Hastings, Stephanie Osler

Stephanie Hastings has played a leading role in several of California’s most complex and precedent-setting water matters. With 20 years of specialized expertise in water law, Stephanie brings a wealth of experience to the acquisition, maintenance, protection and management of water resources and water rights. Her practice spans every aspect of California and national water law. She represents the interests of all water users—wholesale and retail water providers, public and private corporations, government enterprises, agriculture and other large landowners, land developers and home builders, ski resorts and golf courses, investment funds and banks, traditional and renewable energy developers and high tech industries — in both transactional and litigation matters.

Stephanie helps clients acquire, develop, protect and monetize water supply assets and infrastructure. Her practice includes:

  • acquisition, development, maintenance and protection of surface and groundwater rights
  • complex water rights litigation and adjudications
  • developing long-term sustainable water supply portfolios for water providers
  • securing water supplies and water and wastewater utility  services for new development
  • development of recycled water supplies
  • reorganization of water and wastewater enterprises
  • conjunctive management of surface and groundwater supplies
  • water transfers and exchanges
  • construction and operation of water supply infrastructure
  • regulatory compliance and permitting for the exercise of water rights and the development and delivery of water supplies, including the drinking water, recycled water, and stormwater
  • compliance with state and federal water quality regulation, including the regulation of waste discharges and the irrigated lands management program
  • compliance with California and federal environmental quality regulation for water supply and infrastructure projects
  • California and federal species protection compliance for water supply operations and infrastructure projects

A longtime leader in the water community, Stephanie is a director of The Aquaya Institute, a nonprofit research and consulting organization dedicated to advancing public health by improving drinking water worldwide. Operating in Africa and other developing countries, Aquaya delivers the knowledge and tools that are required to deliver universal access to safe drinking water.

Stephanie is the Co-Founder and Co-Chair of the California H2O Women Conference.

Practices & Industries

Stephanie represents the interests of all water users in a variety of water supply, water right and environmental litigation matters, in both administrative and judicial venues, at trial and on appeal. In the surface water context, she has prosecuted numerous matters before the California State Water Resources Control Board and has represented water users in administrative proceedings and state court litigation involving the Kern River in Kern County, the San Juan Valley Basin in Orange County, the San Luis Rey Valley Basin in San Diego County, the Salinas River in San Luis Obispo and Monterey Counties, the Santa Ynez River in Santa Barbara County, and the Colorado River. Stephanie’s experience also includes representation of major stakeholders in many of California’s adjudicated groundwater basins, including the Beaumont, Central, Goleta, Main San Gabriel, Mojave, Santa Maria, San Fernando, Six and West Coast Basins, as well as numerous unadjudicated basins throughout the state. In federal court, she represented the interests of a lessee of tribal lands overlying the Coachella Valley Groundwater Basin.

Her published appellate decisions include:

  • Water Replenishment Dist. v. City of Cerritos (2012) 202 Cal.App.4th 1063 (review denied)
  • Hillside Memorial Park and Mortuary v. Golden State Water Co. (2011) 199 Cal.App.4th 658 (review denied)
  • City of Barstow v. Mojave Water Agency (2000) 23 Cal.4th 1224
  • Metropolitan Water Dist. of Southern California v. Imperial Irr. Dist. (2000) 80 Cal.App.4th 1403
Land & Resort Development

Stephanie regularly helps land developers (home builders and commercial developers such as golf and ski resorts) comply with Senate Bill 610/221 (California’s water supply planning statutes), as a component of the developer’s compliance with the California Environmental Quality Act. Notable projects include:

  • Water and environmental compliance counsel for a national land developer and home builder in support of a 1,000 home, age-restricted, mixed use community, including procurement of water and wastewater services from a regulated utility.
  • Water and environmental compliance counsel for a national land developer and home builder with respect to the water supply components of a 5,000 home residential and commercial development.
  • Water counsel for a national land developer in support of a project located within the jurisdiction of a water district that imposed a moratorium on all new service connections.
  • Water rights counsel for the acquisition and development of two major ski resorts.
Environmental & Endangered Species Compliance

Stephanie advises her clients in a number of related environmental and regulatory contexts as necessary to support water use and water supply businesses and operations. This includes assisting clients in their acquisition of permits and other approvals from state and federal regulatory agencies, together with the associated CEQA and NEPA compliance. She also has specialized expertise in state and federal Endangered Species Act compliance for aquatic species, including:

  • watercourse diversions and streambed alterations
  • take avoidance
  • incidental take authorization
  • habitat conservation planning
Representative Matters

Select Transactions

  • Representation of a joint powers authority with respect to the assignment of a State Water Project contract from the original county contractor to the joint powers authority, including the acquisition of numerous local and state approvals.

  • Representation of multiple groundwater stakeholders (agriculture and other private landowners, municipal providers, regulated utilities, water districts, and mutual water companies), in priority groundwater basins located around the state, with respect to implementation of the Sustainable Groundwater Management Act of 2014.

  • Special water rights counsel to a municipal water provider with respect to the licensing of surface water rights associated with two major reservoir projects.

  • Representation of a large coalition of agricultural associations, representing nearly all agricultural interests in the Salinas Valley of California, with respect to the formation of a “groundwater sustainability agency” pursuant to the Sustainable Groundwater Management Act of 2014 for the Salinas Valley Basin. Continuing representation of the successor entity which has secured seats on the new governing body.

  • Representation of all water supply and water quality components of a major agricultural entity’s operations.

  • Special water rights counsel to two major municipal water providers with respect to the environmental compliance and water right and water quality permitting requirements associated with the development and delivery of recycled water within and outside the boundaries of the recycled water provider.

  • Special water rights counsel to a city with respect to its investigation and consideration of numerous water and wastewater reorganization options, including annexation and sale of the utilities, which culminated in LACFO’s municipal service review. Continued representation of the city on all water right matters associated with the proposed annexation of the city’s water and wastewater systems, including negotiation of the transfer of all city water and wastewater assets and rights.

  • On behalf of a joint powers authority, negotiated, drafted and implemented nearly a dozen drought water transfers and exchange agreements to supplemented imported State Water Project deliveries during historic and extended drought in California. Program optimized use of existing water supply and delivery infrastructure.

  • Representation of a landowner in the sale of a spring water supply.

  • Water counsel for a national land developer in support of a project located within the jurisdiction of a water district that imposed a moratorium on all new service connections.

  • Water rights counsel to a senior water right holder on the Santa Ynez River. Representation includes maintenance and protection of the client’s numerous senior priority and permitted water rights, compliance with CEQA for the construction of an off-river reservoir, negotiations with competing users, and compliance with state and federal regulation of endangered species.

  • General counsel for the Central Coast Water Authority a joint powers authority comprised of eight member agencies and the wholesale water provider that delivers imported water to more than 80% of Santa Barbara County, and also to retail water suppliers in San Luis Obispo County. On behalf of the Central Coast Water Authority, Stephanie works to ensure Central Coast public water suppliers have all the tools they need to improve efficiencies, reduce costs and maximize beneficial use of their water supply portfolios.

  • On behalf of a national homebuilder, obtained approval of the Water Supply Assessment (SB 610) for development of a 1,500 acre-property in Southern California proposed to include 5,400 residential units and commercial uses. The project water supply included the use of imported water, surface water, groundwater, stormwater and recycled water supplies over a 30-year build-out. The project raised numerous water supply and water quality issues, including the production of groundwater from adjudicated and non-adjudicated basins, groundwater storage, conjunctive use, the delivery and use of imported State Water Project supplies, water re-use, flood protection and stormwater management.

  • Water rights counsel for the acquisition and development of two major ski resorts.

  • Buyer’s water rights and water supply counsel for the acquisition of Napa County vineyard.

  • Water rights counsel to a secured lender in bankruptcy proceeding to protect rights and interests in surface and groundwater rights and access to a long-term reliable water supply for the irrigation of a golf course.

  • Special water rights counsel to a wholesale water supplier with respect to the maintenance and protection of numerous water rights associated with the operation of ten major reservoirs.

  • Water rights counsel to a large mutual water company, including maintenance and protection of its rights in an adjudicated groundwater basin.

  • Counsel to one of California's largest wholesale water suppliers with respect to its compliance with the federal and state Endangered Species Acts for water supply and flood control operations in four major watersheds draining to the San Francisco Bay. The project included the development of a 50-year, multispecies habitat conservation plan (HCP) and associated implementation agreement and environmental compliance (CEQA and NEPA) documents; acquisition of incidental take permits from the NMFS, USFWS and the CDFG for approximately 25 covered terrestrial and aquatic species; and implementation of a complex, multi-agency settlement of a water rights complaint alleging violations of the public trust and CDFG Section 5937, including acquisition of the State Water Resources Control Board's approval of the settlement.

  • On behalf of San Diego County Water Authority, negotiated a series of complex agreements between state and federal agencies for the settlement of disputes related to the allocation of Colorado River water, including the largest water transfer in United States history, lining of the All-American Canal and water conveyance.

  • Successfully obtained the State of California’s approval of the largest agriculture to urban water transfer in the history of the United States, from Imperial Irrigation District to San Diego County Water Authority for up to 200,000 acre-feet per year for 75 years. The matter involved the negotiation of a series of complex agreements between state and federal agencies for the settlement of disputes related to California’s allocation of Colorado River water.

Selected Litigation and Administrative Proceedings

  • Defense of a municipal water provider in response to a water rights complaint filed with the State Water Board by a downstream water provider. The complaint raises numerous water right, water quality and environmental claims. The matter involves unique historical water rights dating back to the establishment of the missions in the mid-1700s.

  • Defense of a municipal water provider in complex litigation disputing the classification of a groundwater basin and the jurisdiction of the State Water Board.

  • Successfully defended and settled a complex quiet title action involving competing claims to water rights and access to numerous groundwater wells.

  • Successfully defended and settled complex and high stakes water rights litigation that threatened to enjoin a municipality’s groundwater production and operation of a $30 million groundwater treatment facility, which in turn would have forced the client to rely entirely on costly and less reliable imported supplies. The settlement implements a physical solution that protects the client’s water rights, permits continued operation of its facilities and substantially reduces the threat of future litigation.

  • Water litigation counsel in CEQA litigation challenging a city’s approval of a national land developer/home builder’s large residential and commercial development in southern California.

  • Water rights counsel for a resort and golf courses in the Coachella Valley leasing tribal lands in state and federal litigation involving the golf courses' use of groundwater, payment of groundwater replenishments to a local groundwater agency and exercise of Indian reserved water rights.

  • On behalf of an association of retail water providers in the West and Central groundwater basins, successfully obtained reversal in full of two separate, but related trial court decisions denying motions to amend judgments governing the West Coast and Central groundwater basins, which provide local water supplies to the millions of people living and working in the greater Los Angeles region. The motions had sought to provide for the conjunctive use and management of the basins, including procedures for use of the basins' available storage space. (Hillside Memorial Park and Mortuary v. Golden State Water Co. (2011) 199 Cal.App.4th 658 (review denied); Water Replenishment Dist. of Southern Cal. v. City of Cerritos (2012) 202 Cal.App.4th 1063 (review denied).)

  • Litigation counsel for an association of groundwater producers’ efforts to amend an existing adjudication to promote conjunctive use of the West Coast and Central groundwater basins, improve local self-sufficiency and increase overall water supply reliability for the millions of people living and working in the greater Los Angeles area.

  • Successfully defended a landowner's surface water diversions, including negotiation of a settlement with the California Department of Fish and Wildlife and the National Marine Fisheries Service regarding alleging violations of the state and federal Endangered Species Acts.

  • Representation of the cities of Burbank and Glendale in the context of a judgement adjudicating the rights of the parties in the Upper Los Angeles River Area, including successful implementation of an agreement to optimize management of the San Fernando Basin.

  • Trial counsel for one of California’s largest shareholder-owned public water suppliers in complex litigation to adjudicate and control the water resources in the Santa Maria groundwater basin. The case involved more than 1,000 parties who rely on local water resources and two federally-owned reservoirs. After eight years of litigation, the case was resolved through a settlement stipulation among the vast majority of the parties, thereby providing legal certainty with respect to the use and management of the resource.

  • Successful negotiation of multi-agency settlement of a water rights complaint alleging violations of the public trust and California Fish and Game Code section 5937, on behalf of one of California's largest wholesale water providers. The settlement provides a perpetual, multimillion-dollar program for the re-operation of numerous dams and associated water supply facilities on three watersheds, including flow enhancements, barrier removals and habitat restoration.

  • Amicus curiae on behalf of a regulated utility and groundwater user in City of Barstow v. Mojave Water Agency (2000) 23 Cal.4th 1224.

  • Representation of the San Diego County Water Authority in a validation action involving wheeling rates in Metropolitan Water Dist. of Southern California v. Imperial Irr. Dist. (2000) 80 Cal.App.4th.

News & Events
Publications & Presentations
California H2O Women Conference

Stephanie is co-founder and co-chair of the California H2O Women Conference. The inaugural event, which was hosted in Santa Barbara, California in January, 2017, was the first of its kind to showcase leading women professionals, their work and contributions to advancing the water industry. The first California H2O Women Conference provided a formal opportunity for 100 of the water industry's leading professionals to collaborate, coordinate, educate and support each other with the goal of empowering women to change the way we manage California’s and the world’s most important resource. The second California H2O Women Conference was held on November 1 and 2, 2018, at the Bacara Resort and Spa, in Santa Barbara, California.

  • J.D., 1996, University of California, Hastings College of Law
  • B.A., 1992, University of Vermont
  • 1988, St. Paul’s School, Concord, New Hampshire
  • California, 1996
  • U.S. District Court, Central District of California
  • U.S. Court of Appeals, Ninth Circuit

Best Lawyers in America, 2020-2021

Who’s Who in Energy & Environment, Pacific Coast Business Times, 2019

Who's Who in Professional Services, Pacific Coast Business Times, 2018

Best Lawyers in America, 2018-2020

Co-Chair, Natural Resources Department, 2009-12

Top Women in Business, Pacific Coast Business Times, 2012

Chambers USA, America’s Leading Business Lawyers, Environmental Law, 2009-2010

Top 40 Under 40, Pacific Coast Business Times, 2009

Water Practice Group Leader, 2005-09

Membership & Community

Director, The Aquaya Institute (2011-present)

Director, California Groundwater Resources Association (2004-2009)

Member, State Water Contractors, Legal Affairs Committee

Member, Groundwater Resources Association

Member, The Association of Women in Water, Energy, Environment

Member, Association of California Water Agencies