Wawona Wastewater Treatment System Rehabilitation

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Documents, Meetings, and Comment Information

Public Scoping Comment Period Ended May 17, 2017.
Wawona Wastewater Treatment Facility
This project aims to rehabilitate the 30 year old wastewater treatment facility and connect the Wawona Campground to the facility. The park has conducted a facility assessment which identified specific items and recommended improvements to ensure that the plant would comply with future permit regulations, address deferred maintenance, and improve reliability and inefficiencies.

This project has three components. The first component upgrades the plant’s infrastructure in collaboration with the California Regional Water Quality Control Board. To do so, the project will address the following:

  • Install new plant automation systems
  • Provide the capability to adapt to high summer and low winter flows
  • Increase capacity to accept additional flow from visitor facilities with failing leach fields, unserved parcels in the community currently served by septic systems, and future services on currently undeveloped parcels (ultimate buildout)
  • Install solids handling by constructing on-site dewatering equipment in a new building within the plant’s footprint
  • Investigate an alternative secondary effluent disposal system, and
  • Repair treatment system facilities to address deferred maintenance and improve efficiencies.
The second component calls for connecting the Wawona Campground to the Wawona Wastewater Treatment Plant. Actions include:

  • Replacing the saturated and failing Wawona Campground restroom sewage disposal system
  • Installing three lift stations (two in the campground and one at the campground entrance in the Wawona Road corridor) and a force main connecting the campground to the Wawona sewer collection system by way of the central lift station, and
  • Installing a 10 feet by 14 feet pump house near the central lift station at the corner of Wawona Road and Chilnualna Road.
The third component of the project (if funding allows) would remove the single-stall vault toilet at the South Fork Picnic area and replace it with a flushing toilet facility and tie it in to the new sewer at Wawona Campground.

Last updated: June 26, 2017

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PO Box 577
Yosemite National Park, CA 95389


(209) 372-0200

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