Irrigation System Efficiency Audit in Surprise, Arizona

An irrigation audit in Surprise has a local benchmark. The city's conservation program sponsors QWEL, a training course built to EPA WaterSense professional standards for landscape irrigation system audits, and publishes its own watering table to measure a yard against.

Why outdoor water is the target

The City of Surprise Water Conservation page notes that up to 70 percent of residential water use in the Phoenix metropolitan area happens outdoors, and the city's HOA resources say landscape irrigation accounts for 90 percent or more of common-area water use in many associations, with timer adjustment named as one of the easiest savings. An audit measures how much of that water reaches roots. It runs each station, records what the heads and emitters actually deliver, looks for runoff and overspray, and compares the controller program with the plants on each zone. The city's QWEL course, described on the same page, covers soils, irrigation systems and auditing, maintenance and troubleshooting, controllers and scheduling, and includes a hands-on audit, which is a reasonable outline of what a thorough audit should look at.

Owners can also learn the basics before or after an audit. The city lists water-wise workshops, including Irrigation Efficiency and Irrigation Maintenance, Troubleshooting and Repair, and University of Arizona Master Gardeners hold office hours on Saturdays from 9 a.m. to noon at the Water Education Center beside the Xeriscape Demonstration Garden on the City Hall campus. Bringing audit findings to those sessions is one way to decide which changes an owner can make and which need a repair visit.

The yardsticks a Surprise audit uses

The Surprise Landscape Watering Guidelines supply the targets: days between waterings for each plant type across four periods of the year, and depths of 24 to 36 inches for trees, 18 to 24 inches for shrubs, 8 to 12 inches for groundcovers and cacti, and 6 to 10 inches for grass. University of Arizona Extension publication AZ1048 suggests checking depth with a soil probe or long screwdriver and describes the root zone as one and a half to four times the canopy width. The audit compares the yard with those numbers. The city's water conservation code supplies the other test: water that sprays or runs onto sidewalks, streets or a neighbor's lot, or ponds on paving, meets the city's definition of water waste.

Data and the water provider

Surprise has eleven water providers, so begin with My Surprise Address. City of Surprise customers can review usage and set leak alerts in the WaterSmart portal, and the city's Advanced Water Meter Project is replacing about 16,000 mechanical meters with automated ones. A usage pattern from those tools is a strong starting point for an audit. City supply is groundwater from 19 wells in the West Salt River Valley sub-basin. Check Surprise's current drought notices for the active stage and any watering-hour limits. An older Stage 1 notice does not establish current restrictions. An audit that finds leaks should hand off to repair, because Section 58-803 of the city code asks repairs to begin no later than 72 hours after the owner learns of a leak. The general method is on the efficiency audit service page. The Surprise water use check guide explains reading the bill and portal. Rebate-eligible upgrades are on smart controllers in Surprise and sprinkler head replacement in Surprise. Every service is listed on the Surprise hub. Your provider decides which usage tools you have; see who supplies your water in Surprise.