Clean Water Act discharge permit · NPDES IN0001970

MATHESON TRI-GAS INC, Mount Vernon, IN: NPDES IN0001970 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
11Pollutants under a numeric limit
7Pollutants with an effluent exceedance

MATHESON TRI-GAS INC holds NPDES permit IN0001970, which discharges to Ohio R Via Smith Creek. EPA’s file records it issued October 21, 2016 and expiring October 31, 2021. 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	MATHESON TRI-GAS INC
NPDES ID	IN0001970
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	October 21, 2016
Expiration date	October 31, 2021
Issuing agency	IDEM
Address	Mount Vernon, IN 47620
Receiving water	OHIO R VIA SMITH CREEK
Subwatershed	Beaverdam Creek-Ohio River (HUC 051402020605)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

13Pollutants on file
11Under a numeric limit
13With a violation of any kind
7With 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	8	46	34	February 28, 2026	26% over the limit
Oil and grease, hexane extr method	3	14	9	April 30, 2026	64% over the limit
pH	6	42	5	December 31, 2016
Oil & Grease	0	15	5	March 31, 2006	300% over the limit
Solids, total suspended	4	16	3	January 31, 2004	206% over the limit
BOD, carbonaceous [5 day, 20 C]	2	18	2	April 30, 2002	136% over the limit
E. coli, MTEC-MF	0	2	2	May 31, 2000	380% over the limit
Flow, in conduit or thru treatment plant	4	36	0
Flow, total	4	16	0
E. coli, colony forming units [CFU]	2	10	0
Nitrogen, ammonia total [as N]	2	6	0
Chemical Oxygen Demand [COD]	2	1	0
Storm water flow	2	1	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 IN0001970.

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.

Watch this permit

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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 IN0001970 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers NPDES permit IN0001970 held by MATHESON TRI-GAS INC in Mount Vernon, IN, which discharges to OHIO R VIA SMITH CREEK within the Beaverdam Creek-Ohio River subwatershed (HUC 051402020605). The page lists the permit as administratively continued, with 11 pollutants under a numeric limit, 7 pollutants with an effluent exceedance, and 13 pollutants on file, as stood when the record was loaded on September 15, 2026.