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FAQs

Frequently asked questions

What cities do you provide service?

🌽 Iowa
Anamosa, Bettendorf, BlueGrass, Camanche, Cedar Rapids, Clinton, Coralville, Davenport, Dewitt, Dubuque, Durant, Eldridge, Fairfax, Fruitland, Hiawatha, Iowa City, LeClaire, Long Grove, Marion, Muscatine, North Liberty, Palo, Parkview, Princeton, Riverdale, Robins, Tiffin, Wilton.

🌱 Illinois
Annawan, Atkinson, Coal Valley, Colona, Cordova, Dixon, East Dubuque, East Moline, Erie, Fulton, Galena, Galesburg, Genesco, Hampton, Milan, Moline, Monmouth, Orion, Port Byron, Prophetstown, Rock Falls, Rock Islands, Sherrard, Silvis, Sterling, Tampico.

🧀 Wisconsin
Hazel Green, Platteville, Shullsberg.

Not on the list? Give us a call!

 
RainMaster offers seasonal maintenance contracts designed to keep your irrigation system running at its best year after year. Contracts are sent out at the beginning of the season and must be purchased and renewed annually. The basic package includes a Spring Start-Up and Winterization Combination, with the option to add a Mid-Season Check and/or Backflow Test for extra protection and peace of mind.
 
If you haven’t received your contract, call us today — we’ll be happy to get you set up.
A backflow preventer is a safety device installed on your irrigation system that stops water from flowing backward into your home’s drinking water supply. Without it, contaminated water from your lawn — like fertilizers, pesticides, or dirt — could siphon back into the clean water lines.
 
Backflow preventers are required by law in Iowa and Illinois, and yearly testing is required and ensures they’re working properly to keep our water safe. RainMaster is fully certified in Iowa to test, repair, and replace backflow preventers, and we submit all records directly to the water providers for your convenience.
The State of Iowa requires annual backflow testing to protect public drinking water from contamination. Because your sprinkler system connects directly to your home’s water line, there’s a risk that fertilizers, pesticides, or other contaminants could flow backward into the clean water supply. By law, this testing must be performed by a certified professional.
 
RainMaster is fully certified in Iowa to provide backflow testing, submit the results directly to your water provider, and repair or replace backflow preventers if needed — making compliance simple and stress-free.
Yes — in the Midwest, winterization is essential to protect your irrigation system from freezing temperatures. When water is left in the lines, it can expand as it freezes, causing cracked pipes, broken valves, and costly repairs.
 
Winterizing your sprinkler system ensures all water is cleared out and your system is safely shut down until spring. RainMaster offers professional winterization as part of our seasonal services and maintenance contracts, giving you peace of mind that your system will be ready to go when the warm weather returns.
The best time to winterize your sprinkler system is in the fall — typically from mid-September through mid-November, before the first hard freeze. This timing ensures your system is cleared of water and protected from freezing temperatures.
 
RainMaster recommends scheduling your winterization early in the season to guarantee a spot and avoid last-minute rushes once the cold weather sets in.
While it may be tempting to try, we don’t recommend winterizing your irrigation system on your own. Proper winterization requires specialized equipment to blow compressed air through the lines and remove all water. Using the wrong air pressure can actually damage your sprinkler system, and if any water is left behind, it can freeze and cause cracked pipes, broken valves, and costly repairs.
 
RainMaster’s technicians have the right tools and experience to safely and thoroughly winterize your system, protecting it from winter damage and ensuring it’s ready for spring.
We recommend scheduling your sprinkler system’s spring start-up in early to mid-spring, once the risk of freezing temperatures has passed — typically Mid March through early May. Starting your system at the right time ensures your lawn and landscape get the water they need as the growing season begins, without risking freeze damage from turning it on too soon.
 
To guarantee your preferred appointment time, it’s best to schedule your spring start-up early in the season. RainMaster offers spring start-up as part of our seasonal services and maintenance contracts for added convenience.
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