Many experts believe the geology of the area does not favor recharge of the Central Wellfield. From the data already gathered, they predict the water will flow to the northwest rather than the south, which is where the wellfield lies. The recharge capacity of the Rillito appears quite limited. Because we can see water in the Rillito and other rivers disappear as it flows downstream, we know this water is recharging the aquifer. The aquifer lies well below the surface of the ground.
Geologists say the water enters the aquifer soils more slowly than the surface soils.
Putting too much water in the Rillito will only cause the water to flow out of the basin and be lost to the area. Using treated wastewater for recharge projects is not a good idea. Reclaimed water is unsafe for playgrounds and other places children use. Reclaimed water must meet state health standards for reuse, and it is safe when proper treatment and application are maintained. Reclaimed water has been used for many years in this community with no known ill-effects.