Clean Water Act discharge permit · NPDES MOG490004
LATHROP QUARRY, Lathrop, MO: NPDES MOG490004 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
LATHROP QUARRY, held by Martin Marietta Materials Inc, holds NPDES permit MOG490004, which discharges to Tributary To Little Platte River. EPA’s file records it issued August 1, 2022 and expiring April 30, 2027. 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 | LATHROP QUARRY |
|---|---|
| Permittee as filed | Martin Marietta Materials Inc |
| NPDES ID | MOG490004 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Industrial stormwater |
| Issued | August 1, 2022 |
| Expiration date | April 30, 2027 |
| Address | Lathrop, MO 64465 |
| Receiving water | Tributary to Little Platte River |
| Subwatershed | Grindstone Creek-Little Platte River (HUC 102400120703) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 6Pollutants on file
- 5Under a numeric limit
- 6With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| pH | 2 | 10 | 0 | ||
| Solids, total suspended | 2 | 10 | 0 | ||
| Solids, settleable | 2 | 10 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 10 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 6 | 0 | ||
| Storm water flow | 0 | 4 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MOG490004.
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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 26, 2026 | Permit Violations - Violation Specified in Comment | ST6 |
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 MOG490004 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.