Ag Well Pumping Costs in the Central Valley: Where the Efficiency Is

California has more irrigated land than any other state: USDA's 2023 irrigation survey lists 7.8 million acres, out of 53.1 million nationwide. On many of those acres, the electric bill for the pump is one of the biggest costs of getting water to the crop. This guide covers where pumping money goes and which fixes are worth asking about.

Why pumping costs add up

Pumping energy depends on how much water you lift and how much pressure the system needs downstream. California Department of Food & Agriculture figures cited by the Ag Water Stewards program say agriculture uses nearly 8% of the state's energy, and about 70% of that goes to water pumping. The same page gives a range of 170 to 600 kWh per acre-foot for groundwater pumping, with an estimate of 431 kWh per acre-foot for the Tulare Lake region.

Your own number depends on your well, your depth to water and your system pressure. Treat those figures as context, not a prediction for your farm.

Start with a pump test

A pump test measures flow, pressure and power draw, and shows how efficiently the plant converts electricity into water delivered. According to Ag Water Stewards:

PG&E's Advanced Pump Efficiency Program, run through CSU Fresno's Center for Irrigation Technology, subsidizes over 2,400 pump tests per year and offers cash incentives for retrofits.
SDG&E offers a no-cost pump test for agricultural and non-residential customers with pumps of 20 horsepower or more.
SCE offers free pump testing.

Program terms change. Call your utility's agricultural representative to confirm what is available for your account before you schedule anything.

Why efficiency drops over time

Cal Poly irrigation professor emeritus Charles Burt, writing in Ag Alert in February 2026, notes that efficiency falls from worn bearings, worn impellers and bowls, or from flow and pressure that have drifted since the pump was selected. A pump that is efficient in general may still be a poor match for your specific flow and pressure. Sometimes the fix is simply replacing the pump with one chosen for today's duty point.

Reduce drawdown and sand

Burt recommends cleaning the well to reduce drawdown, using hydrojetting followed by chemical treatment, and says overpumping to "develop" a well is much less effective. Cleaning screens can also reduce sand pumping, which extends the life of bowls and impellers. Less drawdown means less lift and more flow.

Look at system pressure

Pressure is a cost you pay every hour. In Burt's example, a new moderate-size drip system on a flat field can often drop from a standard 40 to 45 psi discharge to about 25 psi with well-selected valves, emitters, filters and pipe. He says a 25 psi booster at the same flow should draw about 55% of the power of a 45 psi booster. He also says a 20% pressure reduction with a matched pump cuts demand charges and kilowatt-hours by about 20%.

Two cautions from the same article:

Do not cut pressure so far that distribution uniformity suffers. Some microsprinklers lose pressure compensation below 20 to 25 psi.
On an existing system, lower-pressure valves alone may not cut the bill if the pump stays the same, because the extra pressure is simply wasted elsewhere.

Note that the Burt article covers irrigation pumping in general, not wells only.

Variable frequency drives (VFDs)

A VFD can match a pump to changing load. Ag Water Stewards says VFDs can reduce energy use by matching flow to load and can reduce mechanical wear by ramping up slowly. Burt adds that on an oversized pump a VFD can lower pressure and kilowatts, but it adds electrical losses of its own. He suggests getting a written guarantee of total packaged efficiency of no less than 94% at full-load conditions. VFD selection and wiring need a licensed professional.

Check your electric rate

Burt's hypothetical fields show that cost per acre and cost per psi differences between rate options can be substantial. Ask your utility representative to compare rate schedules using your own pumping hours and demand, since the best option depends on your pattern.

Questions to ask a dealer

What are the tested flow, pressure and overall plant efficiency today?
Is the pump the right size for current duty, not the original one?
Would cleaning the well cut drawdown?
What does a VFD add, and what guarantee comes with it?
Who does service during peak season, and how fast?

See equipment in person

World Ag Expo runs February 9-11, 2027 in Tulare, California, a good place to meet pump dealers and compare options.

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General information only. Have a qualified pump dealer, well contractor and licensed electrician confirm sizing, electrical work and rate choices for your site.