On September 11, 2018, MS Westerdam was visiting the national park when a crew member aboard the ship mistakenly opened the wrong valve, according to the notice of violation of the state. Around 22,500 gallons of untreated water leaked into the park. The discharge lasted 25 minutes and was reported to authorities.
Greywater is an untreated runoff, usually from kitchen and cleaning use. It is less hazardous than wastewater which contains human waste.
Cruise liners are prohibited from discharging anything within national park boundaries. The Glacier Bay NP Service fined the company US$250 over the wastewater dumping.
For other MS Westerdam accidents and incidents see at the ship's CruiseMinus page.