Reports have shown no decline in the health of the river since initial testing in 2010.

The card was last week launched by Environment, Parks and Heritage minister Brian Wightman at the Tamar Island Wetlands Centre.

NRM North chief executive officer James McKee said the card showed a significant achievement in the health of the estuary.

"The report shows some pleasing results with the mouth of the Tamar estuary described as being in excellent condition," Mr McKee said.

"This zone was given an A, indicating excellent recreational water quality with guidelines met all of the time."

Twenty monitoring sites from Kings Bridge near Launceston to Hebe Reef in Bass Strait have been watched from October 2009 to September 2010.

TEER scientific and technical officer Michael Attard said the water quality near Launceston was poor, with higher levels of turbidity, nutrients and metals.

Water near the George Town and Bell Bay, Hillwood, Deviot and Beaconsfield areas received a B+ rating, with the mid-upper estuary near Dilston, Legana and Exeter received a B-.

The Tamar Estuary Report Card 2011 can be downloaded from the NRM North website at www.nrmnorth.org.au