chromium	7440-47-3	0	33	33
72	Nickel	7440-02-0	0	31	31
73	Dioxin and dioxin-like compounds	N150	7	23	31
74	Methyl methacrylate	80-62-6	25	0	25
75	Diphenylamine	122-39-4	10	14	24
76	Boron trifluoride	7637-07-2	11	0	11
77	Propionaldehyde	123-38-6	8	0	8
78	N-Methyl-2-pyrrolidone	872-50-4	3	0	3
79	Acetamide	60-35-5	2	0	2

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 63 chemicals reported within 2 miles for 2024.

Chemicals Released (2024 Only) (63 chemicals)

#	Chemical	CAS#	Air (lbs/yr)	Water (lbs/yr)	Total (lbs/yr)
1	Ethylene	74-85-1	438,120	0	438,120
2	Nitrate compounds (water dissociable; reportable only when in aqueous solution)	N511	0	204,942	204,942
3	Propylene	115-07-1	142,970	0	142,970
4	1,3-Butadiene	106-99-0	108,643	9	108,652
5	Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7664-93-9	97,000	0	97,000
6	4,4'-Isopropylidenediphenol	80-05-7	10,300	0	89,800
7	Ammonia	7664-41-7	44,983	1,580	54,278
8	Cumene	98-82-8	52,712	31	52,743
9	Toluene	108-88-3	50,315	10	51,765
10	Methanol	67-56-1	14,597	27,174	47,222
11	Phenol	108-95-2	40,343	254	42,761
12	Benzene	71-43-2	39,600	7	41,769
13	Hydrogen sulfide	7783-06-4	38,758	289	39,047
14	Xylene (mixed isomers)	1330-20-7	18,400	10	20,108
15	Zinc compounds	N982	442	9,539	16,180
16	n-Hexane	110-54-3	13,870	10	13,880
17	Hydrogen cyanide	74-90-8	13,000	70	13,070
18	Diethanolamine	111-42-2	3,059	0	12,859
19	Lead compounds	N420	93	169	12,855
20	Epichlorohydrin	106-89-8	12,291	331	12,622
21	Nickel compounds	N495	0	218	11,929
22	Dichloromethane	75-09-2	9,911	10	9,922
23	Acetonitrile	75-05-8	4,900	3,100	8,000
24	Vinyl chloride	75-01-4	7,883	3	7,886
25	Trade Secret	TRD SECRT	5,677	0	5,677
26	Ethylbenzene	100-41-4	4,620	7	5,262
27	Sodium nitrite	7632-00-0	0	4,600	4,600
28	Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)	7647-01-0	4,340	0	4,340
29	Naphthalene	91-20-3	2,290	22	4,044
30	Acetaldehyde	75-07-0	3,861	161	4,022
31	Polycyclic aromatic compounds	N590	12	14	4,011
32	Glycidol	556-52-5	1,002	2,400	3,402
33	sec-Butyl alcohol	78-92-2	540	2,100	2,640
34	Isoprene	78-79-5	2,360	16	2,376
35	Diisocyanates	N120	1,843	0	1,843
36	Ethyl acrylate	140-88-5	6	0	1,809
37	Ethylene glycol	107-21-1	1,527	0	1,527
38	Styrene	100-42-5	1,160	2	1,371
39	Cyclohexane	110-82-7	858	17	875
40	Maleic anhydride	108-31-6	701	0	701
41	Acetophenone	98-86-2	188	510	698
42	Butyl acrylate	141-32-2	597	0	597
43	1,2,4-Trimethylbenzene	95-63-6	546	0	546
44	Dicyclopentadiene	77-73-6	493	0	503
45	Manganese compounds	N450	37	350	387
46	Cumene hydroperoxide	80-15-9	384	0	384
47	Nonylphenol	N530	2	0	374
48	Benzo[g,h,i]perylene	191-24-2	0	1	372
49	Tetrachloroethylene	127-18-4	270	4	274
50	Acrylic acid	79-10-7	127	0	127
51	Chlorine	7782-50-5	101	0	101
52	Mercury compounds	N458	0	53	54
53	Dioxin and dioxin-like compounds	N150	1	0	53
54	Methyl isobutyl ketone	108-10-1	0	0	44
55	Lead	7439-92-1	0	0	38
56	Mercury And Mercury Compounds	N458	17	0	32
57	Carbon disulfide	75-15-0	12	0	12
58	Nitric acid	7697-37-2	11	0	11
59	Chromium	7440-47-3	0	2	8
60	Phenanthrene	85-01-8	6	1	7
61	Nickel	7440-02-0	0	2	6
62	Anthracene	120-12-7	1	1	2
63	Propylene oxide	75-56-9	1	0	1