Clean Water Act discharge permit · NPDES IL0070122
MATHESON TRI-GAS INC, Mapleton, IL: NPDES IL0070122 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
MATHESON TRI-GAS INC, held by AIR LIQUIDE INDUSTRIAL US LP, holds NPDES permit IL0070122, which discharges to Pond Lily Lake Trib To Illinois Rvr. EPA’s file records it issued May 20, 2014 and expiring April 30, 2019. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MATHESON TRI-GAS INC |
|---|---|
| Permittee as filed | AIR LIQUIDE INDUSTRIAL US LP |
| NPDES ID | IL0070122 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | May 20, 2014 |
| Expiration date | April 30, 2019 |
| Address | Mapleton, IL 61547 |
| Receiving water | POND LILY LAKE TRIB TO ILLINOIS RVR |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lamarsh Creek (HUC 071300030303) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 8Pollutants on file
- 7Under a numeric limit
- 8With a violation of any kind
- 6With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Temperature, water deg. fahrenheit | 2 | 15 | 7 | February 28, 2026 | 22% over the limit |
| Solids, total suspended | 2 | 15 | 5 | April 30, 2008 | 277% over the limit |
| Chlorine, total residual | 1 | 13 | 5 | February 28, 2026 | 240% over the limit |
| Iron, total [as Fe] | 2 | 12 | 2 | February 28, 2018 | 10% over the limit |
| Chloride [as Cl] | 1 | 6 | 1 | December 31, 2004 | 159% over the limit |
| Solids, total dissolved- 180 deg. C | 0 | 2 | 1 | December 31, 2004 | 148% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 16 | 0 | ||
| pH | 2 | 14 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES IL0070122.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID IL0070122 there.
Nearby on the register
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- Every permit record in Mapleton, A to Z
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- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.