Reports & Studies


Pure Water Soquel Antidegradation Report

Pure Water Soquel Engineering Report


Final City of Santa Cruz Non-Potable Reuse Engineering Report (PDF)


2021 EIR Addendum

A second addendum was prepared for the 2018 PWS EIR. The 2021 Addendum summarizes the Project as considered in the Certified EIR and 2020 Addendum, describes additional treatment design changes made since the certification of the EIR and adoption of the 2020 Addendum, and analyzes any change in environmental effects associated with those changes. The Board of Directors approved the adoption of the addendum on October 5, 2021.



2020 EIR Addendum

An addendum was prepared  for 2018 PWS EIR. It describes the inclusion of an adjacent property next to the Chanticleer site and several refinements to the water treatment processes and facility layouts (referred to as Modified Project) and presents the updated environmental analysis performed on the Modified Project relative to the environmental impacts of the approved Project that were disclosed in the certified 2018 PWS EIR.  The Board of Directors approved the adoption of the addendum on November 17, 2020.


Mapping saltwater intrusion (PDF) with an airborne electromagnetic method in the offshore coastal environment, Monterey Bay, California by Stanford University and Ramboll


CEQA for the Pure Water Soquel Project

The California Environmental Quality Act (CEQA) requires state and local agencies to identify the significant effects a proposed project may have on the physical environment. View the historical record with dates of approvals noted and links to all pertinent documents. 

The Final EIR is comprised of the following three documents which include:

Board Resolutions

  • Resolution 18-30 Certifying the EIR (PDF)  (December 18, 2018)
  • Resolution 18-31 (PDF) Adopting the Environmental Findings with regard to the PWS Project EIR, Adopting a Statement of Overriding Considerations and a Mitigation and Monitoring and Reporting Program (MMRP) and Approving the Project (December 18, 2018)

Community Handbook & Press Release



Independent Advisory Panel

The District commissioned a third party, independent advisory panel through the national Water Research Institute.

Feasibility Study

The District prepared a Feasibility Study is to determine the feasibility of developing an indirect potable reuse (IPR) project. The objective of the study was to evaluate the development of an IPR project within the Soquel Creek Water District (SqCWD) area that would facilitate the restoration of the overdrafted local groundwater basin and provide protection against seawater intrusion 

Other Technical Studies and Reports 


Potential Injection Aquifer Geochemical Characterization Report (PDF)
Author/Consultant: Brown and Caldwell
Injection of purified water into a groundwater aquifer can lead to geochemical reactions such as mineral dissolution, oxidation, or desorption. The potential for oxidation or mineral dissolution to occur can be mitigated through purified water post-treatment stabilization prior to injection. Geochemical characterization of potential aquifer soils in the injection area can provide the data needed for geochemical modeling and to design an effective water purification process. The geochemical characterization work summarized herein includes conducting soil leaching analysis under "worst-case" scenario conditions to establish a baseline if post-treatment stabilization was not carried out on the purified water. Understanding the baseline, worst-case scenario can aid in establishing and optimizing the post-treatment stabilization regime for the target groundwater aquifer. 

Project Memorandum on Nanoparticle Concerns (February 2016) (PDF). This memorandum was drafted in response to a specific request from the Soquel Creek Water District (SqCWD) regarding nanoparticles. The SqCWD wanted to know the latest information on nanoparticles as they pertain to potable water reuse projects. Nanoparticles are not regulated for potable water reuse projects (or potable water projects, for that matter). In conversations with the State of California Division of Drinking Water (DDW) in January 2016, the DDW defined their position on nanoparticles, which is that existing regulations are protective of public health and that there is no intent to regulate nanoparticles. With that said, DDW will continue to evaluate the issue.


CEC Removal Through Advanced Treatment

At the Board's October 20, 2015 meeting, Andy Salveson from Carollo Engineers, presented the following:

  • A technical memo that included a comprehensive literature review
  • Data from several existing facilities currently using AWP
  • Comparisons between recycled water, surface water, and our own District groundwater in terms of CEC levels
  • Detailed testimonials regarding his own personal experiences with looking for endocrine disrupters, pathogens, viruses, and other potential contaminants in recycled water during his 19 years working in the field