Stephen Schwarzman’s UK Estate Draws Scrutiny After Tanker Deliveries During Local Water Restrictions

A dispute has erupted between neighbours, a water company and the owners of Conholt Park after residents reported an influx of tanker deliveries of water to the 2,500-acre Wiltshire estate owned by US financier Stephen Schwarzman.

Locals in neighbouring Hampshire filmed tankers filling at standpipes and driving to the estate, and some residents estimated as many as 30 tanker movements a day. Hampshire and parts of the Isle of Wight are subject to hosepipe bans and drought orders introduced by Southern Water late in July.

Southern Water said it was alerted by residents in Andover and noted a marked increase in commercial tanker activity drawing from standpipes that supply areas without piped water. Tim McMahon, the company’s managing director, said he was "appalled by this use of water" and asked the estate's operators to stop directing delivered supplies to the estate lake; the estate complied, Southern Water said. The company also said it will carry out a review to tighten monitoring processes and to examine potential legal loopholes that allow commercial extractions during restrictions.

A spokesman for Conholt Park said the water used during the renovation and construction phase of the estate had been "sourced through licensed providers responsible for the lawful and proper extraction and delivery" and that most delivered water was used to support building works and personnel. The spokesman said a sophisticated rainwater-collection system woven into the estate's drainage was designed to feed the new lake and that water purchased and transported to the site had come largely from locations outside the region.

"For the majority of the construction period, until approximately the last three weeks, water purchased and transported to the site by tankers was used principally to support the building works and associated personnel," the spokesman said. "Most recently, as construction winds down a proportion of transported water has been used in connection with irrigation and the lake. Following yesterday's request from Southern Water that water is not directed to the lake, the estate has readjusted the supply of water accordingly." The spokesman called suggestions that the owners had violated local water regulations "false and misleading." Southern Water said commercial tankers servicing the estate were operating within the law but that it would pursue conversations with the providers involved.

The controversy follows months of local concern about the creation and filling of a new three-acre lake at Conholt Park, which Schwarzman bought in 2022 for about £82 million. Neighbours and local landowners had previously written to estate managers asking for assurances that groundwater was not being abstracted to fill the lake and warned of possible impacts on a shared aquifer used by farms and private supplies.

Estate representatives have denied systematic use of a borehole to fill the lake, saying the planning documents submitted to Wiltshire Council detail how the lake will be filled by harvested rainfall and a drainage system that collects runoff from the main house, outbuildings and paved areas. They said groundwater extraction had occurred only in very limited circumstances�for example, when testing a new drainage system or because of a short leak caused by a faulty valve.

Residents who have monitored the tanker movements described them as frequent and at times nocturnal. One local, Lawrence Leask, told reporters he rose before dawn to follow tankers, while another resident, Trevor Marshall, said he recorded each tanker passing his home. "It's incredibly outrageous," Marshall said, reflecting tensions among neighbours who are subject to restrictions on domestic water use, including hosepipe bans.

Southern Water supplies more than two million customers in Hampshire and the Isle of Wight and imposed both hosepipe bans and a drought order for parts of its area after reduced rainfall and persistent dry conditions. Under current regulations, licensed commercial tankers can extract water for non-domestic construction activity, a point relied upon by the estate and its suppliers in arguing the deliveries were lawful.

Schwarzman, 78, founded the private equity firm Blackstone and is among the wealthiest financiers globally. Sources close to him have highlighted his charitable donations in the UK, including contributions to the University of Oxford, while planning documents show the estate's restoration work includes landscaping, tree planting and measures for shooting activities that the owners say will be managed within guidance from conservation bodies.

Wiltshire Council approved the estate's blueprint last year, and the estate's spokesman said restoration and preservation of the listed property were being carried out with regard to planning regulations and a commitment to environmental stewardship. He also said shooting at Conholt Park would be limited to 28 days a year, compared with commercial shoots that run more frequently.

Southern Water said it was carrying out a "thorough review" to understand how the increased standpipe abstraction occurred and to consider how to prevent similar occurrences while reassuring customers that supplies will be protected. Blackstone, which is linked to Schwarzman, has been approached for further comment.

The episode has highlighted tensions that can arise when high-value restoration projects intersect with local resource pressures and regulatory regimes governing water use and abstraction. Southern Water's planned review will focus on monitoring and licensing arrangements for commercial tankers drawing from standpipes in areas subject to restrictions, the company said, and the estate says it has adjusted its water sourcing in line with the company's request.