By Matthew Holloway |

A quiet battle has been raging over the groundwater of the Hualapai Basin between Arizona State Representative John Gillette (R-LD30) and Mohave County Board of Supervisors Chairman Travis Lingenfelter.

Gillette has alleged that Lingenfelter enjoys the support of Governor Katie Hobbs, and High Ground, LLC., a firm “closely tied to the Walton Family Foundation and Environmental Defense Fund.”

In an email to AZ Free News, Rep. Gillette stated that Lingenfelter “has ‘cozied up’ with Governor Hobbs and High Ground, LLC., not by joining their party, but by aligning on a policy platform that places rural water in the hands of the Governor. He has advocated for several of the leftists’ water bills that trample the rights of property owners.”

The controversy appears to have arisen around the Final Assessment of the Hualapai Basin Water Data Integrity issued by Gillette to fellow legislators and third-party reviewers, which was allegedly made public by Lingenfelter in a May 8, 2025, formal rebuttal.

In his final assessment, Gillette wrote, “After continued research, legislative engagement, and review of both historical and current data, my original 2021 assessment of the Hualapai Basin water situation remains valid. The data presented by the City of Kingman and Mohave County remains suspect, with indications of overstatement used to drive political narratives and policy agendas.”

In the assessment, which Rep. Gillette asserted was reviewed by “three independent scientific and policy bodies prior to publication,” he found:

• The Hualapai Basin has enough groundwater storage to supply the region for 100–300+ years, even under heavy usage.
• Forecast models were based on worst-case pumping assumptions and should not be used to justify alarmist policy actions.
• Recharge estimates, storage volumes, and historical withdrawal rates all point to significant long-term water availability.
• The City of Kingman and Mohave County appear to have overstated risks—possibly to justify control over water rights or block agricultural competitors.

In the formal rebuttal dated May 8th, Lingenfelter addressed Gillette and claimed, “Your letter unfortunately contains a series of flawed assumptions, technical inaccuracies, and mischaracterizations that misinform rather than advance the public dialogue around long-term rural groundwater sustainability in Mohave County.”

He added, “Your letter asserts that data presented by Mohave County and the City of Kingman remains ‘suspect’ and ‘politically compromised.’ Such a characterization is categorically false and impugns the reputations of Mohave County, City of Kingman, and credentialed hydrologists at the ADWR and USGS and the public they serve.”

Responding to Lingenfelter’s rebuke in a formal response on May 16th, Gillette wrote, “While I welcome constructive dialogue, your letter reflects a degree of emotional overreach rather than a calm, scientific response to the concerns raised. Unfortunately, it reveals more about political defensiveness than about data transparency or hydrological best practice.”

Responding to critiques of the assessment’s findings Gillette wrote, “The assessment I authored was reviewed by three independent scientific and policy bodies prior to publication. All concluded that the findings were as accurate as possible given available data. I welcome peer review. What I reject is politically motivated resistance to scrutiny. As further evidence of bias, it should be noted that the ‘comparison document’ you reference—submitted by your team only days after my final assessment—contains several confirmations of my position.”

Rep. Gillette pushed back on Lingenfelter’s assertions based on the MODFLOW-NWT model from the U.S. Geological Survey and its 75,586 adjustable parameters writing, “As any trained analyst knows, such complexity magnifies sensitivity. Even small changes in assumptions—especially politically influenced assumptions—can result in dramatic shifts in outcome. Your confidence in the model would carry more weight if you supported my proposal to recalibrate baseline figures using 15 new field test sites with controlled, non manipulated measurement inputs. This is the kind of ground-truth methodology science demands. Strangely, your rebuttal ignores this recommendation entirely.”

He further strongly criticized the veto of a bill to cap irrigation on an irrigation non-expansion area (INA) by Governor Katie Hobbs, saying the veto “executed without explanation—is further evidence that political goals are outweighing scientific governance.”

AZ Free News reached out to Supervisor Lingenfelter for a comment and received the following reply:

Thank you for reaching out. I am not aware of any dispute or controversy between the Mohave County District 1 Office and Representative Gillette’s Office as you phrase it. As Mohave County Supervisor for District 1, I have served as Mohave County’s lead on water issues for the past five years, and was actively involved in our local water policy advocacy during my prior four years on the Kingman City Council.

My responsibility is to represent the shared, official position of both Mohave County and the City of Kingman, guided by the most accurate and credible data and hydrological modeling available, based on a multi-year, science-based partnership between Mohave County, the City of Kingman, and the United States Geological Survey (USGS)—an independent agency with a long-standing reputation for being the gold standard of scientific water modeling.

The ‘Final Assessment of the Hualapai Basin Water Data Integrity’ issued by Rep. Gillette is his office’s interpretation. The County and City remain firmly grounded and unified in the professional peer-reviewed science and long-term hydrological data and modeling that have guided our efforts to protect rural groundwater and ensure sustainable water use for future generations.

As always, Mohave County, City of Kingman, and USGS look forward to jointly collaborating with all legislators on our water issues on behalf of our rural communities.”

Based upon his team’s findings, Rep. Gillette has announced his intention to pursue “a stand-alone Hualapai Basin bill—developed outside of executive influence—that reflects the data as it exists, not as it is manipulated.”

Editor’s Note: Following the filing of this report, AZ Free News was contacted by Nick Ponder, Senior Vice President of Government Affairs of HighGround Public Affairs. Mr. Ponder provided the ’Analysis of Water Constraints and Economic Growth,’ a report prepared for Mohave County by Rounds Consulting Group, and the formal rebuttal issued on May 8th by Chairman Lingenfelter to Rep. Gillette with the note: “The County, City, and USGS have been very transparent in the processes and data used in determining the water situation in the Hualapai Valley Basin. The letter and the attached analysis should reflect that robust and transparent process.”

Matthew Holloway is a senior reporter for AZ Free News. Follow him on X for his latest stories, or email tips to Matthew@azfreenews.com.