33 CFR §151.1512

1. (a)To discharge ballast water into the waters of the United States, the master, owner, operator, agent, or person in charge of a vessel subject to § 151.1510 of this subpart must either ensure that the ballast water meets the ballast water discharge standard as defined in § 151.1511(a), use an AMS as provided for under § 151.1510(a)(1) or ballast exclusively with water from a U.S. public water system, as described in § 151.1510(a)(4), according to the schedule in paragraph (b) of this section.
2. (b)Implementation Schedule for the Ballast Water Management Discharge Standard for vessels using a Coast Guard approved BWMS to manage ballast water discharged to waters of the United States. After the dates listed in Table 151.1512(b), vessels may use a USCG-approved BWMS and comply with the discharge standard, or employ an approved ballast water management method per § 151.1510(a)(1) and (4).