Pentair plc (PNR) is an American water treatment company incorporated in Ireland with tax residency in UK, with its main U.S. office in Golden Valley, Minnesota.

[8] Now the company's primary focus is on residential, commercial, industrial, municipal and infrastructure and agriculture applications.

The only remaining founder, Murray Harpole, brought in an outside investor, Ben Westby and they set about purchasing Peavey Paper Mills, Inc.

In 1999 under chairman, president, and chief executive officer, Winslow H. Buxton, Pentair made a series of acquisitions.

The botched opening of its new corporate office and distribution center in Jackson caused an immediate drop in revenue as the shipping facility encountered numerous issues.

It expanded its production in Taiwan and started to negotiate with the union of its Delta manufacturing facility to reduce payroll.

In July 2004, Pentair bought WICOR Industries, the former water systems subsidiary of Wisconsin Energy, for $850 million.

[19] WICOR made water pumps, filters, and pool equipment components under the Sta-Rite, SHURflo, and Hypro brands.

This broadened Pentair's technical products line to include markets outside of the traditional electrical and electronics businesses.

In 2006, Pentair purchased Germany-based Jung Pumpen GmbH,[23][24] which makes pumps and other products for wastewater processing.

[25] Other acquisitions in 2005 and 2006 included Acu-Trol, Inc.,[26] Delta Environmental Products, selected assets of Krystal Klear, and a 70% stake in Beijing Jieming Tiandi Environmental Equipment (which was later renamed to Beijing Pentair Water Jieming), which produces fiberglass-reinforced pressure tanks and filters.

The company has announced an agreement to acquire water filtration and separation firm Porous Media for approximately $225 million.

The new company is described as a global manufacturer of “water and fluid solutions, valves and controls, equipment protection and thermal management products".

In August 2016, Pentair announced that it has entered into an agreement to sell the Valves & Controls business to Emerson, an American diversified global industrial company based in St. Louis, Missouri.