Researchers say with proper management the treated wastewater can produce pleasing turf without harm to the aquifer. The researchers saw a slight increase in nitrates in the recharge zone, but levels fell well within drinking water requirements. The study also found manageable increases in salt and sodium in the soil. The two-year study involved 18 field plots. Irrigation included potable water and recycled water applied at rates to replace evapotranspiration, plus recycled water applied at 1.1 times the rate of ET.