The Sustainable Groundwater Management Act
(SGMA) of 2014 requires local and regional agencies to
develop and implement Groundwater Sustainability Plans (GSPs).
These plans are detailed roadmaps for how groundwater basins will
reach long term sustainability to ensure these valuable resources
are available when we need them.
Groundwater from the Livermore Valley basin is used for
agricultural, municipal, industrial, domestic, and other supply
purposes. Supply wells are distributed throughout the basin with
the major municipal wells in the Main Basin.
Agricultural pumping has decreased significantly since 1974 when
imported surface water became available to many irrigation
customers. Municipal wells now account for most of the pumping.
Municipal pumping by retailers is contractually limited to a
groundwater pumping quota (GPQ).
Zone 7 pumps only groundwater that has been stored in the basin
as part of its artificial recharge program – which means we only
take out what we have put in. Zone 7 pumping is for municipal
purposes, salt management, demand peaks, and any shortage or
interruption in its surface water supply or treatment.
To keep track of basin conditions, we have the following
Groundwater quality including salt, nitrate, boron, chromium,
Land surface elevations
Streams program – Streamflow
Climatological program – Rainfall and evaporation
Land use – Water usage and source of water (recycled water,
Wastewater and recycled water use
Mining area activities
Zone 7 uses the results of these monitoring programs to perform
the following management actions:
In 2005, the Agency adopted a Groundwater Management Plan (GWMP),
which documented ongoing policies and programs for managing
groundwater to support existing and beneficial uses in the
valley. This was amended in June 2015 with the adoption of the
Nutrient Management Plan. Zone 7 also prepares annual reports of
the groundwater basin that summarizes the basin conditions over
the water year (from October to September).
Through these and other programs, Zone 7 has sustainably managed
the basin to avoid undesirable results for at least 21 years
since the 2005 adoption of the GWMP.
2022 Update to the Groundwater Sustainability Plan
The Department of Water Resources (DWR) has designated the Zone 7
Water Agency basin as a high- and medium-priority basin, where a
plan is due by January 31, 2022.
Zone 7 has compiled a grant application to prepare for the 2022