Water reuse has become an integral component of water management by utilities due to both its benefits and impacts on water supply, use, storage, treatment and distribution. With more than 100 years of expertise in global water planning, MWH, now part of Stantec, has extensive experience integrating surface water, groundwater, conjunctive use, water conservation, water reuse and recycling strategies for both local and regional water management plans. In the past 10 years, we have delivered more than 250 water resource planning projects worldwide. We have a proven track record in distribution system analysis; network modeling; facility planning; water treatment analysis and planning; adaptive plan development; application of emerging technologies to water utilities; and gaining regulatory approval.

Tapia Water Reclamation Facility Water Management Guidance, Las Virgenes Municipal Water District, California, USA

MWH, now part of Stantec, completed a guidance paper showcasing a case study in water reuse facility planning where novel stakeholder engagement techniques were used to overcome obstacles and achieve consensus on project alternatives. MWH collaborated with Las Virgenes Municipal Water District (LVMWD) and their Joint Power Authority (JPA) to assess seasonal imbalance of the Tapia Water Reclamation Facility (TWRF), which currently produces roughly 6.5 mgd of California’s Title 22 recycled water. However, only 60% of that available water is beneficially reused due to seasonal demand fluctuations, while the rest is discharged to Malibu Creek. Increasing regulatory requirements have made this discharge practice untenable, so MWH worked with LVMWD to execute a facilitation process amongst the agency staff and key stakeholders in the area. From various proposed project alternatives, two were selected for further investigation, and a preferred alternative was selected for advanced treatment and surface water augmentation. The findings of these efforts, including strategies within recycled water planning and integration, were presented in the final report, which will help both increase the beneficial use of TWRF recycled water and exemplify solutions to communities with similar challenges.

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