Pinnacles National Park Case Study

Pinnacles National Park, located in central California, is renowned for its striking spires, canyons, and as a refuge for the endangered California Condor. Protecting the pristine landscape and delicate ecosystems is a top priority, especially when it comes to wastewater treatment. When the park sought a sustainable solution to meet nitrogen reduction goals, the Eljen Geotextile Sand Filter (GSF) was selected and installed in its nitrogen reduction configuration.

The site’s conditions, low groundwater, rocky terrain, and a high-value natural habitat—made Pinnacles an ideal candidate for the GSF’s passive denitrification capabilities. Unlike mechanical treatment systems, the GSF requires minimal maintenance and no power, which reduces operating costs and environmental impact. The layered geotextile and sand filtration process ensures advanced treatment, significantly lowering nitrogen, BOD, and TSS levels while protecting surrounding water resources.

Since its installation, the GSF has provided reliable performance with a small footprint, aligning with the National Park Service’s mission to conserve natural resources for future generations. This project illustrates how innovative, low-maintenance technologies like the GSF can serve sensitive sites where both performance and sustainability are critical. By helping Pinnacles safeguard water quality while reducing operational demands, the GSF stands as a model for wastewater treatment in national parks and beyond.