An Indianapolis sprinkler system should zone lawn and beds separately, run short cycles so clay can absorb water, and water early in the morning one to two times a week, as Citizens Energy Group recommends. Indiana requires the backflow device to be tested every year by an IDEM-certified tester, and the system needs winterizing each fall.
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Indianapolis gets plenty of rain in an average year, but it doesn't arrive on schedule. Spring is often wet, while July and August can go weeks with little rain, and that's when bluegrass lawns go brown and new plantings struggle. A well-designed sprinkler system covers those gaps. A poorly set one runs in the rain, floods clay soil and drives up water bills, and in dry summers lawn watering is a big reason local utilities ask customers to cut back.
How much and when to water
Citizens Energy Group, the main water utility for Indianapolis, says most Indiana lawns only need watering one to two times a week, and that early morning (it suggests 4 to 7 a.m.) is the best time to water to reduce evaporation. Indiana American Water, which serves communities such as Noblesville and Greenwood, gives similar advice to water early or late, not midday. During hot, dry spells, utilities may ask for voluntary conservation, such as watering on set days. Check your own utility's current guidance, since rules can change during a drought.
Backflow testing is required
Any sprinkler system connected to public water needs an approved backflow prevention assembly to keep lawn water and chemicals out of the drinking water. In Indiana, those devices must be tested every year at the owner's expense by a backflow tester certified by the Indiana Department of Environmental Management (IDEM). Citizens Energy Group requires testers to register with its backflow program administrator and submit results online, and it says annual testing applies even if a connected system isn't being used. Other utilities, such as Carmel Utilities and Indiana American Water, run their own programs, so ask your installer what your provider requires. Testing is usually done when the system is turned on in spring.
Winterizing
Indianapolis winters freeze the ground, so sprinkler lines, valves and the backflow assembly need to be drained or blown out each fall. A cracked backflow device in spring is a common, avoidable repair. Ask whether winterizing and spring start-up are included in a service plan.
Types of systems
- Rotors: for larger lawns; their slower application rate suits clay.
- Spray heads: for small or narrow areas.
- Drip irrigation: for beds, foundation plantings and new trees, with little runoff.
- Smart controllers and rain sensors: adjust or skip watering based on weather. EPA's WaterSense program labels controllers that meet its efficiency criteria.
Design for clay
Clay absorbs water slowly, so long run times create runoff. Good systems zone lawn and beds separately, separate sun from shade, and use several short cycles (cycle and soak) so water sinks in. Watering deeply and less often encourages deeper roots in bluegrass and tall fescue.
Licensing
We weren't able to confirm a separate statewide irrigation contractor license in Indiana. Backflow testing requires IDEM certification, connections to the water line may involve plumbing rules, and some cities require local permits or contractor registration. Ask your city or water utility what applies.
Common repairs
- Broken heads from mowers and snow plows along driveways
- Freeze damage to backflow assemblies and shallow pipe
- Leaking valves, often noticed as a soggy spot or high bill
- Controllers never adjusted from summer to fall schedules
Questions to ask
- How will you zone the system, and will beds use drip?
- Is a smart controller or rain sensor included?
- Who handles the backflow test and reporting to my utility?
- What do winterizing and spring start-up cost, and what's the warranty?
Need a new system or a repair? Request an irrigation company, or read our guide to sprinkler systems, backflow tests and watering in Indianapolis.
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Frequently asked questions
Do I have to test my sprinkler backflow every year in Indiana?
Yes. Backflow devices must be tested annually at the owner's expense by an IDEM-certified tester. Citizens Energy Group says this applies even if a connected system isn't being used.
Are there watering restrictions in Indianapolis?
Citizens Energy Group generally asks for voluntary conservation, recommending watering one to two times a week in the early morning. During droughts utilities may ask for more, so check your provider's current guidance.
When should I winterize my sprinkler system?
Before the first hard freeze, usually in fall. Lines, valves and the backflow assembly should be drained or blown out to prevent freeze damage.
Sources and further reading
- Purdue University Turfgrass Science
- Purdue Extension, Indiana Accredited Horticulturist: Turfgrass Management
- Purdue Extension Marion County: Soil Testing Labs
- Office of Indiana State Chemist: pesticide and fertilizer applicator licensing
- Indiana DNR: Terrestrial Plant Rule (312 IAC 18-3-25)
- Citizens Energy Group: Backflow Prevention
- Citizens Energy Group: Water conservation tips
- Indiana American Water: wise water use
- National Weather Service Indianapolis: climate normals
- USDA Plant Hardiness Zone Map
- EPA WaterSense
- Indiana 811: call before you dig