Groundwater Sustainability
Groundwater Sustainability
The Sustainabile Groundwater Management Act (SGMA) requires formation of local agencies to devleop new plans, called Groundwater Sustainability Plans (GSPs), to address and prevent problems in groudnwater basins in most areas of the state. The Salinas Valley Groundwater Basin is included in this new regualtory process, and the formation of the Salinas Valley Basin Groundwater Sustainability Agency was completed in March 2017.
GSP implementation, now in process for the all sub-basins, will be a balancing act of different interests, between water supply and water demand, and among beneficial uses. The GSP describes the (sub)basin, setting of a water budget, groundwater management standards and objectives, and identifies actions and projects to meet those standards and objectives, with a monitoring program to measure success.
Download a primer brochure on SGMA, understanding the law, and important terms to know here.
All groundwater sustainability plans for the Salinas Valley Groundwater Basin have been approved by CA Department of Water Resources; sub-basin plans cover the 180/400 (Pressure), Eastside, Langley, Forebay, Upper Valley and Corral de Tierra area of the Monterey sub-basin.
California’s Department of Water Resources oversees the groundwater sustainability efforts and has produced “DWR’s Assistance Role in Groundwater Management” showing how new technology will aid in managing water resources in the coming decade.
Source: Groundwater Extraction Summary Report – Water Year 2025 (Monterey County Water Resources Agency)
Historical Perspective of Groundwater Sustainability Act
In late summer 2014, the Legislature passed and Governor signed new regulatory mandates for the management of groundwater basins around California. Combining three legislative bills now known as the Sustainable Groundwater Management Act (SGMA), a number of new requirements are to be placed on groundwater basins currently in overdraft.
While this may be the most sweeping water management legislation since 1913, SGMA is the result of many attmepts over the past decade to regulate groundwater extractions in California.
There are many factors that came into play while this groundwater legislation was crafted and considerted by the legislature: specific areas of California have well-documented declines in groundwater basin levels due to extraction pumping; reoccuring drought conditions heighten sensitivity to groundwater pumiping issues; and, California remained the only western state without significant groundwater use regulations.
Groundwater basins around California (approx. 600+) have been prioritized for risk to decreasing water levels due to extractions; Monterey County has at one groundwater sub-basin that appears on official maps as high priority overdraft basins (not including those basins already adjudicated).
The emphasis of SGMA is on local management to “sustainably manage groundwater.” To accomplish this, local groundwater management agencies will be given new authorities to develop and implement a Groundwater Sustainability Plan (GSP). Monterey County Water Resources Agency has indicated that, by a vote of their Board of Directors in October 2014, this agency should be designated by the Supervisors as the Groundwater Sustainability Agency (GSA) for Monterey County. Ultimately, the Supervisors approved the formation of a new agency as a joint-powers authority, including MCWRA and the County, known as the Salinas Valley Basin Groundwater Sustainability Agency (SVBGSA).
In areas where groundwater overdraft currently exists, GSAs will face strict deadlines to approve and implement sustainable groundwater management plans that can lead to limiting of groundwater extractions, as well as impose fees to pay for overdraft solutions (i.e. new projects).
Groundwater basins ranked as medium or high priority must adopt and implement a GSP by 2020. California’s Department of Water Resources (DWR) issued the final priority rankings on January 31, 2015, at which time Monterey County was included to meet the 2020 deadline for GSP development.
The new requirements for adoption of a GSP will initially apply to over 100 basins areas around the state (2020 deadline). This would encompass thousands of landowners, public water supplies, county and regional agencies, private water companies, municipalities, and other stakeholders across the State.
The new regulatory requirements do not apply to groundwater basins that have already been adjudicated and a court retains continuing jurisdiction to manage the basin through a watermaster.
Groundwater users in overdraft basins had until June 2017 designate their GSA and then to prepare and submit the GSP three years later. The designated agency must have water supply, water management or land use responsibility within its basin area; a combination of agencies could also be designated for this responsibility through a joint powers agreement.
Sustainability plans need to have an overall 50-year time line with five-year milestones towards achieving groundwater basin sustainability within 20 years of initial implementation. Establishment of safe yield will be based on the volume of groundwater that can be extracted without causing long-term impacts, such as salt water intrusion, chronic lowering of groundwater levels, degradation of water quality, unreasonable impairment of surface water flows, and land subsidence. Sustainability plans will be exempt from CEQA review (same as urban water management plans). The implementation of a sustainability plan may include well registration, mandatory measurement devices, well spacing requirements, pumping reports, inspections, additional fees to well owners, and power to regulate pumping and limits on pumping. Land fallowing and repurposing may also be part of the implmentation process.
If a sustainability plan fails to achieve the desired results (or a GSP is not adopted within the time frame specified and formally approved), the State Water Resources Control Board is authorized to step in and impose an interim sustainability plan, a potential for direct state regulatory control of a local groundwater basin. The “probationary” designation has already occurred in one basin the San Joaquin Valley, with five more pending.
SGMA contains clear statements that surface and groundwater rights are to be respected and that the act does not determine or alter water rights. Groundwater and surface water interactions are likely to be issues with significant uncertainty and conflict; groundwater extractions impacting surface water flows are considered “groundwater-dependent ecosystems” leading to possible groundwater use curtailments for envrionmental benefits.
Costs of GSP development could become highly technical and compliacted, leading to overspending on SGMA compliance without significant benefits to groundwater basins.
Deadlines for Implementation
1/31/2015 – CASGEM reprioritization of groundwater basins by DWR
1/1/2016 – DWR to adopt regulations related to basin boundary adjustments
6/1/2016 – Regulations for evaluating groundwater sustainability plans adopted by DWR
12/31/2016 – Estimate of water available for groundwater replenishment reported by DWR
1/1/2017 – Updated list of basins with critical conditions of overdraft due from DWR
6/30/2017 – Local groundwater sustainability agency designated – completed
1/31/2020 – High and medium priority basis must be managed under groundwater sustainability plan (180/400 sub-basin of Salinas Valley Groundwater Basin)
1/31/2022 – Other sub-basins must be managed under groundwater sustainability plans
1/31/2025 – Five-year groundwater sustainability plan update due on 180/400 (Pressure) sub-basin; if plan is determined to be deficient, basin may be placed on probation by DWR
1/31/2027 – Five-year groundwater sustainability plan updates due on all other sub-basins, plus update on 180/400 to align all six sub-basin plans into same reporting cycles; if plan is determined to be deficient, basin may be placed on probation by DWR
Resources for state-wide water issues:
Salinas Valley Basin Groundwater Sustainability Agency
California Department of Water Resources
Pacific Institute Report on Water Conservation