Let's play sea lawyer. Or, gee, why not see what the USCG itself has PUBLISHED AS ACCEPTABLE?
No discharge zone.
While operating a vessel in an EPA designated no discharge zone, flow-through devices are only permitted if adequately secured to prevent discharges of all treated and untreated sewage. For example, closing the seacock and padlocking, using a non-releasable wire tie, or removing the seacock handle are considered to be sufficient in most cases. For short voyages, locking the door to the head with a padlock or a door handle key lock is another acceptable method.
For vessels that routinely operate in no discharge zones a Type III MSD is recommended. For more information see 33 CFR 159.7 and 40 CFR Part 140. "
From USCG Systems Engineering Division (CG-5213)
Yes, let's try to grasp this concept
. It doesn't matter who thinks otherwise, the USCG has officially documented "locking the compartment door" is sufficient to secure whatever is inside it.
Anyone got a problem with what "secure" means, you direct them to the Commandant, USCG. A tie wrap, baling wire, or padlock on the seacock itself is no more secure than a LOCK ON THE DOOR.
You think it is? I got tools that say elsewise.