WPBS-TV (channel 16) and WNPI-DT (channel 18) are PBS member television stations licensed respectively to Watertown and Norwood, New York, United States. Owned by the St. Lawrence Valley Educational TV Council, the stations maintain studios on Arsenal Street in Watertown. WPBS-TV's transmitter is located on Lewis County Route 194 in Denmark, New York, while WNPI's tower is in South Colton.

WNPI operates as a full-time satellite of WPBS; its existence is only acknowledged in station identifications. Aside from the transmitter, WNPI does not maintain any physical presence locally in Norwood.

The two stations service most of northeastern New York as well as Ottawa and Kingston, Ontario, Canada; their slogan "Your Two-Nation Station" reflects this Canadian audience.

The St. Lawrence Valley Educational Television Council, which was organized in 1958, originally produced educational television programming to be carried by local CBS affiliate WWNY-TV (channel 7). In 1971, it established a free-standing PBS station, WNPE-TV, using WWNY's original studios on Champion Hill as the commercial station had already relocated to a larger facility in Watertown. Full-time satellite WNPI-TV signed on a few weeks later. Outgrowing the Champion Hill location itself, WNPE moved to a new building in Watertown in 1978.

Because of its large Canadian viewership, WNPE was one of the more successful PBS stations, with fundraising totals often exceeding those of stations in much larger markets.

For a minor sum, the rights to use the WPBS call letters were purchased from a small radio station in Conyers, Georgia, in the late 1990s; the call sign change to WPBS-TV took effect on September 1, 1998. Following the shutdown of analog television signals, WPBS switched to a "-DT" suffix on July 2, 2009, as did WNPI; WPBS returned to the "-TV" suffix on March 11, 2020. Despite the calls, which mimic the callsign schemes used by stations owned by ABC, NBC and CBS in New York City and Los Angeles, WPBS-TV is not an owned-and-operated station (nor is similarly named KPBS in San Diego), as PBS cannot own or operate any of its member stations due to the network's local and non-profit nature; the WPBS callsign reflects the station's affiliation and programming, but not any special status within PBS.

Despite its strong viewership in Canada, Rogers Cable, the main cable provider in Ottawa, announced in July 2009 that it would replace WPBS on its systems with Detroit's WTVS by mid-August to provide a higher-quality PBS feed, as WTVS could be fed via fiber optic cable rather than from over-the-air signals. Shortly after receiving this news, a Facebook campaign called 'Save WPBS in Ottawa' (later renamed 'Ottawa Loves WPBS') urging Rogers to reconsider its decision to pull the station was launched, attracting hundreds of supporters, as well as local Ottawa politicians. On July 30, 2009, it was announced that WPBS would offer a fiber-optic feed of the station for Rogers transmitted from Buffalo, New York.

Erie, Pennsylvania's WQLN, which serves viewers in the London, Ontario area through Rogers, was also threatened with removal from the Rogers system; as with WPBS, WQLN offered a fiber connection with Rogers.