Three controller tweaks that cut summer water bills

High summer water bills often come from when and how your system waters, not from thirsty plants.

Research from Gardening Solutions at UF/IFAS shows three controller settings that cut summer water use: start times, run times by zone, and seasonal adjustment.

Start times reduce evaporation and runoff. Run times let you match each zone to plant and head type. Seasonal adjustment scales watering through the year.

We’ll give practical tips you can use in Tigard and the Portland metro. Plus simple checks and occasional professional tuning will protect those savings.

Schedule early starts and cycle‑and‑soak to reduce evaporation and runoff

Want lower summer water bills without changing your plants? Start by moving most watering to the cool part of the day and by breaking runs into short cycles.

Plan start times in the early morning, before mid‑morning when possible. Morning watering cuts evaporation and helps water reach roots instead of drifting away, according to local water guidance. Regional Water Providers.

If you see puddles or runoff, split that zone's total run time into multiple short cycles with soak pauses between them. The EPA calls this cycle‑and‑soak, and it helps slow soils absorb water instead of losing it to runoff. EPA cycle‑and‑soak guidance.

In Tigard, the city recommends watering before 10 a.m. or after 6 p.m., so early starts fit local rules and conserve water. Tigard water conservation

Run many zones at once and you may drop system pressure. Stagger station start times by several minutes so each zone gets full spray and avoids weak coverage.

On very hot days, keep the early start but use slightly shorter cycles with the same soak pauses. That gives roots water when they need it most and keeps your system efficient.

Small timing changes like these save water, protect turf, and shrink bills without extra work.

Set each zone’s runtime from a quick test and simple math

Tired of running every zone the same amount of time? That one-size-fits-all approach wastes water and raises bills.

Start by measuring precipitation rate, or PR. PR is the depth of water a zone applies per hour, and Rain Bird explains how that number links water depth to minutes.

Do a catch-can test to find PR

The easiest field method is a catch-can test. It shows both the zone's PR and any uneven coverage.

1. Place 10 to 20 straight-sided cans across the irrigated area so they sample head and midpoint coverage.
2. Run the zone for a set time, like 15 minutes, so you get measurable depths without long waits.
3. Measure each can in inches and average the depths to get the test depth.
4. Convert your test to an hourly PR by scaling. For a 15-minute run, multiply the average by four.
5. Repeat for every irrigation zone because each one usually sprays at a different rate.
6. This catch-can method comes from practical irrigation guidance and is quick to do at home.

Now translate PR into minutes. Use the runtime formula from the University of Florida IFAS to set a zone for a target depth.

Run Time in minutes equals desired water depth in inches divided by PR in inches per hour, then times 60. For example, if you want 0.5 inches and your PR is 1 inch per hour, run time is 30 minutes.

Adjust runtimes for head type and soil

• Spray heads apply water quickly over small areas, so their PR is higher and their run times are shorter.
• Rotor heads put out water more slowly over larger areas, so they need longer run times to deliver the same depth.
• Sandy soils drain fast and need more frequent but shorter cycles so water stays in the root zone.
• Clay soils absorb slowly and hold moisture longer, so you should lengthen soak intervals or split runs to avoid runoff.

Finally, group plants with similar needs into the same zone. Hydrozoning prevents overwatering drought-tolerant beds or underwatering thirsty lawns.

Test each zone, calculate runtimes, and then tune. Small adjustments like these cut waste and lower summer bills while keeping plants healthy.

Automate big savings with seasonal adjustment, smart weather modes, and sensors

Want lower water bills without babysitting your controller? Use the features that most controllers already have to let the system adapt for you.

Seasonal adjustment, sometimes called a water budget, scales all zone run times by a percentage so you can program for peak demand and reduce from there. Hunter's seasonal adjustment guide shows how this saves time and prevents reprogramming every month.

Use seasonal adjustment the smart way

Set your base program for the hottest month at 100 percent. Then drop the percentage as temperatures fall. That lets every zone run less without changing individual schedules.

During short heat waves, bump the percentage up a bit so plants get extra water when they need it. After the heat passes, return the percentage to normal so you avoid steady overwatering.

Let weather data and sensors stop wasted cycles

Weather‑based or ET controllers use local weather to calculate plant water needs and often cut outdoor use by about 20 to 50 percent compared with fixed timers. The EPA explains how smart controllers save water

Soil moisture and rain sensors tell the controller to skip a cycle when moisture is already enough. Extension resources on sensors and smart tech note that these sensors prevent unnecessary watering and protect plant health.

If your area has watering restrictions, switch to manual or set the controller to allowed days and rely on sensors to avoid illegal runs. The bottom line: combine seasonal adjustment, weather modes, and sensors and you get automated savings with healthy plants.

Do these quick system checks before reprogramming your controller

Changed your controller but the bill is still high? Before you blame the settings, run a few quick checks so your programming actually saves water.

• Walk each zone while it runs and watch for broken heads, tilted nozzles, misting, overspray onto pavement, dry patches, or pooling.
• Check for hidden leaks using your water meter: shut off all water, watch the low‑flow indicator, then turn off the irrigation main to see if the meter stops.
• Run a catch‑can test on each zone to measure precipitation rate and uniformity so you can set accurate run times.
• Look for clogged or wrong nozzles and make sure stations aren’t running at the same time if that drops pressure and weakens coverage.

These checks come from practical irrigation guidance and help you avoid wasting water when you tweak the controller. If heads are misaligned or coverage is uneven, changing run times won’t fix the problem.

Certain problems mean you should call a professional instead of guessing at repairs. Call a pro for electrical faults, persistent pressure or flow problems, hidden leaks, systemic uneven watering, major upgrades, or warranty concerns.

Do the walk, meter test, and catch‑can test first. Fixing hardware issues or getting expert programming will protect the savings you expect from smarter controller settings.

Keep the savings with simple checks and scheduled tune‑ups

Tuning start times, zone runtimes, and seasonal adjustment can cut summer water use and lower your bills.

Start times reduce evaporation and runoff. Zone runtimes match watering to head type and soil so you don’t overwater. Seasonal adjustment scales watering through the year without reprogramming each zone.

Do quick visual checks monthly during the active season, May through September. Then schedule a professional irrigation audit once a year before the season starts. Consider a fall review for winterization and to preserve those savings.

Best practices on energy.gov recommend monthly checks and an annual pre-season audit to maintain efficiency.

If you’d rather leave it to a pro, we can help. Pro Lawn Maintenance programs controllers and performs system audits in Tigard and the Portland metro.

Call us at (971) 770-8300 or read more about cost-effective lawn care in our guide at One-Time Clean vs Ongoing Lawn Program.