Non-Compliance
TRI Reporter
Clean Air Act
Clean Water Act
RCRA
MEMC ELECTRONIC MATERIALS INC
Quick Summary
- •Released 681 lbs of toxic chemicals to the environment in the most recent TRI reporting year.
- •Currently out of compliance in at least one environmental program (CAA, CWA, or RCRA).
- •Assessed $0 in total penalties since records began.
- Address
-
501 PEARL DRIVE
O FALLON, MO 63366
View on map ↗ - County
- SAINT CHARLES County
- Industry
- Manufacturing
- NAICS (North American Industry Classification)
- 334413
- Inspections
- 2 · last May 15, 2024
- Total Penalties
- $0 · last Sep 29, 2000
- Registry ID
- 110000442101
How This Compares
#230
of 454 TRI reporters in MO
#7,584
of 16,877 TRI reporters in Manufacturing
Ranked by most recent year's total TRI releases.
Compliance Status (Last 12 Quarters)
Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.
0
Air (CAA)
Qtrs Non-Compliant
Qtrs Non-Compliant
12
Water (CWA)
Qtrs Non-Compliant
Qtrs Non-Compliant
0
Hazardous Waste (RCRA)
Qtrs Non-Compliant
Qtrs Non-Compliant
TRI Toxic Chemical Releases
Annual pounds of each toxic chemical released to air, water, and land, as reported to the EPA Toxic Release Inventory. Carcinogen (♦) and PFAS designations are per EPA and IARC classifications.
Emissions Trend (2015–2024)
+237% overall
| Year | Total Releases (lbs) | vs Prior Year |
|---|---|---|
| 2015 | 477 | — |
| 2016 | 715 | +50% |
| 2017 | 681 | -5% |
| 2018 | 725 | +6% |
| 2019 | 353 | -51% |
| 2020 | 950 | +169% |
| 2021 | 1,161 | +22% |
| 2022 | 2,077 | +79% |
| 2023 | 2,191 | +5% |
| 2024 | 1,607 | -27% |
2024
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Ozone | 858 | 858 | — | — | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 698 | 698 | — | — | — | |
| Hydrogen fluoride | 51 | 51 | — | — | — |
2023
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 1,216 | 1,216 | — | — | — | |
| Ozone | 923 | 923 | — | — | — | |
| Hydrogen fluoride | 52 | 52 | — | — | — |
2022
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 1,171 | 1,171 | — | — | — | |
| Ozone | 854 | 854 | — | — | — | |
| Hydrogen fluoride | 52 | 52 | — | — | — |
2021
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 1,110 | 1,110 | — | — | — | |
| Hydrogen fluoride | 51 | 51 | — | — | — |
2020
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 898 | 898 | — | — | — | |
| Hydrogen fluoride | 52 | 52 | — | — | — |
2019
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 301 | 301 | — | — | — | |
| Hydrogen fluoride | 52 | 52 | — | — | — |
2018
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 668 | 668 | — | — | — | |
| Hydrogen fluoride | 57 | 57 | — | — | — |
2017
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 681 | 681 | — | — | — |
2016
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 715 | 715 | — | — | — |
2015
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Nitric acid | — | — | — | — | — | |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | — | — | — | — | 33,708 | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 471 | 471 | — | — | — | |
| Hydrogen fluoride | 6 | 6 | — | — | — |
Waste Management & Recycling
How this facility manages toxic chemicals beyond direct releases — through recycling, energy recovery, and on-site or off-site treatment. Data from the most recent TRI reporting year. Quantities in pounds.
| Chemical | Released | Recycled | Energy Recovery | Treated |
|---|---|---|---|---|
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | — | — | — | 69,110 |
| Hydrogen fluoride | — | — | — | 10,361 |
| Ozone | — | — | — | 16,308 |
Compliance Violations
Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.
| Program | Type | Violation Date | Return to Compliance | Status |
|---|---|---|---|---|
| cwa | Effluent Violations - Numeric effluent violation | May 24, 2024 | — | Open |
| cwa | Effluent Violations - Numeric effluent violation | Apr 3, 2024 | — | Open |
| cwa | Schedule Event achieved late but reported | Jan 1, 2021 | — | Open |
| cwa | Schedule Event unachieved but reported | Jan 1, 2021 | Jun 1, 2021 | Resolved |
| cwa | Schedule Event reported late | Jan 1, 2021 | — | Open |
| cwa | Schedule Event unachieved and not reported | Jan 1, 2021 | Jun 1, 2021 | Resolved |
| rcra | Standards for Universal Waste Management: Standards for Small Quantity Handlers | Jun 5, 2013 | Aug 5, 2013 | Resolved |
| rcra | State Statutory or Regulatory requirements that are broader-in-scope than the federal RCRA requirements | May 14, 2008 | May 14, 2008 | Resolved |
| rcra | Standards Applicable to Generators of HW: Pre-Transport Requirements Applicable to Small and Large Quantity Generators | May 14, 2008 | May 14, 2008 | Resolved |
| rcra | Standards Applicable to Generators of HW: Pre-Transport Requirements Applicable to Small and Large Quantity Generators | Jun 22, 2004 | Jun 22, 2004 | Resolved |
| rcra | Standards Applicable to Generators of HW: General | Jun 22, 2004 | Jun 22, 2004 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Financial Requirements | Sep 11, 2003 | Sep 11, 2003 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General | Sep 20, 2001 | Oct 9, 2001 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Contingency Plan and Emergency Procedures | Sep 20, 2001 | Oct 9, 2001 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General Facility Standards | Dec 18, 2000 | Jan 27, 2001 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Special Provisions for Cleanup | Dec 18, 2000 | Feb 1, 2001 | Resolved |
| rcra | Standards Applicable to Generators of HW: General | Dec 18, 2000 | Jan 18, 2001 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Contingency Plan and Emergency Procedures | Dec 18, 2000 | Dec 18, 2000 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Closure and Post-Closure | May 25, 2000 | Jun 30, 2000 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Contingency Plan and Emergency Procedures | Feb 22, 1995 | May 4, 1995 | Resolved |
| rcra | Interim Status Standards for Owners and Operators of HW TSDs: Ground-Water Monitoring | Feb 22, 1995 | May 4, 1995 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Contingency Plan and Emergency Procedures | Apr 27, 1994 | Jul 1, 1994 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General Facility Standards | Apr 27, 1994 | Jul 1, 1994 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Closure and Post-Closure | Apr 27, 1994 | Jul 1, 1994 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Preparedness and Prevention | May 4, 1993 | Jun 3, 1993 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Closure and Post-Closure | May 4, 1993 | Jun 3, 1993 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General Facility Standards | May 4, 1993 | Jun 3, 1993 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Use and Management of Containers | May 4, 1993 | Jun 3, 1993 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Manifest System, Recordkeeping and Reporting | May 19, 1992 | Jun 28, 1992 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Use and Management of Containers | May 19, 1992 | Jun 28, 1992 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General Facility Standards | May 19, 1992 | Jun 20, 1992 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General | Jun 12, 1991 | Jul 25, 1991 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General | May 9, 1990 | Jun 8, 1990 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General | Mar 15, 1989 | Jun 9, 1989 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: Closure and Post-Closure | Jun 25, 1987 | May 9, 1990 | Resolved |
| rcra | Standards for Owners and Operators of HW TSDs: General | May 28, 1986 | Jul 23, 1986 | Resolved |
Discharge Limit Exceedances
Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.
| Pollutant | Violation | Reported | Limit | Exceedance | Period | Status |
|---|---|---|---|---|---|---|
| Chloride | DMR, Limited - Numeric Violation | 317.00 mg/L | 301.00 | +5% | Feb 2026 | Open |
| Chloride | DMR, Limited - Numeric Violation | 317.00 mg/L | 211.00 | +50% | Feb 2026 | Open |
| Chloride | DMR, Limited - Numeric Violation | 217.00 mg/L | 211.00 | +3% | Nov 2025 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 317.00 mg/L | 211.00 | +50% | Oct 2025 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 333.00 mg/L | 301.00 | +11% | Oct 2025 | Open |
| Chloride | DMR, Limited - Numeric Violation | 375.00 mg/L | 301.00 | +25% | Sep 2025 | Open |
| Chloride | DMR, Limited - Numeric Violation | 375.00 mg/L | 211.00 | +78% | Sep 2025 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 248.00 mg/L | 211.00 | +18% | Apr 2025 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 429.00 mg/L | 211.00 | +103% | Mar 2025 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 429.00 mg/L | 301.00 | +43% | Mar 2025 | Open |
| Chloride | DMR, Limited - Numeric Violation | 285.00 mg/L | 211.00 | +35% | Feb 2025 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 232.00 mg/L | 211.00 | +10% | Jan 2025 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 240.00 mg/L | 211.00 | +14% | Oct 2024 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 410.00 mg/L | 301.00 | +36% | Aug 2024 | Open |
| Chloride | DMR, Limited - Numeric Violation | 410.00 mg/L | 211.00 | +94% | Aug 2024 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 460.00 mg/L | 211.00 | +118% | Jul 2024 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 460.00 mg/L | 301.00 | +53% | Jul 2024 | Open |
| Chloride | DMR, Limited - Numeric Violation | 550.00 mg/L | 211.00 | +161% | Jun 2024 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 550.00 mg/L | 301.00 | +83% | Jun 2024 | Open |
| Chloride | DMR, Limited - Numeric Violation | 240.00 mg/L | 211.00 | +14% | May 2024 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 300.00 mg/L | 211.00 | +42% | Mar 2024 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 255.00 mg/L | 211.00 | +21% | Feb 2024 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 410.00 mg/L | 301.00 | +36% | Jan 2024 | Open |
| Chloride | DMR, Limited - Numeric Violation | 410.00 mg/L | 211.00 | +94% | Jan 2024 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 530.00 mg/L | 301.00 | +76% | Dec 2023 | Open |
| Chloride | DMR, Limited - Numeric Violation | 530.00 mg/L | 211.00 | +151% | Dec 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 630.00 mg/L | 211.00 | +199% | Nov 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 630.00 mg/L | 301.00 | +109% | Nov 2023 | Open |
| Chloride | DMR, Limited - Numeric Violation | 740.00 mg/L | 211.00 | +251% | Oct 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 740.00 mg/L | 301.00 | +146% | Oct 2023 | Open |
| Chloride | DMR, Limited - Numeric Violation | 550.00 mg/L | 211.00 | +161% | Sep 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 550.00 mg/L | 301.00 | +83% | Sep 2023 | Open |
| Chloride | DMR, Limited - Numeric Violation | 360.00 mg/L | 301.00 | +20% | Aug 2023 | Open |
| Chloride | DMR, Limited - Numeric Violation | 360.00 mg/L | 211.00 | +71% | Aug 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 220.00 mg/L | 211.00 | +4% | Jul 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 370.00 mg/L | 301.00 | +23% | Jun 2023 | Open |
| Chloride | DMR, Limited - Numeric Violation | 370.00 mg/L | 211.00 | +75% | Jun 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 267.00 mg/L | 211.00 | +27% | Feb 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 240.00 mg/L | 211.00 | +14% | Jan 2023 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 295.00 mg/L | 211.00 | +40% | Dec 2022 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 214.00 mg/L | 211.00 | +1% | Nov 2022 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 253.00 mg/L | 211.00 | +20% | Oct 2022 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 326.00 mg/L | 211.00 | +55% | Jun 2022 | Resolved |
| Copper, total recoverable | DMR, Limited - Numeric Violation | 0.05 mg/L | 0.03 | +76% | Jun 2022 | Open |
| Chloride | DMR, Limited - Numeric Violation | 326.00 mg/L | 301.00 | +8% | Jun 2022 | Open |
| Chloride | DMR, Limited - Numeric Violation | 214.00 mg/L | 211.00 | +1% | Apr 2022 | Resolved |
| Chloride | DMR, Limited - Numeric Violation | 445.00 mg/L | 301.00 | +48% | Mar 2022 | Open |
| Fluoride, total [as F] | DMR, Limited - Numeric Violation | 8.60 mg/L | 3.60 | +139% | Mar 2022 | Open |
| Chromium, hexavalent dissolved [as Cr] | DMR, Limited - Numeric Violation | 0.04 mg/L | 0.02 | +160% | Mar 2022 | Open |
| Chloride | DMR, Limited - Numeric Violation | 445.00 mg/L | 211.00 | +111% | Mar 2022 | Resolved |
Enforcement Actions
Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.
Administrative - Formal
· Case 07-1989-0252
$0
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-001 · Jun 5, 2013
Administrative - Formal
· Case HQ-2001-3024 · Jun 29, 2001
Administrative - Formal
· Case HQ-2000-3091 · Sep 29, 2000
$5,000
Administrative - Formal
· Case 07-1999-0172 · Apr 16, 1999
$11,000
Administrative - Formal
· Case 07-1996-0237 · Jul 31, 1996
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-000 · May 5, 1994
CWA 309A AO For Compliance
Clean Water Act
· Case 07-1992-N001 · Feb 5, 1992
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-008 · Jun 27, 1991
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-007 · Feb 1, 1991
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-006 · May 22, 1990
FINAL 3008(H) I.S. CA ORDER
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-003 · Sep 28, 1989
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-005 · Mar 15, 1989
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-004 · Nov 17, 1987
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-MOD001700673-002 · Jul 1, 1987
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