Tierra Mesa Water Bills Surge While Uranium Fix Remains Unverified

A Tierra Mesa household using 10,000 gallons a month would have paid $26.25 under the old water rates. Under the rates that took effect December 1, 2025, the same consumption costs $104.98, including a temporary rate-case surcharge, before taxes or additional fees.

That calculation helps explain the anger in the Yuma County neighborhood, where residents describe bills reaching hundreds of dollars while a documented uranium problem remains unresolved in the public records reviewed for this story. Attorney General Kris Mayes has asked state utility regulators to reopen Cactus State Utility Operating Company's rate case and find relief.

One resident, Blenda Dale, told Arizona's Family she received a $398 bill. That is a reported household bill, not a standard charge for every customer. Yuma Informed has not obtained her invoice or meter readings to independently establish its components. The station's report was published September 30, 2026, despite its October 1 URL.

What the same amount of water costs

Decision 81549 records Tierra Mesa's previous residential charge as $13.25 a month, plus $1.30 per 1,000 gallons through 25,000 gallons and $2 above that threshold.

For a 5/8-by-3/4-inch or 3/4-inch residential meter, the approved South Group tariff now charges $32.64 a month, with no water included. Consumption costs $5.98 per 1,000 gallons for the first 3,000, $7.48 for the next 9,000 and $8.22 above 12,000. A separate $2.04 monthly rate-case expense charge ends after three years or earlier if the authorized $335,000 is recovered.

Using those schedules, these are monthly water-only comparisons at identical consumption. The new totals include that $2.04 charge; both columns exclude taxes, wastewater, penalties and other fees:

• 3,000 gallons: $17.15 before; $52.62 now, an increase of 206.8%.
• 10,000 gallons: $26.25 before; $104.98 now, an increase of 299.9%.
• 12,510 gallons: $29.51 before; $124.13 now, an increase of 320.6%.
• 17,424 gallons: $35.90 before; $164.53 now, an increase of 358.3%.

The last example uses the consumption in Cactus State's Tierra Mesa customer notice. Its advertised $162.49 new bill excludes the separately disclosed surcharge. Larger meters have higher fixed charges: a one-inch meter starts at $81.60 before consumption.

There is no single percentage that describes every bill. Usage, meter size, billing periods and additional charges matter. The calculations show the effect of changed rates without assuming that a particular customer's usage stayed constant.

What the Commission approved

The utility opened the docket with a notice of intent September 16, 2024. Its full application followed October 15, seeking increases for 24 water systems and two wastewater systems. The initial water proposal sought approximately $4.48 million in annual revenue, a 187.13% increase over test-year revenue. That utility-wide revenue request was not a percentage increase for every customer.

Commission staff recommended grouping the water systems into North and South regions, rather than one statewide group. Staff's initial South Group recommendation would increase annual revenue by about $1.29 million, or 139.47%. Staff and the company later negotiated a settlement, which the Commission approved with modifications. Regulators reviewed operating costs, asset values, financing assumptions and rate design to determine what customers would pay. The final order approved an 8.25% overall return and found the resulting rates just and reasonable. Mayes is asking the Commission to revisit that decision.

All five commissioners voted for the amended proposal November 6, 2025. The order also required service-related filings, including a Tierra Mesa plan to reduce water loss below 15% within one year and an emergency operations plan within 150 days. These were regulatory obligations, not proof that every underlying problem had been corrected.

Notice of the proceeding and notice of the final prices were different events. The order records hearing notices mailed in January 2025. In a December 22 compliance filing, Cactus State said it mailed notices of the approved prices December 16, after the December 1 effective date. The Commission had required notice with the next scheduled billing, by email where applicable and on the company's website. The filing establishes the company's stated mailing date; it does not establish receipt by every household or a legal finding that notice was inadequate.

The uranium record goes beyond one sample

Tierra Mesa's 2025 consumer confidence report lists a uranium running annual average of 33.77 micrograms per liter, with reported sample results ranging from 30.8 to 36. It records uranium-limit violations for the first three quarters of 2025, monitoring failures for the first and fourth quarters, and public-notification violations during two periods that year. Those are distinct failures: missing tests leave gaps in knowledge even when other samples are available.

A company notice hosted by ADEQ and dated June 4, 2026, identifies another violation for April through June. It reports a quarterly level of 30 micrograms per liter and an annual average of 33.6, above the federal limit of 30. The notice does not identify the individual sample dates behind that average. ADEQ's separate status sheet lists the system as exceeding the rule limit, with facility improvement in process, but provides no update date. Neither document establishes today's level at every tap.

EPA lists increased cancer risk and kidney toxicity among potential effects of long-term exposure above the uranium standard. It identifies erosion of natural deposits as a source. The records reviewed do not establish industrial contamination or illness caused by Tierra Mesa's water.

The notice describes the situation as non-emergency, says boiling is unnecessary and advises people with particular health concerns to consult their health-care providers. It says free alternative water remains available at a keyed kiosk on East Cecelia. That is the company's account of availability, not an independent inspection. The residents' petition alleges that the kiosk is frequently empty.

Investment promised, completion still to be shown

The uranium problem preceded Cactus State's ownership. Acquisition Decision 78374 describes an ADEQ consent order effective April 7, 2021, and a $230,000 asset-sale agreement signed March 12 that year. The Commission approved the transfer in December 2021. Cactus State operates within a chain of CSWR companies described in the later rate order.

Cactus State's rate notice says it invested approximately $5.5 million across its Arizona communities. That is a company-wide claim, not a Tierra Mesa construction ledger. In Arizona's Family's follow-up, published October 8, company president Josiah Cox said electrical, mechanical and underground improvements can be difficult for residents to see.

There is documentary evidence of specific work elsewhere: the rate settlement recognized a restored Q Mountain well at $50,550 before depreciation and a refurbished Harrisburg tank costing $14,850. Sharing costs across systems was part of the approved rate design. Neither project demonstrates that Tierra Mesa's uranium treatment is operating.

A February 19, 2025, WIFA board agenda listed consideration of a $1,084,125 Tierra Mesa loan. The June 2026 notice says financing terms were approved, treatment was designed and ADEQ approvals were still being sought before construction. An agenda, a financing statement and a design do not establish loan disbursement, finished construction or permission to operate. Yuma Informed did not locate those completion records or a verified treatment start date.

What regulators can do next

Mayes' September 22 letter, docketed September 24, cites a petition from 75 Tierra Mesa residents received by her office April 20. She argues that Arizona law requires a hearing on a qualifying rate complaint signed by at least 25 consumers. Another statute allows the Commission, after notice and an opportunity to be heard, to rescind or amend an earlier decision.

The petition seeks corrective action, reliable interim drinking water, independent verification of improvements, restrictions on increases and credits or refunds. Those are requested remedies. Reopening the case would not automatically lower rates or award refunds.

As of October 11, the reviewed docket showed no subsequent decision changing these rates or scheduled hearing on Mayes' request. KYMA reported October 1 that Chairman Nick Myers was working with Yuma County on a virtual town hall; Cox later described plans for community meetings. Neither report supplied a firm meeting date.

Customers can compare their meter size and consumption with the posted tariffs, ask Cactus State to explain disputed charges and use the Commission's Consumer Services complaint process if the dispute remains unresolved. The next evidence that matters is concrete: a Commission response to the hearing request, dated compliance results and records showing when Tierra Mesa's treatment actually enters service.