CaliforniaWaterLoss.com

How much treated water California utilities lose

Every urban retail water supplier in California files an annual AWWA water-loss audit with the Department of Water Resources. This is all 4,919 published audits, normalized to one volume unit and reduced to the measures utilities actually manage against.

Systems
609

595 mapped

Audits
4,919

2015–2025

Median real loss
26.8

gal / conn / day

Real loss 2025
4.45B gal

7.1% of water supplied

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Real loss · gallons per service connection per day

Under 1515 – 2727 – 5050 – 9393 and aboveNot calculable

Circle size reflects service connections. Bands are statewide quartiles of the most recent audit — descriptive, not a compliance judgement.