Mariposa Portable Santitation LLC

Mariposa Portable Sanitation LLC, a small business partnership based in El Portal, California, operates exclusively as a prime contractor delivering portable toilet and handwash station rentals with comprehensive maintenance and servicing to the National Park Service Pacific West Region. The vendor competes under total small business set-asides on its underlying Indefinite Delivery/Indefinite Quantity vehicle and holds NAICS 562991 (Septic Tank and Related Services) designations across its award portfolio.

Mariposa's federal footprint is narrowly concentrated on a single customer and a single mission. The Department of the Interior's National Park Service Pacific West Region accounts for 185 of 189 awards (99% of awards, $8.3 million combined potential value), with all work focused on Yosemite National Park. A small secondary engagement with the Department of the Interior's Bureau of Land Management California Region spans three awards valued at $77 thousand. The vendor has no subcontract work; 100% of its federal activity is prime.

The vendor's capability set is specialized and concrete: portable sanitation equipment rentals—toilets and handwash stations—paired with on-site maintenance and servicing operations at multiple Yosemite locations including Happy Isles, Chinquapin, White Wolf Campground, Foresta, Crane Flat, Wawona, and Arch Rock. Servicing frequencies range from standard schedules to intensive five-times-weekly operations during peak visitor periods. Representative work includes a $145,356 delivery order (May 2023) for portable toilet rentals and servicing across multiple Yosemite locations, a $112,052 delivery order (May 2023) for White Wolf Campground, and a $82,166.85 delivery order (December 2025) for Chinquapin operations.

Mariposa's prime vehicle position rests on four Indefinite Delivery Contracts held with the National Park Service Pacific West Region. The largest and most active is Indefinite Delivery Contract 140P8523D0002—a $2 million single-award, total-small-business set-aside awarded April 6, 2023, with expiration April 30, 2027—which anchors 77 task orders worth $1.9 million combined potential value. A second major vehicle is Indefinite Delivery Contract 140P8520D0005, a $1 million award providing 49 task orders worth $987 thousand. These vehicles enable the National Park Service to issue firm-fixed-price delivery orders on an as-needed basis to meet seasonal demand and emergency sanitation requirements. Individual delivery orders have ranged from $1,200 to $145,356.

Activity has remained flat to modestly declining year over year—20 awards in 2022, 23 in 2023, 28 in 2024, 21 in 2025, and 16 through mid-2026—suggesting a mature, stable customer relationship with seasonal fluctuation rather than growth trajectory. The vendor's registration in SAM.gov dates to March 2005, establishing a twenty-one-year track record with the National Park Service. Only four awards (combined potential value $184 thousand) face ultimate completion dates within the next twenty-four months, indicating minimal near-term recompete exposure on its core portfolio.

Mariposa competes exclusively in the portable sanitation equipment rental and maintenance space with zero diversification into other federal service lines or customer agencies. Customer concentration is extreme: nearly all federal dollars flow from a single National Park Service regional office managing a single national park. This positioning makes the vendor heavily dependent on NPS's Yosemite operational priorities and the renewal of the $2 million IDIQ vehicle in 2027.