PG&E Substation
Solano County, CA
A remote utility substation with no sewer access, strict environmental requirements, and a workforce that needed a reliable, code-compliant wastewater solution — delivered with a fully traffic-rated commercial Hoot system buried out of sight beneath the working site.
PG&E’s Solano County substation sits well outside the reach of any municipal sewer system. Like many remote utility facilities, it requires a reliable on-site wastewater treatment solution that can handle daily use by operations and maintenance personnel — while meeting the environmental standards expected of a major utility operating in California.
The facility’s active working environment added a layer of complexity beyond a typical commercial installation. Every component of the system needed to be buried deep and rated for vehicle traffic — equipment, service trucks, and heavy machinery move across the site regularly. Nothing could obstruct the operational footprint of a functioning substation.
Superior On-Site Solutions designed and installed a three-tank commercial system, with every tank specified as deep-bury and traffic-rated — engineered to handle vehicle loads above without any surface disruption to the working site:
- Hoot H1000AND (1-Chamber) — Commercial advanced nitrogen denitrification treatment tank, deep-bury, traffic-rated. Delivers the highest available level of nitrogen reduction, exceeding EPA drinking water standards for total nitrogen.
- 2,500-Gallon Holding Tank — Deep-bury, traffic-rated. Provides effluent storage and timed dosing to the Geoflow dispersal system, ensuring consistent, even distribution regardless of daily flow variation.
- 2,500-Gallon Septic Tank — Deep-bury, traffic-rated. Pre-treatment stage that separates solids before the waste stream enters the Hoot treatment system.
Geoflow subsurface drip tubing was installed for effluent dispersal, routing clean treated water through underground lines with no above-ground components — keeping the surface clear and the system completely invisible at grade.
Our team coordinated every phase of the installation around PG&E’s active site operations. Site assessment began in September 2025, installation progressed through October, and the system was commissioned and signed off in December 2025. The deep-bury, traffic-rated design allowed the substation to remain fully operational throughout the construction process with no disruption to the facility’s function.
A fully compliant, invisible commercial wastewater system buried beneath an active utility substation — built to handle vehicle traffic above, advanced nitrogen reduction below, and decades of low-maintenance operation in between. Superior On-Site Solutions provides ongoing O&M service for the life of the system.
The H1000AND — Advanced Nitrogen Denitrification
The Hoot H1000AND is the commercial-scale version of Hoot’s highest-performing nitrogen reduction technology. It builds on the same proven aerobic treatment platform as the residential ANR series and adds advanced carbon-based denitrification — driving total nitrogen levels below the EPA’s 10 mg/L drinking water standard. For a utility operating near Solano County’s sensitive groundwater and agricultural areas, this level of treatment was the right specification.
High-efficiency aerobic treatment meets and exceeds Solano County’s discharge requirements.
Clear, odorless effluent dispersed through underground Geoflow tubing — invisible at the surface.
All three tanks are deep-bury and traffic-rated. This isn’t a standard commercial installation — it’s an engineered system designed to disappear completely beneath a working industrial site while delivering the highest available level of wastewater treatment above and below grade.
September Assessment Through December Completion
We Handle More Than Residential
The PG&E substation project represents the kind of complex, high-stakes commercial installation we take on regularly throughout California. When the system specification calls for deep-bury, traffic-rated tanks with advanced nitrogen denitrification at a working utility facility — that’s exactly the kind of project we’re built for.
From utility facilities and government buildings to wineries, schools, and remote commercial properties — the Hoot commercial system scales to meet any flow requirement and any site condition. Visit our Commercial & Municipal Hoot Systems page to learn more.
Commercial or Municipal Wastewater Challenge?
We design, deliver, install, and service commercial Hoot systems throughout California — including deep-bury, traffic-rated configurations for demanding industrial and utility environments.