Documents and Downloads

Below are Documents, Downloads and Links that may be of interest as the Soquel Creek Water District continues to explore the possibilities of Advanced Water Purification technologies.

Technical Memorandums and Presentations on CECs

Project Memorandums on Nanoparticle Concerns

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 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; and 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.

As part of the Carollo Feasibility Study, a follow up Technical Memorahum was prepared to investigate CECs which included sampling of the SC WWTF secondary effluent.

Enrichment Series Meeting: Purified Recycled Water: Why Now?
June 17, 2015
A community meeting, co-sponsored by the Soquel Creek Water District, the City of Santa Cruz, and the Water Supply Advisory Committee was held on June 17 that  invited community members to hear who is using purified recycled water, how it's being use, and how we can be sure it's safe. Presenters included Bob Hulquist (State Water Resouces Control Board), Bruce Macler (US EPA), and Brian Good (Denver Water).

  • For meeting materials, click here.

District in the News

Santa Cruz Sentinel Commentary
September 7, 2015
In a special commentary to the Santa Cruz Sentinel Newspaper, President Bruce Daniels and Vice President Tom LaHue discuss how Soquel Creek Water District is pursuing a supplemental water supply to help replenish the groundwater supply and stop seawater intrusion from moving more inland.  In 2015, the district took actions to keep all three options moving forward, but purified recycled water stands out in three categories identified as important by our customers in a recent survey: timeliness, reliability, and water quality.

Reports and Studies

NRC. Water Reuse: Potential for Expanding the Nation’s Water Supply through Reuse of Municipal Wastewater.
2012
Expanding water reuse--the use of treated wastewater for beneficial purposes including irrigation, industrial uses, and drinking water augmentation--could significantly increase the nation's total available water resources. Water Reuse presents a portfolio of treatment options available to mitigate water quality issues in reclaimed water along with new analysis suggesting that the risk of exposure to certain microbial and chemical contaminants from drinking reclaimed water does not appear to be any higher than the risk experienced in at least some current drinking water treatment systems, and may be orders of magnitude lower. This report recommends adjustments to the federal regulatory framework that could enhance public health protection for both planned and unplanned (or de facto) reuse and increase public confidence in water reuse.

Framework for Direct Potable Reuse
September 10, 2015

A framework white paper document developed through a collaborative effort between WateReuse, the American Water Works Association and the Water Environment Federation through an independent advisory panel administered by the National Water Research Institute. The framework provides information about the value of direct potable reuse (DPR) as a water supply option. While SqCWD is not considering DPR, we are including this document as it contains useful information about potable reuse in general.