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Audit finds Gilbert water meters accurate for 97% of accounts; town and auditor outline fixes for 2.9% of anomalies
Summary
A third-party audit of Gilbert’s water metering system found that 97.1% of accounts recorded usage accurately from 2020–2025, while about 2.9% experienced at least one anomaly. The town and auditor said they will validate account-level impacts and work to correct billing errors and multiplier settings.
Kimley Horn, an engineering firm hired to audit Gilbert’s water metering system, told the Town Council on April 7 that its review of physical meters, radio transmitters and six years of billing data (Jan. 2020–Dec. 2025) found no systemwide failure but did identify targeted anomalies affecting roughly 2.9% of active accounts.
“Today we can validate that there are no systemwide issues,” Kimley Horn project manager Tyler Kay said, adding that “97.1% of all accounts were recording usage and billing accurately during the audit period.” The auditor said the most common problems were multiplier configuration errors, billing code mistakes, rounding and isolated meter accuracy issues.
The audit tested a statistically representative sample of the town’s meters and radios and shipped 451 meters for off‑site laboratory testing, achieving a 98% confidence level for those samples. Kimley Horn reported that radio transmitters performed well (over 99% reporting correctly)…
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