Short answer: In New Jersey, (1) irrigation work must be done by a state-certified landscape irrigation contractor whose business holds a DCA permit, (2) automatic sprinkler systems installed after 2000 must have a rain sensor, and (3) commercial backflow preventers must be tested annually by a certified tester.
1. Certified contractor and business permit
New Jersey requires any business doing landscape irrigation work to hold a business permit and employ a certified landscape irrigation contractor. The program is run by the Board of Landscape Irrigation Contractors within the NJ Department of Community Affairs under N.J.S.A. 45:5AA and N.J.A.C. 5:62. A home improvement contractor registration does not substitute for it.
How to check: DCA publishes lists of certified contractors and valid business permits. You can also call (609) 984-7834 or email LIC@dca.nj.gov. DCA has warned consumers not to use uncertified contractors.
2. Rain sensors on automatic systems
Under N.J.S.A. 52:27D-123.13, automatic lawn sprinkler systems installed after P.L.2000, c.107 took effect must have a rain sensor device or switch that overrides the watering cycle when there's enough rain. We check rain sensors on every visit.
3. Annual backflow testing
Backflow preventers protect the public water supply from irrigation water. Commercial properties must have their devices tested annually by a certified backflow tester, with results filed with the water supplier and/or local authority. Ocean Township, for example, enforces annual testing for commercial properties. See our backflow testing service.
Also worth knowing
- Watering restrictions — towns and water suppliers can limit watering days, especially during drought declarations. Controllers should be programmed to follow them.
- Permits for new systems — new installs and backflow devices may need local plumbing permits.
Who does the work
Every job is performed by an NJ-certified, insured irrigation contractor. Certificates of insurance are available for vendor setup.
This page is general information, not legal advice. Rules can change — check with DCA, your town, and your water supplier.
Frequently asked questions
How do I verify an irrigation contractor in NJ?
Check DCA's published list of certified landscape irrigation contractors and valid business permits, or call (609) 984-7834.
Who enforces backflow testing?
Your water supplier and/or your town's plumbing or construction office, under the state plumbing code.