Velarion Records
Follow this permit Velarion Records emails you this permit’s record, cited to the public filing, and tells you when the register changes it. Free.
We’ll email you a link to confirm. The continuous daily watch on every change is the paid alert. Unsubscribe any time.
Also free: The Pay Desk, the weekly executive pay briefing.

Clean Water Act discharge permit · NPDES SCR10Z4P6

RIVERSIDE MARINA AND DRYSTACK, Myrtle Beach, SC: NPDES SCR10Z4P6 discharge permit, effluent exceedances, inspections, penalties

RIVERSIDE MARINA AND DRYSTACK, held by Calvin Mason, MC & WKM, LLC, holds NPDES permit SCR10Z4P6. EPA’s file records it issued December 5, 2019 and expiring December 4, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for RIVERSIDE MARINA AND DRYSTACK: its NPDES ID, its permit type and status, its dates, its address in Myrtle Beach, South Carolina. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES SCR10Z4P6.

Identity

Facility as filedRIVERSIDE MARINA AND DRYSTACK
Permittee as filedCalvin Mason, MC & WKM, LLC
NPDES IDSCR10Z4P6
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedDecember 5, 2019
Expiration dateDecember 4, 2024
Issuing agencyState
AddressMyrtle Beach, SC 29588
SubwatershedSocastee Swamp-Atlantic Intracoastal Waterway (HUC 030402060906)

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

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES SCR10Z4P6.

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES SCR10Z4P6.

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

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, SCR10Z4P6.

Start the watch

How often?
  • One permit holder — $99/month
  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

How we handle your data → Privacy

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 SCR10Z4P6 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers NPDES permit SCR10Z4P6 for RIVERSIDE MARINA AND DRYSTACK in Myrtle Beach, SC, held by Calvin Mason, MC & WKM, LLC, and lists its status as administratively continued with a minor discharger class. The page shows 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance, and records no effluent violation for this permit.